A new security update has been released for Gentoo Linux - Pidgin: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200901-13
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http://security.gentoo.org/
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Severity: Normal
Title: Pidgin: Multiple vulnerabilities
Date: January 20, 2009
Bugs: #230045, #234135
ID: 200901-13

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Synopsis
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Multiple vulnerabilities have been discovered in Pidgin, allowing for
remote arbitrary code execution, Denial of Service and service
spoofing.

Background
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Pidgin (formerly Gaim) is an instant messaging client for a variety of
instant messaging protocols. It is based on the libpurple instant
messaging library.

Affected packages
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Package / Vulnerable / Unaffected
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1 net-im/pidgin < 2.5.1 >=3D 2.5.1

Description
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Multiple vulnerabilities have been discovered in Pidgin and the
libpurple library:

* A participant to the TippingPoint ZDI reported multiple integer
overflows in the msn_slplink_process_msg() function in the MSN
protocol implementation (CVE-2008-2927).

* Juan Pablo Lopez Yacubian is credited for reporting a
use-after-free flaw in msn_slplink_process_msg() in the MSN protocol
implementation (CVE-2008-2955).

* The included UPnP server does not limit the size of data to be
downloaded for UPnP service discovery, according to a report by
Andrew Hunt and Christian Grothoff (CVE-2008-2957).

* Josh Triplett discovered that the NSS plugin for libpurple does not
properly verify SSL certificates (CVE-2008-3532).

Impact
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A remote attacker could send specially crafted messages or files using
the MSN protocol which could result in the execution of arbitrary code
or crash Pidgin. NOTE: Successful exploitation might require the
victim's interaction. Furthermore, an attacker could conduct
man-in-the-middle attacks to obtain sensitive information using bad
certificates and cause memory and disk resources to exhaust.

Workaround
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There is no known workaround at this time.

Resolution
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All Pidgin users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dnet-im/pidgin-2.5.1"

References
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[ 1 ] CVE-2008-2927
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2927
[ 2 ] CVE-2008-2955
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2955
[ 3 ] CVE-2008-2957
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2957
[ 4 ] CVE-2008-3532
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3532

Availability
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This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200901-13.xml

Concerns?
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Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
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Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5