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Security
On its face, SELinux offers a number of attractive capabilities. It
enables a Linux system to be partitioned into lots of little realms
("domains" or "types") with fine-grained control over the capabilities of
each realm. For example, the named DNS server can be empowered to bind to the
DNS ports (but no others), write to its log and cache files (but no
others), and read from its configuration files (but from nowhere else). It
can read random numbers, but cannot access any other device files. And so
on. The end result is that, even if named falls to a remote code exploit,
there is very little that exploit can actually do. A vulnerability which,
on a current Linux system, could lead to a full system compromise is
limited to a denial of service problem, or, at worst, the provision of
bogus DNS information.
This promise is worth something. Currently, any sort of compromise of any
daemon on the system has a good chance of being escalated to full control
of the system itself. SELinux cannot prevent security holes in server
processes, but it does have the potential to strictly limit the damage
which can be done by exploiting those holes. SELinux could be the
mechanism which turns Linux into the most secure widely-used operating
system on the planet.
The only problem is that getting there could be a challenge, and, along the
way, we risk turning Linux into a system we no longer wish to use.
Like all good kernel code, SELinux does not, itself, contain a security
policy. That policy, instead, is defined by the system administrator and
loaded from user space. Defining that policy, however, is not the
easiest thing to do. The book SELinux: NSA's Open Source Security
Enhanced Linux, just reviewed by LWN,
notes that a typical set of policy files contains some 250,000 lines of
code. More to the point:
The SELinux source policy is a sophisticated software system. It
includes dozens of object classes, scores of defined permissions,
more than 1,000 type transitions, thousands of object instances,
and tens of thousands of access-vector rules.
As an aside, all of this code is written in a language which, as of this
writing, probably has no more than a few dozen expert authors. So a couple
of questions come immediately to mind: how is it possible for anybody to
truly understand a system's security policy, and how can that policy be
shown to be correct? Complexity and obscurity are enemies of security, and
SELinux has large amounts of both.
There are complications. Installing a new program on a full-blown SELinux
system required updating the security policy. There has been talk of a day
when applications are routinely shipped with SELinux policy files, just
like they currently contain makefiles. But that talk assumes that large
numbers of application developers will learn the SELinux policy language
well enough to write a secure policy for their code. It assumes that
system administrators will understand those files well enough to decide
whether they are safe to install. In an SELinux world, malicious policy
files may become a required part of any self-respecting trojan horse;
vigilance will be required.
Perhaps the biggest problem, though, is the assumption that a single policy
file will fit into the security policies running on systems worldwide. If
everybody ends up with a single, uniform security policy derived from the
SELinux sample policy, that assumption might hold. But how can a single
security policy make sense for all situations? The sheer difficulty of
creating a radically different policy will likely keep experimentation to a
minimum, but there will inevitably be pressure for different policies for
different situations. In the future, we may see new offshoot distributions
which differ mainly in their SELinux policies. Divergent security policies
will be good for user choice, and the diversity may be good for the
security of the net in general. But they will make it hard to write a
portable application policy file.
SELinux depends on "labels" applied to almost all files on the system.
Those labels define the type(s) of the files, and, thus, who can access
them, and in which way. These labels are also a crucial part of the domain
system which allows the isolation of specific daemons and utilities.
Maintaining the integrity of these labels proves to be a challenge,
however. Consider this warning from the SELinux book:
If you use vipw, vi, or some other means to
modify /etc/passwd, /etc/group, or
/etc/shadow, you'll likely remove the security context
labeling [from] the file, which will make the file inaccessible.
Relabeling files is something every SELinux administrator needs to know how
to do. The Fedora boot process checks for labeling problems, and, when
they are found, it automatically relabels things. Relabeling is a fact of
life in the SELinux world.
It turns out that the proper labels are stored in the SELinux
policy; what's on the files themselves can be thought of as a sort of
cached version. In other words, SELinux has imposed a new file permissions
scheme which is maintained outside of the kernel. If the files are
manipulated by non-aware applications, or by way of a non-SELinux kernel,
those permissions will become unsynchronized. Applications installed by
the administrator will have labeling problems of their own.
The end result is that SELinux could lead to systems which are too complex
to administer, which have a single security policy created by the
distributor, and which are highly resistant to the installation of software
not provided by the distributor - or to changes in general. That is not a
world which most of us would
like to live in; we should think carefully before we run too quickly in
that direction.
Of course, that is a worst case scenario, and the Linux community is
unlikely to let things get that bad. Some steps have already been taken in
the right direction. The Fedora Project's decision to fall back to a
"targeted" mode, where SELinux only applies to certain system daemons, is a
good start. The targeted mode reduces the complexity of the security
policy and makes experimentation easier. Fedora has also introduced
"policy booleans" to the mix. These booleans are runtime variables which
provide (relatively) high-level control over the system's security policy.
Booleans in Fedora Core 3 control whether Apache can run CGI programs
or read home directories, whether yellow pages can be used, and more.
The booleans point in an important direction. Perhaps part of the real
problem with SELinux is that policies must be written in the equivalent of
assembly language. Most programmers do not want to worry about individual
register assignments, and most system administrators would rather not deal
with domain transitions and access vectors. If, in some future day, a
system's security policy can be specified with, at most, a few hundred
lines of high-level declarations, that policy may just be manageable. If
that can be done, SELinux might just be the answer to a lot of our security
worries.
(See also: this
just-released, beta Fedora document which describes what is involved in
using SELinux to control Apache).
Comments (20 posted)
Brief items
The EFF has put out a a lengthy
document describing its concerns with contemporary spam filtering
techniques. " Blind keyword or phrase blocking is the determination
that messages will not be delivered because they contain specific words or
phrases. This method is imprecise and unnecessary, especially now that
more sophisticated tools are available. Moreover, it can be used to block
messages for political reasons. In short, there's no defensible reason to
label email as spam based solely on keywords or phrases."
