As detailed in this CERT advisory, the
sendmail source distribution on ftp.sendmail.org was replaced by a version
containing a trojan horse. The modified code stayed on the server from
September 28 through October 6. The trojan was invoked during
the build process; it would fire off a process that would listen for
commands on port 6667. If you downloaded and installed sendmail during
that time period, you need to take a serious look at the integrity of your
systems.
Free software is supposed to be more secure because the source can be
examined for this sort of thing. Yet this particular bit of malware
managed to stay on a high-profile server for over a week. When you
consider that, for example, the Interbase back door went undiscovered for
over a year, one week does not seem all that bad. But one week is plenty
of time to compromise a great many systems.
What is truly surprising is that we have not seen more of this sort of
problem. Trojanized source distributions are scary; a compromised binary
package is truly terrifying. There will be more - and worse -
episodes of this nature in the future.
Of course, we have the tools to defend against most of these attacks. If
you put up software for others to download, you should sign it with a
cryptographic key. If you download software, you should check that
signature. As long as the signing keys are handled carefully
(i.e. not stored on the FTP server!), this bit of hygene will detect
almost all tampering attacks. Without such checks, administrators are
placing a great deal of trust in the security of every system they download
software from.
Versions of Apache prior to 1.3.27 contain a couple of scoreboard-related
vulnerabilities which can be exploited by local users running under the
Apache user ID. In-server scripting languages, such as PHP, are the most
likely means of carrying out the attacks. One vulnerability causes the
server to fork off new processes, leading to denial of service scenarios;
the other allows an attacker to send SIGUSR1 to any process as root,
probably killing that process. See this
iDEFENSE advisory for the details.
SSL certificate validation vulnerability in evolution
Package(s):
evolution
CVE #(s):
Created:
October 9, 2002
Updated:
October 9, 2002
Description:
The evolution mail client does not properly check SSL certificates, leaving
it open to man-in-the-middle attacks; see this
advisory for details. Versions 1.0.x are vulnerable; the 1.1 beta
branch is not.
Alerts:
(No alerts in the database for this vulnerability)
The nss_ldap package has a buffer overflow which can be exploited when the
module configures itself from information in DNS. The problem is fixed in
nss_ldap-199 and later.
usePerl has a
description of a vulnerability in the Safe.pm Perl module. It seems
that if a Safe compartment is used more than once, it ceases to be safe.
The problem is fixed in Safe 2.08.
Versions of Apache 2.0 prior to 2.0.43 have a
cross-site scripting vulnerability in the error page handling code. If
you are running Apache 2.0, this one is worth fixing.
Alerts:
(No alerts in the database for this vulnerability)
The BIND 4.9.8-OW2 patch and BIND 4.9.9 release (and thus 4.9.9-OW1)
include fixes for a libc related vulnerability which does not
affect Linux. Updates from
the Internet Software Consortium (ISC)
are available from here.
No release or branch of Openwall GNU/*/Linux (Owl) is known to be
affected, due to Olaf Kirch's fixes for this problem getting into the
GNU C library more than two years ago.
Unfortunatly that does not mean that Linux systems are not vulnerable.
Similar code, without Olaf Firch's fixes,
is in the glibc getnetbyXXX functions.
These functions are described in the SuSE alert as
"
used by very few applications only, such as ifconfig and ifuser,
which makes exploits less likely."
CERT Advisory: CA-2002-19
Buffer Overflow in Multiple DNS Resolver Libraries
The Bugzilla bug tracking system (versions prior to 2.14.4 or 2.16.1)
suffers from a number of vulnerablities, including one which could result
in remote command and SQL injection. An upgrade to 2.16.1 is recommended,
since the 2.14 branch will be unmaintained after the end of the year. See
the Bugzilla advisory for details.
Felix von Leitner, discovered a
potential division by zero bug in
code derived from the SunRPC library with is used in
dietlibc, a libc optimized for small size.
The bug could be exploited to gain unauthorized root
access to software linking to dietlibc.
CERT/CC Vulnerability Note VU#192995 Integer
overflow in xdr_array() function when deserializing the XDR stream
Ethereal 0.9.4
was released
on May 19, 2002 fixing four potential security issues in Ethereal 0.9.3:
The SMB dissector could potentially dereference a NULL pointer in two cases.
The X11 dissector could potentially overflow a buffer while parsing keysyms.
