The pidgin_conv_chat_rename_user function in gtkconv.c in Pidgin before 2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by changing a nickname while in an XMPP chat room.

Multiple vulnerabilities has been discovered and corrected in pidgin :

The pidgin_conv_chat_rename_user function in gtkconv.c in Pidgin before 2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by changing a nickname while in an XMPP chat room (CVE-2011-4939).

The msn_oim_report_to_user function in oim.c in the MSN protocol plugin in libpurple in Pidgin before 2.10.2 allows remote servers to cause a denial of service (application crash) via an OIM message that lacks UTF-8 encoding (CVE-2012-1178).

This update provides pidgin 2.10.2, which is not vulnerable to these issues.

Evgeny Boger discovered that Pidgin incorrectly handled buddy list messages in the AIM and ICQ protocol handlers. 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, 11.04 and 11.10. (CVE-2011-4601)

Thijs Alkemade discovered that Pidgin incorrectly handled malformed voice and video chat requests in the XMPP 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, 11.04 and 11.10. (CVE-2011-4602)

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. This issue only affected Ubuntu 10.04 LTS, 11.04 and 11.10. (CVE-2011-4603)

Julia Lawall discovered that Pidgin incorrectly cleared memory contents used in cryptographic operations. An attacker could exploit this to read the memory contents, leading to an information disclosure. This issue only affected Ubuntu 10.04 LTS. (CVE-2011-4922)

Clemens Huebner and Kevin Stange discovered that Pidgin incorrectly handled nickname changes inside chat rooms in the XMPP protocol handler. A remote attacker could exploit this by changing nicknames, leading to a denial of service. This issue only affected Ubuntu 11.10.
(CVE-2011-4939)

Thijs Alkemade discovered that Pidgin incorrectly handled off-line instant messages 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. This issue only affected Ubuntu 10.04 LTS, 11.04 and 11.10. (CVE-2012-1178)

Jose Valentin Gutierrez discovered that Pidgin incorrectly handled SOCKS5 proxy connections during file transfer requests in the XMPP protocol handler. A remote attacker could send a specially crafted request and cause Pidgin to crash, leading to a denial of service.
This issue only affected Ubuntu 12.04 LTS and 11.10. (CVE-2012-2214)

Fabian Yamaguchi discovered that Pidgin incorrectly handled malformed messages 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-2012-2318)

Ulf Harnhammar discovered that Pidgin incorrectly handled messages with in-line images in the MXit protocol handler. A remote attacker could send a specially crafted message and possibly execute arbitrary code with user privileges. (CVE-2012-3374).

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.

The version of Pidgin installed on the remote host is earlier than 2.10.2 and is potentially affected by the following issues :

  - A denial of service vulnerability (NULL pointer     dereference) in the 'pidgin_conv_chat_rename_user'     function in 'gtkconv.c'. Remote attackers can trigger     the vulnerability by performing certain types of     nickname changes while in an XMPP chat room.     (CVE-2011-4939)

  - The msn_oim_report_to_user function in oim.c allows     remote servers to cause an application crash by     sending an OIM message without UTF-8 encoding.     (CVE-2012-1178)

ID	Name	Product	Family	Severity
61945	Mandriva Linux Security Advisory : pidgin (MDVSA-2012:029)	Nessus	Mandriva Local Security Checks	medium
59903	Ubuntu 10.04 LTS / 11.04 / 11.10 / 12.04 LTS : pidgin vulnerabilities (USN-1500-1)	Nessus	Ubuntu Local Security Checks	high
58410	Pidgin < 2.10.2 Multiple DoS	Nessus	Windows	medium

Detections

Analytics

CVE-2011-4939

high

Tenable Plugins

medium

high

medium