Comments (1 posted)
Visitors to freedesktop.org will see
a message noting that the site was compromised on November 15. The
project does not believe that any code on the site was tampered with, but
they are rebuilding everything from the beginning anyway. More info will
come as we get it. (Thanks to Thomas Kirby).
Comments (20 posted)
New vulnerabilities
BNC: Buffer overflow vulnerability
| Package(s): | bnc |
CVE #(s): | |
| Created: | November 16, 2004 |
Updated: | December 1, 2004 |
| Description: |
Leon Juranic discovered that BNC fails to do proper bounds checking
when checking server response. An attacker could exploit this to cause a
Denial of Service and potentially execute arbitrary code with the
permissions of the user running BNC. |
| Alerts: |
|
Comments (none posted)
bogofilter: denial of service
| Package(s): | bogofilter |
CVE #(s): | CAN-2004-1007
|
| Created: | November 17, 2004 |
Updated: | November 17, 2004 |
| Description: |
Bogofilter has a vulnerability in its quoted-printable processing code which may be exploited to crash the process. |
| Alerts: |
|
Comments (none posted)
ez-ipupdate: format string vulnerability
| Package(s): | ez-ipupdate |
CVE #(s): | CAN-2004-0980
|
| Created: | November 11, 2004 |
Updated: | November 17, 2004 |
| Description: |
ez-ipupdate, a dynamic DNS file updating utility, has a
format string vulnerability that can lead to the
execution of arbitrary code. |
| Alerts: |
|
Comments (none posted)
openssl: der_chop script temp file vulnerability
| Package(s): | openssl |
CVE #(s): | CAN-2004-0975
|
| Created: | November 11, 2004 |
Updated: | July 19, 2005 |
| Description: |
The der_chop script in openssl has a temp file vulnerability that may allow
an attacker to overwrite arbitrary files with the permissions that
the script is running under. |
| Alerts: |
|
Comments (1 posted)
SquirrelMail: cross-site scripting
| Package(s): | squirrelmail |
CVE #(s): | CAN-2004-1036
|
| Created: | November 17, 2004 |
Updated: | December 23, 2004 |
| Description: |
Squirrelmail (through version 1.4.3a-r2) suffers from yet another cross-site scripting vulnerability. |
| Alerts: |
|
Comments (none posted)
sudo: environment variable sanitizing
| Package(s): | sudo |
CVE #(s): | CAN-2004-1051
|
| Created: | November 17, 2004 |
Updated: | May 15, 2005 |
| Description: |
Versions of sudo prior to 1.6.8p2 fail to properly sanitize the environment prior to running shell scripts; this failure can be exploited by a sudo user to subvert scripts and obtain shell access. See the 1.6.8p2 announcement for more information. |
| Alerts: |
|
Comments (none posted)
unarj: buffer overflow vulnerability
| Package(s): | unarj |
CVE #(s): | CAN-2004-0947
|
| Created: | November 11, 2004 |
Updated: | February 2, 2005 |
| Description: |
The unarj uncompression utility has a buffer overflow vulnerability
from handling long file names in an archive. An attacker can
cause unarj to crash or execute arbitrary code. |
| Alerts: |
|
Comments (none posted)
Updated vulnerabilities
apache: arbitrary code execution
| Package(s): | apache |
CVE #(s): | CAN-2004-0940
|
| Created: | October 29, 2004 |
Updated: | December 14, 2004 |
| Description: |
According to an Apache
announcement, a vulnerability exists in the Apache HTTP server, version
1.3. The problem is a potential buffer overflow in the "get_tag" function
of Apache's SSI module "mod_include". It allows local users who can create
SSI documents to execute arbitrary code as the Apache run-time user via SSI
documents that trigger a content length calculation error. |
| Alerts: |
|
Comments (none posted)
apache2: denial of service
| Package(s): | apache |
CVE #(s): | CAN-2004-0942
|
| Created: | November 10, 2004 |
Updated: | November 26, 2004 |
| Description: |
Versions of Apache 2.0 prior to 2.0.53 contain a bug in the header
parsing code which can allow a remote denial of service attack given
sufficient bandwidth. |
| Alerts: |
|
Comments (none posted)
aspell: bounds checking problem
| Package(s): | aspell |
CVE #(s): | CAN-2004-0548
|
| Created: | June 17, 2004 |
Updated: | December 20, 2004 |
| Description: |
Aspell's word-list-compress utility fails to properly check bounds
when dealing with words that are more than 256 bytes long.
