The g_markup_escape_text function in the SILC protocol plug-in in libpurple 2.10.0 and earlier, as used in Pidgin and possibly other products, allows remote attackers to cause a denial of service (crash) via invalid UTF-8 sequences that trigger use of invalid pointers and an out-of-bounds read, related to interactions with certain versions of glib2.

This update fixes the following security issues :

  - 722199: libpurple vulnerability in SILC protocol     handling (CVE-2011-3594)

pidgin was updated to version 2.10.1

  + AIM and ICQ :

  - Fix remotely-triggerable crashes by validating strings     in a few messages related to buddy list management     (bnc#736147, CVE-2011-4601).

  + Bonjour :

  - IPv6 fixes

  + Gadu-Gadu :

  - Fix problems linking against GnuTLS.

  + IRC :

  - Fix a memory leak when admitting UTF-8 text with a     non-UTF-8 primary encoding.

  + Jabber :

  - Fix crashes and memory leaks when receiving malformed     voice and video requests.

  + Sametime :

  - Separate 'username' and 'server' when adding new     Sametime accounts.

  - Fix compilation in Visual C++.

  + SILC :

  - Fix CVE-2011-3594, by UTF-8 validating incoming messages     before passing them to glib or libpurple.

  + Yahoo! :

  - Fetch buddy icons in some cases where we previously     weren't.

specially crafted SILC messages could crash libpurple (CVE-2011-3594)

From Red Hat Security Advisory 2011:1371 :

Updated pidgin packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Pidgin is an instant messaging program which can log in to multiple accounts on multiple instant messaging networks simultaneously.

An input sanitization flaw was found in the way the Pidgin SILC (Secure Internet Live Conferencing) protocol plug-in escaped certain UTF-8 characters. A remote attacker could use this flaw to crash Pidgin via a specially crafted SILC message. (CVE-2011-3594)

Multiple NULL pointer dereference flaws were found in the way the Pidgin Yahoo! Messenger Protocol plug-in handled malformed YMSG packets. A remote attacker could use these flaws to crash Pidgin via a specially crafted notification message. (CVE-2011-1091)

Red Hat would like to thank the Pidgin project for reporting CVE-2011-1091. Upstream acknowledges Marius Wachtler as the original reporter of CVE-2011-1091.

All Pidgin users should upgrade to these updated packages, which contain backported patches to resolve these issues. Pidgin must be restarted for this update to take effect.

Pidgin is an instant messaging program which can log in to multiple accounts on multiple instant messaging networks simultaneously.

An input sanitization flaw was found in the way the Pidgin SILC (Secure Internet Live Conferencing) protocol plug-in escaped certain UTF-8 characters. A remote attacker could use this flaw to crash Pidgin via a specially crafted SILC message. (CVE-2011-3594)

Multiple NULL pointer dereference flaws were found in the way the Pidgin Yahoo! Messenger Protocol plug-in handled malformed YMSG packets. A remote attacker could use these flaws to crash Pidgin via a specially crafted notification message. (CVE-2011-1091)

All Pidgin users should upgrade to these updated packages, which contain backported patches to resolve these issues. Pidgin must be restarted for this update to take effect.

The remote host is affected by the vulnerability described in GLSA-201206-11 (Pidgin: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Pidgin. Please review       the CVE identifiers referenced below for details.
  Impact :

    These vulnerabilities allow for arbitrary file retrieval, Denial of       Service and arbitrary code execution with the privileges of the user       running Pidgin.
  Workaround :

    There is no known workaround at this time.

New release 2.10.1

Full Upstream ChangeLog :

http://developer.pidgin.im/wiki/ChangeLog

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The version of Pidgin installed on the remote host is earlier than 2.10.1 and is potentially affected by the following issues :

  - A failure to validate input during the processing of     UTF-8 SILC protocol messages can cause the application     to crash. (CVE-2011-3594, CVE-2011-4603)

  - A failure to validate input during the processing of     UTF-8 Oscar protocol buddy authorization request and     response messages can cause the application to crash.
    (CVE-2011-4601)

  - An error exists in the validation of voice and chat     messages in the XMPP protocol that can cause the     application to crash. (CVE-2011-4602)

This update fixes the following security issues :

  - 604225: MSN emoticon DoS. (CVE-2010-1624)

  - 648273: multiple NULL pointer dereference weaknesses.
    (CVE-2010-3711)

  - 722199: vulnerability in SILC protocol handling     (CVE-2011-3594)

Multiple vulnerabilities has been discovered and corrected in pidgin :

When receiving various stanzas related to voice and video chat, the XMPP protocol plugin failed to ensure that the incoming message contained all required fields, and would crash if certain fields were missing.