The DNS dissector could go into an infinite loop while reading a malformed packet.
The GIOP dissector could potentially allocate large amounts of memory.
No known exploits exist "in the wild" at the present time for any of these issues.
Ethereal 0.9.2 has several packet handling vulnerabilities
that are best avoided by upgrading to 0.9.4.
The PROTOS test
suite found some flaws in SNMP and LDAP protocols support.
Malformed packets could also crash ethereal 0.9.2 due to a
ASN.1 zero-length g_malloc problem.
The zlib "double free" vulnerability
was addressed by the updates for that bug from many distributors.
"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.
e-matters GmbH has issued an advisory
warning of a new set of buffer overflows in the fetchmail header parsing
code. The vulnerabilities have been fixed in fetchmail 6.1.0.
A race
condition in rm may cause the root user to delete the whole filesystem.
The problem exists in the version of rm in
fileutils
4.1 stable and 4.1.6 development version. A patch
is available.
(First LWN
report: May 2).
Felix von Leitner, discovered a
potential division by zero bug in
code derived from the SunRPC library which is used in glibc.This bug could be
exploited to gain unauthorized root access to software linking to glibc.
Updating as soon as practical is a good idea.
Because SunRPC-derived XDR libraries are used by a variety of vendors in a variety of applications, this defect may lead to a number of differing security problems. Exploiting this vulnerability will lead to denial of service, execution of arbitrary code, or the disclosure of sensitive information.
CERT/CC Vulnerability Note VU#192995 Integer
overflow in xdr_array() function when deserializing the XDR stream
gv, a graphical front end to ghostscript, has a buffer overflow
vulnerability which can be exploited by a properly crafted PostScript or
PDF file. If a user can be tricked into viewing such a file, arbitrary
code can be executed with that user's privileges. See this iDEFENSE advisory for the details.
A SuSE security team audit of the heimdal Kerberos implementation turned up sever buffer overflow vulnerabilities. No exploits are known as of this writing, but these vulnerabilities are almost certainly possible for a remote attacker to exploit; if you are running heimdal, you should upgrade at the first opportunity.
The HylaFAX team has
released version 4.1.3 fixing
denial of service, elevated system privilege and possible
remote code execution vulnerabilities.
HylaFAX is a mature (est. 1991) enterprise-class open-source software
package for sending and receiving facsimiles as well as for sending
alpha-numeric pages. It runs on a wide variety of UNIX-like platforms
including Linux, BSD (including Mac OS X), SunOS and Solaris, SCO, IRIX,
AIX, and HP-UX.
UW imapd versions 2000c and prior allow remote authenticated users to execute code via a buffer overflow. A malicious user can craft
a request to run commands on the server under their UID and GID.
(First LWN report: May 23).
Cross-site scripting vulnerability in Konqueror for KDE 3.0.3
Package(s):
kdelibs
CVE #(s):
Created:
September 17, 2002
Updated:
November 18, 2002
Description:
Konqueror for KDE 3.0.3, and earlier versions, is subject to
this cross-site
scripting vulnerability.
Since the problem is in kdelibs, any other application which
uses the KHTML renderer is also vulnerable.
Javascript code running in one frame can
access other frames which should be inaccessible. The problem is
fixed in kdelibs 3.0.3a.
Kerberos 5 unauthorized root access to KDC host vulnerability
Package(s):
krb5
CVE #(s):
Created:
August 14, 2002
Updated:
October 29, 2002
Description:
A bug in the Kerberos 5 remote
administration service, "kadmind", could be
exploited to gain unauthorized root access to a KDC host.
It is believed that the attacker needs to be able to
authenticate to the kadmin daemon for this attack to be successful.
Felix von Leitner, discovered this
potential division by zero bug in
code derived from the SunRPC library which is used
in many places, including the Kerberos 5 administration system.
Updating now is recommended.
CERT/CC Vulnerability Note VU#192995 Integer
overflow in xdr_array() function when deserializing the XDR stream
Mhonarc is an HTML formatter for electronic mail; it can be vulnerable to cross-site scripting problems when presented with maliciously crafted messages. This problem is fixed in mhonarc version 2.5.3, but it is not clear that all possible vulnerabilities have been fixed. See the Debian advisory below for information on how to disable text/html attachment support in mhonarc, which may be a more secure solution.