This can lead to arbitrary code execution by an attacker. |
| Alerts: |
|
Comments (none posted)
cdrecord: failure to drop privilege
| Package(s): | cdrecord |
CVE #(s): | CAN-2004-0806
|
| Created: | September 8, 2004 |
Updated: | February 21, 2005 |
| Description: |
The cdrecord utility, which is installed setuid on some distributions, fails to drop privilege before running a user-specified program. |
| Alerts: |
|
Comments (none posted)
ncompress: Buffer overflow
| Package(s): | compress uncompress ncompress |
CVE #(s): | CAN-2001-1413
|
| Created: | October 11, 2004 |
Updated: | December 14, 2004 |
| Description: |
compress and uncompress do not properly check bounds on command line
options, including the filename. Large parameters would trigger a buffer
overflow. By supplying a carefully crafted filename or other option, an
attacker could execute arbitrary code on the system. A local attacker could
only execute code with his own rights, but since compress and uncompress
are called by various daemon programs, this might also allow a remote
attacker to execute code with the rights of the daemon making use of
ncompress. |
| Alerts: |
|
Comments (none posted)
cyrus-sasl: remote buffer overflow
| Package(s): | cyrus-sasl |
CVE #(s): | CAN-2004-0884
|
| Created: | October 7, 2004 |
Updated: | March 16, 2005 |
| Description: |
cyrus-sasl has a vulnerability involving a buffer overflow
in the digestmda5.c file. A remote attacker may be able
to compromise the system. Also, a local user may be able to
exploit a vulnerability by using the SASL_PATH environment
variable. |
| Alerts: |
|
Comments (none posted)
dhcp: format string vulnerability
| Package(s): | dhcp |
CVE #(s): | CAN-2004-1006
|
| Created: | November 4, 2004 |
Updated: | July 13, 2005 |
| Description: |
Dhcp has a format string vulnerability in the log functions of dhcp 2.x
that may be exploited via a malicious DNS server. |
| Alerts: |
|
Comments (none posted)
Filename disclosure vulnerability in fam
| Package(s): | fam |
CVE #(s): | CAN-2002-0875
|
| Created: | August 19, 2002 |
Updated: | January 5, 2005 |
| Description: |
"fam" (file alteration monitor) watches files and directories for changes and lets interested applications know when something happens. This package has a flaw in its group handling that blocks some legitimate operations while, at the same time, exposing the names of files that should otherwise be invisible. |
| Alerts: |
|
Comments (none posted)
flim: insecure file creation
| Package(s): | flim |
CVE #(s): | CAN-2004-0422
|
| Created: | May 5, 2004 |
Updated: | December 16, 2004 |
| Description: |
The emacs "flim" mode creates temporary files in an insecure fashion, possibly allowing a local attacker to overwrite files. |
| Alerts: |
|
Comments (none posted)
Foomatic: Arbitrary command execution in foomatic-rip
| Package(s): | foomatic |
CVE #(s): | CAN-2004-0801
|
| Created: | September 20, 2004 |
Updated: | May 31, 2006 |
| Description: |
There is a vulnerability in the foomatic-filters package. This
vulnerability is due to insufficient checking of command-line parameters
and environment variables in the foomatic-rip filter. This vulnerability
may allow both local and remote attackers to execute arbitrary commands on
the print server with the permissions of the spooler. |
| Alerts: |
|
Comments (none posted)
freeamp: arbitrary code execution
| Package(s): | freeamp |
CVE #(s): | CAN-2004-0964
|
| Created: | November 8, 2004 |
Updated: | November 10, 2004 |
| Description: |
Luigi Auriemma discovered a buffer overflow condition in the playlist
module of freeamp which could lead to arbitrary code execution.
Recent versions of freeamp were renamed into zinf. |
| Alerts: |
|
Comments (none posted)
FreeRADIUS: denial of service
| Package(s): | freeradius |
CVE #(s): | CAN-2004-0938
CAN-2004-0960
CAN-2004-0961
|
| Created: | September 22, 2004 |
Updated: | February 2, 2005 |
| Description: |
FreeRADIUS (through version 1.0.1) suffers from several denial of service vulnerabilities in its packet reception code. |
| Alerts: |
|
Comments (none posted)
gaim: buffer overflow in MSN protocol
| Package(s): | gaim |
CVE #(s): | CAN-2004-0891
|
| Created: | October 25, 2004 |
Updated: | February 11, 2005 |
| Description: |
A buffer overflow in the MSN protocol handler for gaim 0.79 to 1.0.1 allows
remote attackers to cause a denial of service (application crash) and
possibly execute arbitrary code via an "unexpected sequence of MSNSLP
messages" that results in an unbounded copy operation that writes to the
wrong buffer. |
| Alerts: |
|
Comments (none posted)
gaim: command execution via smiley themes
| Package(s): | gaim |
CVE #(s): | CAN-2004-0784
CAN-2004-0785
|
| Created: | October 21, 2004 |
Updated: | November 12, 2004 |
| Description: |
gaim may allow arbitrary
commands to be executed via shell meta characters in the
the tar file name that is dragged to the smiley selector. |
| Alerts: |
|
Comments (none posted)
Gallery: cross-site scripting vulnerability
| Package(s): | Gallery |
CVE #(s): | CAN-2004-1106
|
| Created: | November 8, 2004 |
Updated: | January 17, 2005 |
| Description: |
Jim Paris has discovered a cross-site scripting vulnerability in
Gallery. By sending a carefully crafted URL, an attacker can inject and
execute script code in the victim's browser window, and potentially
compromise the users gallery. |
| Alerts: |
|
Comments (none posted)
gtk2, gdk-pixbuf: buffer overflows
| Package(s): | gdk-pixbuf gtk2 |
CVE #(s): | CAN-2004-0753
CAN-2004-0782
CAN-2004-0783
CAN-2004-0788
|
| Created: | September 15, 2004 |
Updated: | February 25, 2005 |
| Description: |
The gdk-pixbuf and gtk2 libraries contain vulnerabilities in their handling of BMP and XPM files which can lead to denial of service and, potentially, code execution attacks. |
| Alerts: |
|
Comments (none posted)
gettext: Insecure temporary file handling
| Package(s): | gettext |
CVE #(s): | CAN-2004-0966
|
| Created: | October 11, 2004 |
Updated: | March 1, 2006 |
| Description: |
gettext insecurely creates temporary files in world-writeable directories
with predictable names. A local attacker could create symbolic links in
the temporary files directory, pointing to a valid file somewhere on the
filesystem. When gettext is called, this would result in file access with
the rights of the user running the utility, which could be the root user. |
| Alerts: |
|
Comments (1 posted)
ghostscript: symlink vulnerabilities
| Package(s): | ghostscript |
CVE #(s): | CAN-2004-0967
|
| Created: | October 20, 2004 |
Updated: | September 28, 2005 |
| Description: |
The ghostscript package (prior to version 7.07.1-r7) contains several scripts which are vulnerable to symlink attacks. |
| Alerts: |
|
Comments (none posted)
glibc: Information leak with LD_DEBUG
| Package(s): | glibc |
CVE #(s): | CAN-2004-1453
|
| Created: | August 17, 2004 |
Updated: | May 26, 2005 |
| Description: |
Silvio Cesare discovered a potential information leak in glibc. It allows
LD_DEBUG on SUID binaries where it should not be allowed. This has various
security implications, which may be used to gain confidential information.