When receiving various messages related to requesting or receiving authorization for adding a buddy to a buddy list, the oscar protocol plugin failed to validate that a piece of text was UTF-8. In some cases invalid UTF-8 data would lead to a crash (CVE-2011-4601).

When receiving various incoming messages, the SILC protocol plugin failed to validate that a piece of text was UTF-8. In some cases invalid UTF-8 data would lead to a crash (CVE-2011-3594).

This update provides pidgin 2.10.1, which is not vulnerable to these issues.

Marius Wachtler discovered that Pidgin incorrectly handled malformed YMSG messages in the Yahoo! protocol handler. A remote attacker could send a specially crafted message and cause Pidgin to crash, leading to a denial of service. This issue only affected Ubuntu 10.04 LTS and 10.10. (CVE-2011-1091)

Marius Wachtler discovered that Pidgin incorrectly handled HTTP 100 responses in the MSN protocol handler. A remote attacker could send a specially crafted message and cause Pidgin to crash, leading to a denial of service. (CVE-2011-3184)

Diego Bauche Madero discovered that Pidgin incorrectly handled UTF-8 sequences in the SILC protocol handler. A remote attacker could send a specially crafted message and cause Pidgin to crash, leading to a denial of service. (CVE-2011-3594).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Updated pidgin packages that fix multiple security issues are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Pidgin is an instant messaging program which can log in to multiple accounts on multiple instant messaging networks simultaneously.

An input sanitization flaw was found in the way the Pidgin SILC (Secure Internet Live Conferencing) protocol plug-in escaped certain UTF-8 characters. A remote attacker could use this flaw to crash Pidgin via a specially crafted SILC message. (CVE-2011-3594)

Multiple NULL pointer dereference flaws were found in the way the Pidgin Yahoo! Messenger Protocol plug-in handled malformed YMSG packets. A remote attacker could use these flaws to crash Pidgin via a specially crafted notification message. (CVE-2011-1091)

Red Hat would like to thank the Pidgin project for reporting CVE-2011-1091. Upstream acknowledges Marius Wachtler as the original reporter of CVE-2011-1091.

All Pidgin users should upgrade to these updated packages, which contain backported patches to resolve these issues. Pidgin must be restarted for this update to take effect.

The remote Redhat Enterprise Linux 4 / 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2011:1371 advisory.

  - Pidgin: Multiple NULL pointer dereference flaws in Yahoo protocol plug-in (CVE-2011-1091)

  - libpurple: invalid UTF-8 string handling in SILC messages (CVE-2011-3594)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
75829	openSUSE Security Update : finch (openSUSE-SU-2011:1291-1)	Nessus	SuSE Local Security Checks	medium
75489	openSUSE Security Update : finch (openSUSE-SU-2011:1291-1)	Nessus	SuSE Local Security Checks	medium
74639	openSUSE Security Update : pidgin (openSUSE-2012-29)	Nessus	SuSE Local Security Checks	medium
74523	openSUSE Security Update : pidgin (openSUSE-2011-35)	Nessus	SuSE Local Security Checks	medium
68369	Oracle Linux 4 : pidgin (ELSA-2011-1371)	Nessus	Oracle Linux Local Security Checks	medium
61153	Scientific Linux Security Update : pidgin on SL4.x, SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	medium
59649	GLSA-201206-11 : Pidgin: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
57450	Fedora 15 : pidgin-2.10.1-1.fc15 (2011-17546)	Nessus	Fedora Local Security Checks	medium
57444	Fedora 16 : pidgin-2.10.1-1.fc16 (2011-17558)	Nessus	Fedora Local Security Checks	medium
57318	Pidgin < 2.10.1 Multiple Vulnerabilities	Nessus	Windows	medium
57186	SuSE 10 Security Update : pidgin, libpurple and finch (ZYPP Patch Number 7827)	Nessus	SuSE Local Security Checks	medium
57100	SuSE 11.1 Security Update : pidgin, libpurple and finch (SAT Patch Number 5389)	Nessus	SuSE Local Security Checks	medium
57099	SuSE 11.1 Security Update : pidgin, libpurple and finch (SAT Patch Number 5389)	Nessus	SuSE Local Security Checks	medium
57079	Mandriva Linux Security Advisory : pidgin (MDVSA-2011:183)	Nessus	Mandriva Local Security Checks	medium
56915	Ubuntu 10.04 LTS / 10.10 / 11.04 : pidgin vulnerabilities (USN-1273-1)	Nessus	Ubuntu Local Security Checks	medium
56514	CentOS 4 / 5 : pidgin (CESA-2011:1371)	Nessus	CentOS Local Security Checks	medium
56505	RHEL 4 / 5 : pidgin (RHSA-2011:1371)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2011-3594

high

Tenable Plugins

medium

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high