PHP 4.2.0 and 4.2.1 have an error in the handling of POST requests which
can lead to the corruption of memory, and the usual bad consequences. According to this alert, the vulnerability can only be used for denial of service on x86 systems - there is no way to get it to run exploit code. SPARC/Solaris systems are apparently vulnerable to full remote compromise.
According to the CERT Advisory,
almost every Linux distributor, it seems, ships older (and thus not vulnerable) versions of PHP.
Note that, sometimes, systems thought to be safe from remote compromise turn out to be vulnerable to a modified attack, so x86 users should not relax too much. The solution, for those systems with PHP
4.2.0 or 4.2.1 installed,
is to upgrade to PHP 4.2.2.
For more information see the alert from
the discover of the vulnerability, Stefan Esser of e-matters GmbH,
or the security
advisory from the php team.
This XMLHttpRequest security
bug impacts all Mozilla-based browsers. "The bug is found in versions of
Mozilla from 0.9.7 to 0.9.9 on various operating
system platforms, and in Netscape versions 6.1 and
higher."
(First LWN
report: May 2).
The nss_ldap package includes the pam_ldap module for
authenticating a user with an LDAP database.
Pam_ldap versions prior to 144 have a string format
bug in the logging mechanism.
PHP versions 4.0.5 through 4.1.0 fail to properly cleanse a parameter to the mail() function, allowing arbitrary command execution by local and (possibly) remote attackers.
Pine has an
unpleasant
vulnerability in URL handling vulnerability which can lead to
command execution by remote attackers.
(First LWN report: January 17th).
This vulnerability is remotely exploitable; updating is a good idea.
Note: If an update isn't yet available for your distribution,
setting enable-msg-view-urls to "off" in pine's setup will
avoid the vulnerability. (Thanks to Greg Herlein).
PostgreSQL 7.2.2 has been released in response to a number of buffer
overrun vulnerabilities which have been identified recently. "...it
should be noted that these vulnerabilities are only critical on 'open' or
'shared' systems, as they require the ability to be able to connect to the
database before they can be exploited."
Buffer overflow vulnerabilities fixed include those reported by
"Sir Mordred The Traitor" in the cash_words,
repeat, and lpad
and rpad functions.
The PXE server can be crashed using DHCP packets from
some Voice Over IP (VOIP) phones. Maliciously formed
DHCP packets could be used by a remote attacker to effect a
denial of service attack.
The PXE package contains the PXE (Preboot eXecution Environment)
server and code needed for Linux to boot from a boot disk image on a
Linux PXE server.
Zack Weinberg discovered that
os._execvpe from os.py uses a predictable name which could lead
to execution of arbitrary code. According to the Debian
advisory, the problem
was present in Python versions 1.5, 2.1 and 2.2.
iDEFENSE has posted an advisory warning of a
couple of ways of bypassing the restrictions imposed by the sendmail
"smrsh" utility. smrsh puts limits on which programs a user may run out of
a .forward file; this vulnerability could give a local user
undesired access to the mail server system. A patch has
been made available from sendmail.org which closes the vulnerability.
According to the CVE entry,
"uudecode, as available in the sharutils package before 4.2.1, does not
check whether the filename of the uudecoded file is a pipe or symbolic
link, which could allow attackers to overwrite files or execute commands."
(First LWN
report: May 16).
Multiple vulnerabilities fixed in Squid-2.4.STABLE7
Package(s):
squid
CVE #(s):
Created:
July 8, 2002
Updated:
November 15, 2002
Description:
Here is the security advisory for the Squid proxy server reporting several vulnerabilities in versions up to and including 2.4.STABLE7.
Several of the bugs are believed to allow remote code execution.
Several bugfixes and cleanup of the Gopher client, both
to correct some security issues and to make Squid properly
render certain Gopher menus.
Security fixes in how Squid parses FTP directory listings into
HTML
FTP data channels are now sanity checked to match the address
of the requested FTP server. This to prevent theft or injection
of data. See the new ftp_sanitycheck directive if this sanity
check is not desired.
The MSNT auth helper has been updated to v2.0.3+fixes for
buffer overflow security issues found in this helper.
A security issue in how Squid forwards proxy authentication
credentials has been fixed
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.
A buffer overflow in tcpdump can be triggered by a bad NFS packet when
tracing the network. Unmodified tcpdump versions 3.6.2 and earlier are vulnerable.