An attacker can gain the list of symbols a SUID application uses and their
locations and can then use a trojaned library taking precedence over those
symbols to gain information or perform further exploitation. |
| Alerts: |
|
Comments (1 posted)
glibc: tempfile vulnerability in catchsegv script
| Package(s): | glibc |
CVE #(s): | CAN-2004-0968
|
| Created: | October 21, 2004 |
Updated: | November 14, 2005 |
| Description: |
The catchsegv script in the glibc package has a symlink vulnerability
that may allow a local user to overwrite arbitrary
files with the permissions of the user that is running the script. |
| Alerts: |
|
Comments (none posted)
gnats: format string vulnerability
| Package(s): | gnats |
CVE #(s): | CAN-2004-0623
|
| Created: | November 9, 2004 |
Updated: | November 10, 2004 |
| Description: |
Khan Shirani discovered a format string vulnerability in gnats, the
GNU problem report management system. This problem may be exploited
to execute arbitrary code. |
| Alerts: |
|
Comments (none posted)
gnome-vfs: backend script vulnerabilities
| Package(s): | gnome-vfs |
CVE #(s): | CAN-2004-0494
|
| Created: | August 4, 2004 |
Updated: | February 21, 2005 |
| Description: |
Several scripts packaged with gnome-vfs, using its "extfs" capability, have security flaws. These scripts tend not to be used on many systems, but their presence can still be a threat. |
| Alerts: |
|
Comments (none posted)
groff: insecure temporary directory
| Package(s): | groff |
CVE #(s): | CAN-2004-0969
|
| Created: | November 1, 2004 |
Updated: | February 9, 2006 |
| Description: |
Recently, Trustix Secure Linux discovered a vulnerability in the groff
package. The utility "groffer" created a temporary directory in an
insecure way, which allowed exploitation of a race condition to create
or overwrite files with the privileges of the user invoking the
program. |
| Alerts: |
|
Comments (none posted)
gtkhtml: malformed messages cause crash
| Package(s): | gtkhtml |
CVE #(s): | CAN-2003-0133
CAN-2003-0541
|
| Created: | April 14, 2003 |
Updated: | April 18, 2005 |
| Description: |
GtkHTML is the HTML rendering widget used by the Evolution mail reader.
GtkHTML supplied with versions of Evolution prior to 1.2.4 contain a bug
when handling HTML messages. Alan Cox discovered that certain malformed
messages could cause the Evolution mail component to crash. |
| Alerts: |
|
Comments (none posted)
gzip: insecure temporary files
| Package(s): | gzip |
CVE #(s): | CAN-2004-0970
|
| Created: | November 8, 2004 |
Updated: | December 7, 2004 |
| Description: |
Trustix developers discovered insecure temporary file creation in
supplemental scripts in the gzip package which may allow local users
to overwrite files via a symlink attack. |
| Alerts: |
|
Comments (none posted)
imagemagick: buffer overflow vulnerability
| Package(s): | imagemagick |
CVE #(s): | CAN-2004-0827
|
| Created: | September 16, 2004 |
Updated: | November 30, 2004 |
| Description: |
The ImageMagick graphics library has several buffer overflow
vulnerabilities that allow an attacker to crash the reading process
by creating mal-formed video or image files in the AVI, BMP, or DIB format. |
| Alerts: |
|
Comments (none posted)
ImageMagick: EXIF buffer overflow
| Package(s): | ImageMagick |
CVE #(s): | CAN-2004-0981
|
| Created: | November 8, 2004 |
Updated: | December 8, 2004 |
| Description: |
ImageMagick fails to do proper bounds checking when handling image
files with EXIF information. An attacker could use an image file with
specially-crafted EXIF information to cause arbitrary code execution with
the permissions of the user running ImageMagick. See this advisory for more
information. |
| Alerts: |
|
Comments (none posted)
imlib2: buffer overflows
| Package(s): | imlib2 |
CVE #(s): | CAN-2004-0802
CAN-2004-0817
|
| Created: | September 8, 2004 |
Updated: | October 26, 2005 |
| Description: |
The imlib2 library contains buffer overflows in the BMP handling code. |
| Alerts: |
|
Comments (none posted)
iproute: local denial of service
| Package(s): | iproute net-tools |
CVE #(s): | CAN-2003-0856
|
| Created: | November 25, 2003 |
Updated: | December 14, 2004 |
| Description: |
The iproute utility is susceptible to spoofed netlink messages sent by local users, with the result that denial of service attacks are possible. |
| Alerts: |
|
Comments (none posted)
iptables: missing initialization
| Package(s): | iptables |
CVE #(s): | CAN-2004-0986
|
| Created: | November 1, 2004 |
Updated: | February 11, 2005 |
| Description: |
Faheem Mitha noticed that the iptables command, an administration tool for
IPv4 packet filtering and NAT, did not always load the required modules on
its own as it was supposed to. This could lead to firewall rules not being
loaded on system startup. This caused a failure in connection with rules
provided by lokkit at least. |
| Alerts: |
|
Comments (none posted)
Kaffeine, gxine: remotely exploitable buffer overflow
| Package(s): | Kaffeine gxine |
CVE #(s): | |
| Created: | November 8, 2004 |
Updated: | November 11, 2004 |
| Description: |
KF of Secure Network Operations has discovered an overflow that occurs
during the Content-Type header processing of Kaffeine. The vulnerable code
in Kaffeine is reused from gxine, making gxine vulnerable as well. An
attacker could create a specially-crafted Content-type header from a
malicious HTTP server, and crash a user's instance of Kaffeine or gxine,
potentially allowing the execution of arbitrary code. See this SecurityTracker
advisory for details. |
| Alerts: |
|
Comments (none posted)
kernel-utils: setuid vulnerability
| Package(s): | kernel-utils |
CVE #(s): | CAN-2003-0019
|
| Created: | February 7, 2003 |
Updated: | January 21, 2005 |
| Description: |
The kernel-utils package contains several utilities that can be used to
control the kernel or machine hardware. In Red Hat Linux 8.0 this package
contains user mode linux (UML) utilities.
