Security

It was discovered that BIND, an implementation of the DNS protocol, does not correctly process certain large RRSIG record sets in DNSSEC responses. The resulting assertion failure causes the name server process to crash, making name resolution unavailable.

CVE-2011-1292: Use-after-free vulnerability in the frame-loader implementation in Google Chrome allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

CVE-2011-1293: Use-after-free vulnerability in the HTMLCollection implementation in Google Chrome allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

CVE-2011-1440: Use-after-free vulnerability in Google Chrome allows remote attackers to cause a denial of service or possibly have unspecified other impact via vectors related to the ruby element and Cascading Style Sheets (CSS) token sequences.

CVE-2011-1444: Race condition in the sandbox launcher implementation in Google Chrome on Linux allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

CVE-2011-1797: Google Chrome does not properly render tables, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors that lead to a "stale pointer."

CVE-2011-1799: Google Chrome does not properly perform casts of variables during interaction with the WebKit engine, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

From the Debian advisory:

Wouter Coekaerts discovered that the jabber server component of citadel, a complete and feature-rich groupware server, is vulnerable to the so-called "billion laughs" attack because it does not prevent entity expansion on received data. This allows an attacker to perform denial of service attacks against the service by sending specially crafted XML data to it.

From the Mandriva advisory:

lib-mail/message-header-parser.c in Dovecot 1.2.x before 1.2.17 and 2.0.x before 2.0.13 does not properly handle '\0' (NUL) characters in header names, which allows remote attackers to cause a denial of service (daemon crash or mailbox corruption) via a crafted e-mail message (CVE-2011-1929).

From the Debian advisory:

Wouter Coekaerts discovered that ejabberd, a distributed XMPP/Jabber server written in Erlang, is vulnerable to the so-called "billion laughs" attack because it does not prevent entity expansion on received data. This allows an attacker to perform denial of service attacks against the service by sending specially crafted XML data to it.

From the Ubuntu advisory:

Juraj Somorovsky, Jorg Schwenk, Meiko Jensen and Xiaofeng Lou discovered that Eucalyptus did not properly validate SOAP requests. An unauthenticated remote attacker could exploit this to submit arbitrary commands to the Eucalyptus SOAP interface in the context of an authenticated user.

From the Red Hat Bugzilla entry:

Henne Vogelsang discovered that, as of glib 2.28, it was possible to run the default web browser (usually Firefox) in the GDM session, as the gdm user. This resulted in uncontrolled access to the local file system and possibly other resources as the gdm user. This is because glib 2.28 has changed the way URI handlers are registered; while it used to be controlled via gconf settings, it now is controlled via x-scheme-handler/<scheme> mime types (e.g. x-scheme-handler/http).

An integer overflow flaw, leading to a heap-based buffer overflow, was found in the GIMP's Microsoft Windows Bitmap (BMP) and Personal Computer eXchange (PCX) image file plug-ins. An attacker could create a specially-crafted BMP or PCX image file that, when opened, could cause the relevant plug-in to crash or, potentially, execute arbitrary code with the privileges of the user running the GIMP.

Heap-based buffer overflow in the read_channel_data function in file-psp.c in the Paint Shop Pro (PSP) plugin in GIMP 2.6.11 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a PSP_COMP_RLE (aka RLE compression) image file that begins a long run count at the end of the image.

From the Debian advisory:

Wouter Coekaerts discovered that jabberd14, an instant messaging server using the Jabber/XMPP protocol, is vulnerable to the so-called "billion laughs" attack because it does not prevent entity expansion on received data. This allows an attacker to perform denial of service attacks against the service by sending specially crafted XML data to it.

* Missing error checking in the way page tables were handled in the Xen hypervisor implementation could allow a privileged guest user to cause the host, and the guests, to lock up. (CVE-2011-1166, Moderate)

* A flaw was found in the way the Xen hypervisor implementation checked for the upper boundary when getting a new event channel port. A privileged guest user could use this flaw to cause a denial of service or escalate their privileges. (CVE-2011-1763, Moderate)

Goldwyn Rodrigues discovered that the OCFS2 filesystem did not correctly clear memory when writing certain file holes. A local attacker could exploit this to read uninitialized data from the disk, leading to a loss of privacy. (CVE-2011-0463)

Nelson Elhage discovered that the epoll subsystem did not correctly handle certain structures. A local attacker could create malicious requests that would consume large amounts of CPU, leading to a denial of service. (CVE-2011-1083)

specially crafted files could cause a stack overflow in libmodplug (CVE-2011-1761). libmodplug version 0.8.8.3 fixes the problem.

CVE-2011-1402: It was discovered that previous versions of Mahara did not check user credentials before adding a secret URL to a view or suspending a user.