This vulnerability,
originally thought to be confined to BSD-derived systems, was first covered
in the July 26th Security
Summary. It is now known that Linux telnet daemons are vulnerable as
well.
Rossen Raykov reports that Tomcat 4.0.5 and 4.1.12 fix a JSP source code exposure vulnerability
in "Tomcat 4.0.4 and 4.1.10 (probably all other earlier versions also).".
The current version of Tomcat is available here.
Tomcat is the servlet container that is used in the official
Reference Implementation for the
Java Servlet and JavaServer Pages technologies.
The Java Servlet and JavaServer Pages specifications are developed by Sun
under the Java
Community Process.
chfn (change finger information) is one of the utilities in
the util-linux package.
The BindView RAZOR Team has discovered a local root vulnerability
in chfn which is described in the Bindview Advisory.
Under certain conditions, "a
carefully crafted attack sequence can be performed to exploit a
complex file locking and modification race present in this utility,
and, as a result, alter /etc/passwd to escalate privileges in the
system." The conditions include a password file, /etc/passwd, over 4 kilobytes and locating the attacker's account record in any
but the last 4 kB chunk of the file.
CERT/CC Vulnerability Note VU#405955 util-linux package vulnerable to privilege escalation when "ptmptmp" file is not removed properly when using "chfn" utility
webalizer: reverse DNS buffer overflow vulnerability
Package(s):
webalizer
CVE #(s):
Created:
May 21, 2002
Updated:
January 27, 2003
Description:
The cause is a buffer overflow bug.
This one sounds nasty.
If reverse DNS lookups are enabled in webalizer,
"an attacker with control over the victims DNS may spoof responses thus
triggering a buffer overflow, potentially leading to a root compromise."
Webalizer 2.01-10 "fixes this and a few
other buglets that have been discovered in the last month or so".
(First LWN report: April 18th, 2002).
This one is scary. The session ID
spoofing vulnerability allows the "possibility that arbitrary
commands may be executed with root privileges."
Upgrading is strongly recommended. At a minimum avoid the
"preconditions for a successful exploit" by disabling
password timeouts under Webmin->Configuration->Authentication.
The "wordtrans" interface to multilingual dictionaries suffers from input validation and cross-site scripting vulnerabilities; versions through 1.1pre8 are vulnerable. See this Guardent advisory for details.
The libgtop_daemon package is a GNOME
program which makes system information available remotely.
LWN reported the remotely exploitable format
string and buffer overflow vulnerabilities in that package
on December 6th.
On November 28th
disabling the libgtop_daemon on systems where it is running until
an update is available.
Many Linux systems do not run
libgtop by default, but applying the update is a good idea anyway.
The wwwoffle web proxy incorrectly processes HTTP PUT and POST requests
with negative Content Length values.
"It is believed
that an attacker could exploit this bug to gain remote wwwrun access
to the system wwwoffled is running on."
Local privilege escalation vulnerability in XFree86
Package(s):
xf86 xfree86
CVE #(s):
Created:
September 18, 2002
Updated:
October 27, 2002
Description:
XFree86 version 4.2.1 fixes a problem in
Xlib that made it possible to execute arbitrary code in privileged clients.
Other libraries are dynamically loaded by libX11.so as needed.
When linking against a setuid program, arbitrary code
could be loaded and executed from a pathname controlled by the user.
A file descriptor leak into services started from xinetd
may be used, by programs it stats, to crash xinetd.
Xinetd is a replacement for the BSD derived inetd.
News.com has a report from Whitfield Diffie's talk at the RSA conference.
"Diffie also said that security cannot be delegated, nor can a user rely on one company for security. 'Openness is essential for trust,' he said, referring to open-source code, as well as compatibility."
Michael D. Bauer
talks about Linux security issues on O'Reilly.
"I don't presume to know in any definitive way whether Linux is more or less securable than other Unix variants. What I do know is this: Linux is useful, stable, and securable enough to warrant the time and effort required to "harden" it against Internet threats. This article explains some of the reasons I believe it's both possible and worthwhile to secure Linux for use as an Internet server platform."
The 19th annual Chaos Computer Club Congress will be held in Berlin on
December 27 to 29. The Call for Papers has gone out; no deadline
for submissions has been specified. "So, do you dare to speak in
front of people who might have downloaded your
script from your computer in advance and spotted all the logical
errors?"