The uml_net utility in kernel-utils packages with Red Hat Linux 8.0 was
incorrectly shipped setuid root. This could allow local users to control
certain network interfaces, add and remove arp entries and routes, and put
interfaces in and out of promiscuous mode.
All users of the kernel-utils package should update to these packages that
contain a version of uml_net that is not setuid root.
Alternatively, as a work-around to this vulnerability issue the following
command as root:
chmod -s /usr/bin/uml_net |
| Alerts: |
|
Comments (none posted)
libgd2: buffer overflows in PNG handling
| Package(s): | libgd2 |
CVE #(s): | CAN-2004-0990
CAN-2004-0941
|
| Created: | October 29, 2004 |
Updated: | June 28, 2006 |
| Description: |
Several buffer overflows have been discovered in libgd's PNG handling
functions.
If an attacker tricked a user into loading a malicious PNG image, they
could leverage this into executing arbitrary code in the context of
the user opening image. Most importantly, this library is commonly
used in PHP. One possible target would be a PHP driven photo website
that lets users upload images. Therefore this vulnerability might lead
to privilege escalation to a web server's privileges.
Multiple buffer overflows in the gd graphics library (libgd) 2.0.21 and
earlier may allow remote attackers to execute arbitrary code via malformed
image files that trigger the overflows due to improper calls to the
gdMalloc function. |
| Alerts: |
|
Comments (none posted)
libpng: multiple vulnerabilities
Comments (1 posted)
libxml2 - arbitrary code execution
| Package(s): | libxml2 |
CVE #(s): | CAN-2004-0110
|
| Created: | February 26, 2004 |
Updated: | August 19, 2009 |
| Description: |
Yuuichi Teranishi discovered a flaw in libxml2 versions prior to 2.6.6.
When fetching a remote resource via FTP or HTTP, libxml2 uses special
parsing routines. These routines can overflow a buffer if passed a very
long URL. If an attacker is able to find an application using libxml2 that
parses remote resources and allows them to influence the URL, then this
flaw could be used to execute arbitrary code. |
| Alerts: |
|
Comments (none posted)
libxml2: multiple buffer overflows
| Package(s): | libxml2 |
CVE #(s): | CAN-2004-0989
|
| Created: | October 28, 2004 |
Updated: | August 19, 2009 |
| Description: |
libxml2 prior to version 2.6.14 has multiple buffer overflow
vulnerabilities, if a local user passes a specially crafted
FTP URL, arbitrary code may be executed. |
| Alerts: |
|
Comments (none posted)
libxpm4: stack and integer overflows
| Package(s): | libxpm4 |
CVE #(s): | CAN-2004-0687
CAN-2004-0688
|
| Created: | September 16, 2004 |
Updated: | February 14, 2005 |
| Description: |
There are several stack and integer overflow bugs in
the libXpm code of XFree86 that may be used for a denial of service. |
| Alerts: |
|
Comments (none posted)
logcheck: symlink vulnerability
| Package(s): | logcheck |
CVE #(s): | CAN-2004-0404
|
| Created: | April 21, 2004 |
Updated: | December 22, 2004 |
| Description: |
The logcheck utility handles temporary files in an unsafe way, possibly allowing local attackers to overwrite files. |
| Alerts: |
|
Comments (none posted)
lvm10: creates insecure temporary directory
| Package(s): | lvm10 |
CVE #(s): | CAN-2004-0972
|
| Created: | November 1, 2004 |
Updated: | July 25, 2005 |
| Description: |
Trustix Secure Linux discovered a vulnerability in a supplemental script of
the lvm10 package. The program "lvmcreate_initrd" created a temporary
directory in an insecure way, which could allow a symlink attack to create
or overwrite arbitrary files with the privileges of the user invoking the
program. |
| Alerts: |
|
Comments (none posted)
Midnight Commander: extfs vfs vulnerability
| Package(s): | mc |
CVE #(s): | CAN-2004-0494
|
| Created: | September 2, 2004 |
Updated: | January 5, 2005 |
| Description: |
Midnight Commander has a vfs vulnerability with shell quoting
in extfs perl scripts. |
| Alerts: |
|
Comments (none posted)
mikmod: buffer overflow
| Package(s): | mikmod |
CVE #(s): | CAN-2003-0427
|
| Created: | June 16, 2003 |
Updated: | June 16, 2005 |
| Description: |
Ingo Saitz discovered a bug in mikmod whereby a long filename inside
an archive file can overflow a buffer when the archive is being read
by mikmod. |
| Alerts: |
|
Comments (none posted)
mozilla products: arbitrary code execution and other vulnerabilities
| Package(s): | mozilla firefox thunderbird |
CVE #(s): | CAN-2004-0902
CAN-2004-0903
CAN-2004-0904
CAN-2004-0905
CAN-2004-0908
|
| Created: | September 20, 2004 |
Updated: | January 13, 2005 |
| Description: |
Several vulnerabilities exist in the Mozilla web browser and derived
products, the most serious of which could allow a remote attacker to
execute arbitrary code on an affected system. See the CERT advisory for details. |
| Alerts: |
|
Comments (none posted)
mpg123: buffer overflow bug
| Package(s): | mpg123 |
CVE #(s): | CAN-2004-0805
|
| Created: | September 16, 2004 |
Updated: | January 11, 2005 |
| Description: |
The mpg123 audio playing utility has a buffer overflow
bug that may allow arbitrary execution of code. |
| Alerts: |
|
Comments (none posted)
mpg321: format string vulnerability
| Package(s): | mpg321 |