CVE-2011-1403: Due to a misconfiguration of the Pieform package in Mahara, the cross-site request forgery protection mechanism that Mahara relies on to harden its form was not working and was essentially disabled. This is a critical vulnerability which could allow attackers to trick other users (for example administrators) into performing malicious actions on behalf of the attacker. Most Mahara forms are vulnerable.

CVE-2011-1404: Many of the JSON structures returned by Mahara for its AJAX interactions included more information than what ought to be disclosed to the logged in user. New versions of Mahara limit this information to what is necessary for each page.

CVE-2011-1405: Previous versions of Mahara did not escape the contents of HTML emails sent to users. Depending on the filters enabled in one's mail reader, it could lead to cross-site scripting attacks.

CVE-2011-1406: It has been pointed out to us that if Mahara is configured (through its wwwroot variable) to use HTTPS, it will happily let users login via the HTTP version of the site if the web server is configured to serve content over both protocol. The new version of Mahara will, when the wwwroot points to an HTTPS URL, automatically redirect to HTTPS if it detects that it is being run over HTTP.

From the Red Hat Bugzilla entry:

Luigi Auriemma reported a deficiency in the way Mumble server processed malformed SQL query data. A remote, authenticated user could use this flaw to cause denial of service (mumble server termination) via specially-crafted QueryUsers Qt SQLite SQL query.

It was discovered that the PAM pam_xauth module incorrectly verified certain file properties. A local attacker could use this flaw to cause a denial of service.

The Net::HTTPS module in libwww-perl (LWP) before 6.00, as used in WWW::Mechanize, LWP::UserAgent, and other products, when running in environments that do not set the If-SSL-Cert-Subject header, does not enable full validation of SSL certificates by default, which allows remote attackers to spoof servers via man-in-the-middle (MITM) attacks involving hostnames that are not properly validated. NOTE: it could be argued that this is a design limitation of the Net::HTTPS API, and separate implementations should be independently assigned CVE identifiers for not working around this limitation. However, because this API was modified within LWP, a single CVE identifier has been assigned.

Potential SQL Injection Vector When Using PDO_MySql

John Barber reported a problem where, if the system administrator misconfigures rssh by providing two few access bits in the configuration file, the user will be given default permissions (scp) to the entire system, potentially circumventing any configured chroot. Fixing this required a behavior change: In the past, using rssh without a config file would give all users default access to use scp on an unchrooted system. In order to correct the reported bug, this feature has been eliminated, and you must now have a valid configuration file. If no config file exists, all users will be locked out.

CVE-2011-1752: The mod_dav_svn Apache HTTPD server module can be crashed though when asked to deliver baselined WebDAV resources.

CVE-2011-1783: The mod_dav_svn Apache HTTPD server module can trigger a loop which consumes all available memory on the system.

CVE-2011-1921: The mod_dav_svn Apache HTTPD server module may leak to remote users the file contents of files configured to be unreadable by those users.

Two divide-by-zero flaws were found in the way systemtap interpreted certain corrupted DWARF expressions. A privileged user able to execute arbitrary systemtap scripts could be tricked into triggering this flaw to crash the target machine. An unprivileged user (in the stapusr group) may be able to trigger this flaw to crash the target machine, only if unprivileged mode was enabled by the system administrator.

It was discovered that Unbound, a caching DNS resolver, ceases to provide answers for zones signed using DNSSEC after it has processed a crafted query.

Unbound is designed as a set of modular components, so that also DNSSEC (secure DNS) validation and stub-resolvers (that do not run as a server, but are linked into an application) are easily possible. Denial of Service fix.

From the Mandriva advisory:

This advisory updates wireshark to the latest version (1.2.17), fixing several security issues:

* Large/infinite loop in the DICOM dissector. (Bug 5876) Versions affected: 1.2.0 to 1.2.16 and 1.4.0 to 1.4.6.

* Huzaifa Sidhpurwala of the Red Hat Security Response Team discovered that a corrupted Diameter dictionary file could crash Wireshark. Versions affected: 1.2.0 to 1.2.16 and 1.4.0 to 1.4.6.

* Huzaifa Sidhpurwala of the Red Hat Security Response Team discovered that a corrupted snoop file could crash Wireshark. (Bug 5912) Versions affected: 1.2.0 to 1.2.16 and 1.4.0 to 1.4.6.

* David Maciejak of Fortinet's FortiGuard Labs discovered that malformed compressed capture data could crash Wireshark. (Bug 5908) Versions affected: 1.2.0 to 1.2.16 and 1.4.0 to 1.4.6.

* Huzaifa Sidhpurwala of the Red Hat Security Response Team discovered that a corrupted Visual Networks file could crash Wireshark. (Bug 5934) Versions affected: 1.2.0 to 1.2.16 and 1.4.0 to 1.4.6.