medium
4.3
CWE
NVD-CWE-Other 476
Advisory Published
CVE Published
Updated

CVE-2011-2943: Null Pointer Dereference

First published: Mon Jul 18 2011(Updated: )

A NULL pointer dereference flaw was found in the way IRC protocol plug-in of the Pidgin multiprotocol instant messaging client processed certain nick names, when list set of users (/who command) was issued upon user session startup and connecting user has had certain encoding configuration setup. A remote attacker could use a specially-crafted string as their nickname to cause the Pidgin client on the side of the victim (connecting user) to crash. Upstream bug report: [1] <a href="http://developer.pidgin.im/ticket/14341">http://developer.pidgin.im/ticket/14341</a> Acknowledgements: Red Hat would like to thank the Pidgin project for reporting this issue.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Libpurple=2.8.0
Libpurple=2.9.0
Pidgin<=2.9.0
Pidgin=2.0.0
Pidgin=2.0.1
Pidgin=2.0.2
Pidgin=2.1.0
Pidgin=2.1.1
Pidgin=2.2.0
Pidgin=2.2.1
Pidgin=2.2.2
Pidgin=2.3.0
Pidgin=2.3.1
Pidgin=2.4.0
Pidgin=2.4.1
Pidgin=2.4.2
Pidgin=2.4.3
Pidgin=2.5.0
Pidgin=2.5.1
Pidgin=2.5.2
Pidgin=2.5.3
Pidgin=2.5.4
Pidgin=2.5.5
Pidgin=2.5.6
Pidgin=2.5.7
Pidgin=2.5.8
Pidgin=2.5.9
Pidgin=2.6.0
Pidgin=2.6.1
Pidgin=2.6.2
Pidgin=2.6.4
Pidgin=2.6.5
Pidgin=2.6.6
Pidgin=2.7.0
Pidgin=2.7.1
Pidgin=2.7.2
Pidgin=2.7.3
Pidgin=2.7.4
Pidgin=2.7.5
Pidgin=2.7.6
Pidgin=2.7.7
Pidgin=2.7.8
Pidgin=2.7.9
Pidgin=2.7.10
Pidgin=2.7.11
Pidgin=2.8.0

Remedy

http://developer.pidgin.im/viewmtn/revision/diff/5749f9193063800d27bef75c2388f6f9cc2f7f37/with/5c2dba4a7e2e76b76e7f472b88953a4316706d43/libpurple/protocols/irc/msgs.c

Remedy

http://developer.pidgin.im/viewmtn/revision/info/5c2dba4a7e2e76b76e7f472b88953a4316706d43

Remedy

http://pidgin.im/news/security/?id=53

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-2943?

    CVE-2011-2943 is classified as a moderate severity vulnerability due to the potential for denial of service via NULL pointer dereference.

  • How do I fix CVE-2011-2943?

    To fix CVE-2011-2943, upgrade your Pidgin client to versions 2.8.0 or later, which have addressed the vulnerability.

  • Which versions of Pidgin are affected by CVE-2011-2943?

    CVE-2011-2943 affects all Pidgin versions up to and including 2.9.0.

  • What type of vulnerability is CVE-2011-2943?

    CVE-2011-2943 is a NULL pointer dereference vulnerability specifically found in the IRC protocol plugin of Pidgin.

  • When was CVE-2011-2943 disclosed?

    CVE-2011-2943 was disclosed on August 22, 2011.

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