CVE #(s): | CAN-2003-0969
|
| Created: | January 6, 2004 |
Updated: | March 28, 2005 |
| Description: |
A vulnerability was discovered in mpg321, a command-line mp3 player,
whereby user-supplied strings were passed to printf(3) unsafely. This
vulnerability could be exploited by a remote attacker to overwrite
memory, and possibly execute arbitrary code. In order for this
vulnerability to be exploited, mpg321 would need to play a malicious
mp3 file (including via HTTP streaming). |
| Alerts: |
|
Comments (none posted)
mtink: insecure tempfile handling
| Package(s): | mtink |
CVE #(s): | |
| Created: | November 9, 2004 |
Updated: | November 10, 2004 |
| Description: |
Tavis Ormandy from Gentoo Linux discovered that mtink uses insecure
permissions on temporary files. A local attacker could create symbolic
links in the temporary files directory, pointing to a valid file somewhere
on the filesystem. When mtink is executed, this would result in the file
being overwritten with the rights of the user running the utility, which
could be the root user. |
| Alerts: |
|
Comments (none posted)
mysql: several vulnerabilities
| Package(s): | mysql |
CVE #(s): | CAN-2004-0835
CAN-2004-0836
CAN-2004-0837
|
| Created: | October 11, 2004 |
Updated: | April 6, 2005 |
| Description: |
Several problems have been discovered in MySQL. Oleksandr Byelkin noticed
that ALTER TABLE ... RENAME checks CREATE/INSERT rights of the old table
instead of the new one. (CAN-2004-0835) Lukasz Wojtow noticed a buffer
overrun in the mysql_real_connect function. (CAN-2004-0836) Dean Ellis
noticed that multiple threads ALTERing the same (or different) MERGE tables
to change the UNION can cause the server to crash or stall. (CAN-2004-0837) |
| Alerts: |
|
Comments (none posted)
netkit-telnet: invalid free pointer
| Package(s): | netkit-telnet |
CVE #(s): | CAN-2004-0911
|
| Created: | October 4, 2004 |
Updated: | March 28, 2005 |
| Description: |
Michal Zalewski discovered a bug in the netkit-telnet server (telnetd)
whereby a remote attacker could cause the telnetd process to free an
invalid pointer. This causes the telnet server process to crash, leading
to a straightforward denial of service (inetd will disable the service if
telnetd is crashed repeatedly), or possibly the execution of arbitrary code
with the privileges of the telnetd process (by default, the 'telnetd'
user). |
| Alerts: |
|
Comments (none posted)
netpbm: insecure temporary files
| Package(s): | netpbm |
CVE #(s): | CAN-2003-0924
|
| Created: | January 19, 2004 |
Updated: | December 29, 2004 |
| Description: |
netpbm is graphics conversion toolkit made up of a large number of
single-purpose programs. Many of these programs were found to create
temporary files in an insecure manner, which could allow a local
attacker to overwrite files with the privileges of the user invoking a
vulnerable netpbm tool. |
| Alerts: |
|
Comments (1 posted)
openssh: timing attack leads to information disclosure
| Package(s): | openssh |
CVE #(s): | CAN-2003-0190
|
| Created: | May 2, 2003 |
Updated: | November 30, 2004 |
| Description: |
From the advisory:
"During a pen-test we stumbled across a nasty bug in OpenSSH-portable
with PAM support enabled (via the --with-pam configure script switch). This
bug allows a remote attacker to identify valid users on vulnerable systems,
through a simple timing attack. The vulnerability is easy to exploit and
may have high severity, if combined with poor password policies and other
security problems that allow local privilege escalation." |
| Alerts: |
|
Comments (1 posted)
OpenSSL: denial of service vulnerabilities
Comments (1 posted)
pavuk: buffer overflow
| Package(s): | pavuk |
CVE #(s): | CAN-2004-0456
|
| Created: | June 30, 2004 |
Updated: | November 11, 2004 |
| Description: |
Versions of the pavuk web spider through 0.9.28-r1 contain a buffer overflow which could be exploited by a hostile server. |
| Alerts: |
|
Comments (none posted)
perl: insecure temp file creation
| Package(s): | perl |
CVE #(s): | CAN-2004-0976
|
| Created: | November 2, 2004 |
Updated: | December 7, 2004 |
| Description: |
Trustix Secure Linux has discovered some vulnerabilities in the perl
package. The utility "instmodsh", the Perl package "PPPort.pm", and several
test scripts (which are not shipped and only used during build) created
temporary files in an insecure way, which could allow a symlink attack to
create or overwrite arbitrary files with the privileges of the user
invoking the program, or building the perl package, respectively. |
| Alerts: |
|
Comments (none posted)
php: remotely exploitable memory errors
| Package(s): | php |
CVE #(s): | CAN-2004-0594
|
| Created: | July 14, 2004 |
Updated: | February 7, 2005 |
| Description: |
Stefan Esser has issued an advisory regarding a
remotely exploitable hole in PHP (through version 4.3.7). If the
memory_limit feature is in use (as it should be, to prevent denial
of service attacks), allocation failures can be forced at highly
inopportune times, and those failures can be exploited to execute arbitrary
code. The exploit is described as "quite easy," and it can be done
regardless of whether Apache1 or Apache2 is in use. Upgrading to PHP 4.3.8 fixes the
problem; yesterday's PHP 5.0 release also contains the fix (but the
final release candidate did not). |
| Alerts: |
|
Comments (none posted)
PostgreSQL: Insecure temporary file use in make_oidjoins_check
| Package(s): | PostgreSQL |
CVE #(s): | CAN-2004-0977
|
| Created: | October 18, 2004 |
Updated: | December 20, 2004 |
| Description: |
The make_oidjoins_check script insecurely creates temporary files in
world-writeable directories with predictable names. A local attacker could
create symbolic links in the temporary files directory, pointing to a valid
file somewhere on the filesystem. When make_oidjoins_check is called, this
would result in file overwrite with the rights of the user running the
utility, which could be the root user. |
| Alerts: |
|
Comments (none posted)
qt3: BMP image parser heap overflow
| Package(s): | qt3/qt3-non-mt/qt3-32bit/qt3-static |
CVE #(s): | CAN-2004-0691
CAN-2004-0692
CAN-2004-0693
|
| Created: | August 19, 2004 |
Updated: | May 15, 2005 |
| Description: |
A heap overflow in the qt3 BMP image format parser in Qt versions prior to 3.3.3 may allow remote code execution. |
| Alerts: |
|
Comments (none posted)
rp-pppoe, pppoe: missing privilege dropping
| Package(s): | rp-pppoe, pppoe |
CVE #(s): | CAN-2004-0564
|
| Created: | October 4, 2004 |
Updated: | November 15, 2005 |
| Description: |
Max Vozeler discovered a vulnerability in pppoe, the PPP over Ethernet
driver from Roaring Penguin. When the program is running setuid root
(which is not the case in a default Debian installation), an attacker
could overwrite any file on the file system. |
| Alerts: |
|
Comments (none posted)
ruby: infinite loop
| Package(s): | ruby |
CVE #(s): | CAN-2004-0983
|
| Created: | November 8, 2004 |
Updated: | May 15, 2005 |
| Description: |
The upstream developers of Ruby have corrected a problem in the CGI
module for this language. Specially crafted requests could cause an
infinite loop and thus cause the program to eat up cpu cycles. |
| Alerts: |
|
Comments (none posted)
samba: remote DoS vulnerability
| Package(s): | samba |
CVE #(s): | CAN-2004-0930
CAN-2004-0882
|
| Created: | November 8, 2004 |
Updated: | December 1, 2004 |
| Description: |
According to this Samba advisory a remote
attacker could cause an smbd process to consume abnormal amounts of system
resources due to an input validation error when matching filenames
containing wildcard characters. Versions of Samba 3.0.x up to and
including 3.0.7 are vulnerable.
There is also an advisory about possible
buffer overruns in smbd. |
| Alerts: |
|
Comments (none posted)
shadow: unauthorized modification of account information
| Package(s): | shadow |
CVE #(s): | CAN-2004-1001
|
| Created: | November 4, 2004 |
Updated: | November 23, 2004 |
| Description: |
The shadow user account utilities have a potential problem with
the chfn and chsh utilities that may allow unauthorized users to
modify account properties. |
| Alerts: |
|
Comments (none posted)
sharutils: arbitrary code execution
| Package(s): | sharutils |
CVE #(s): | CAN-2004-1772
|
| Created: | October 1, 2004 |
Updated: | April 26, 2005 |
| Description: |
sharutils contains two buffer overflows. Ulf Harnhammar discovered a buffer
overflow in shar.c, where the length of data returned by the wc command is
not checked. Florian Schilhabel discovered another buffer overflow in
unshar.c. An attacker could exploit these vulnerabilities to execute
arbitrary code as the user running one of the sharutils programs. |
| Alerts: |
|
Comments (none posted)
sox: buffer overflow
| Package(s): | sox |
CVE #(s): | CAN-2004-0557
|
| Created: | July 28, 2004 |
Updated: | February 21, 2005 |
| Description: |
Sox suffers from buffer overflows in its WAV file handling; these overflows could conceivably be exploited by way of a malicious sound file. |
| Alerts: |
|
Comments (none posted)
SpamAssassin: Denial of Service vulnerability
| Package(s): | spamassassin |
CVE #(s): | CAN-2004-0796
|
| Created: | August 9, 2004 |
Updated: | August 11, 2005 |
| Description: |
SpamAssassin contains an unspecified Denial of Service vulnerability. By
sending a specially crafted message an attacker could cause a Denial of
Service attack against the SpamAssassin service. |
| Alerts: |
|
Comments (none posted)
Speedtouch USB driver: Privilege escalation vulnerability
| Package(s): | Speedtouch USB driver |
CVE #(s): | |
| Created: | November 2, 2004 |
Updated: | November 11, 2004 |
| Description: |
The Speedtouch USB driver contains multiple format string vulnerabilities
in modem_run, pppoa2 and pppoa3. This flaw is due to an improperly made
syslog() system call. A malicious local user could exploit this
vulnerability by causing a buffer overflow, and potentially allowing the
execution of arbitrary code with escalated privileges. |
| Alerts: |
|
Comments (none posted)
Subversion: Remote heap overflow
| Package(s): | subversion |
CVE #(s): | CAN-2004-0413
|
| Created: | June 11, 2004 |
Updated: | March 7, 2005 |
| Description: |
Subversion has a remote Denial of Service vulnerability
that may allow a server that runs svnserve to execute
arbitrary code. See this advisory for more information. |
| Alerts: |
|
Comments (none posted)
File overwrite vulnerability in tar and unzip
| Package(s): | tar unzip |
CVE #(s): | CAN-2001-1267
CAN-2001-1268
CAN-2001-1269
CAN-2002-0399
|
| Created: | October 1, 2002 |
Updated: | April 10, 2006 |
| Description: |
The tar utility does not properly filter file names containing
"../", meaning that a hostile archive can, if unpacked by an
unsuspecting user, overwrite any file that is writable by that user. GNU
tar versions 1.13.19 and earlier are vulnerable; unzip through version 5.42
has the same vulnerability. |
| Alerts: |
|
Comments (1 posted)
tiff: buffer overflows
| Package(s): | tiff |
CVE #(s): | CAN-2004-0803
|
| Created: | October 13, 2004 |
Updated: | April 12, 2005 |
| Description: |
The tiff library contains several buffer overflows which may be exploited
by way of maliciously-crafted image files. See this advisory for more information. |
| Alerts: |
|
Comments (none posted)
WordPress: HTTP response splitting and XSS vulnerabilities
| Package(s): | wordpress |
CVE #(s): | |
| Created: | October 14, 2004 |
Updated: | December 20, 2004 |
| Description: |
WordPress is vulnerable to HTTP response splitting and cross-site scripting
attacks, due to the lack of input validation in the administration panel
scripts. A malicious user could inject arbitrary response data, leading to
content spoofing, web cache poisoning and other cross-site scripting or
HTTP response splitting attacks. This could result in compromising the
victim's data or browser. |
| Alerts: |
|
Comments (none posted)
wv: buffer overflow
| Package(s): | wv |
CVE #(s): | CAN-2004-0645
|
| Created: | July 14, 2004 |
Updated: | February 10, 2005 |
| Description: |
wv, a viewer for MS Word files, contains a buffer overflow which may be exploited by a suitably-crafted file. Version 1.0.0-r1 fixes the problem. |
| Alerts: |
|
Comments (none posted)
XChat 2.0.x SOCKS5 Vulnerability
| Package(s): | xchat |
CVE #(s): | CAN-2004-0409
|
| Created: | April 19, 2004 |
Updated: | November 15, 2005 |
| Description: |
XChat is vulnerable to a stack overflow that may allow a remote attacker to
run arbitrary code. The SOCKS 5 proxy code in XChat is vulnerable to a
remote exploit. Users would have to be using XChat through a SOCKS 5
server, enable SOCKS 5 traversal which is disabled by default and also
connect to an attacker's custom proxy server. This vulnerability may allow
an attacker to run arbitrary code within the context of the user ID of the
XChat client. |
| Alerts: |
|
Comments (none posted)
xine-lib: buffer overflows
| Package(s): | xine-lib |
CVE #(s): | CAN-2004-1379
|
| Created: | September 22, 2004 |
Updated: | April 10, 2006 |
| Description: |
xine-lib (through version 1_rc6) contains buffer overflows in the subtitle parsing and DVD sub-picture decoder code. |
| Alerts: |
|
Comments (none posted)
xine-ui - insecure temporary file creation
| Package(s): | xine-ui |
CVE #(s): | CAN-2004-0372
|
| Created: | April 6, 2004 |
Updated: | April 27, 2006 |
| Description: |
Shaun Colley discovered a problem in xine-ui, the xine video player
user interface. A script contained in the package to possibly remedy
a problem or report a bug does not create temporary files in a secure
fashion. This could allow a local attacker to overwrite files with
the privileges of the user invoking xine. |
| Alerts: |
|
Comments (none posted)
xpdf: integer overflows
| Package(s): | xpdf kpdf cupsys |
CVE #(s): | CAN-2004-0888
CAN-2004-0889
|
| Created: | October 21, 2004 |
Updated: | February 18, 2005 |
| Description: |
Several xpdf integer overflow vulnerabilities can be exploited via a
mal-formed PDF document. Similar vulnerabilities can be found in kpdf and
in cupsys which share code. Additional information can be found in this KDE security advisory. |
| Alerts: |
|
Comments (none posted)
zgv: multiple buffer overflows
| Package(s): | zgv |
CVE #(s): | |
| Created: | November 8, 2004 |
Updated: | December 14, 2004 |
| Description: |
Multiple arithmetic overflows have been detected in the image
processing code of zgv. An attacker could entice a user to open a
specially-crafted image file, potentially resulting in execution of
arbitrary code with the rights of the user running zgv. See this BugTraq advisory
for more information. |
| Alerts: |
|
Comments (none posted)
zip: arbitrary code execution
| Package(s): | zip |
CVE #(s): | CAN-2004-1010
|
| Created: | November 5, 2004 |
Updated: | February 2, 2005 |
| Description: |
HexView discovered a buffer overflow in the zip package. The overflow is
triggered by creating a ZIP archive of files with very long path
names. This vulnerability might result in execution of arbitrary code with
the privileges of the user who calls zip. This flaw may lead to privilege
escalation on systems which automatically create ZIP archives of user
supplied files, like backup systems or web applications. |
| Alerts: |
|
Comments (1 posted)
zlib: denial of service
| Package(s): | zlib |
CVE #(s): | CAN-2004-0797
|
| Created: | August 25, 2004 |
Updated: | June 10, 2005 |
| Description: |
Versions 1.2.x of the zlib library contain an error handling vulnerability which can enable denial of service attacks. |
| Alerts: |
|
Comments (none posted)
Page editor: Jonathan Corbet
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