Unspecified vulnerability in Pidgin 2.6.0 allows remote attackers to cause a denial of service (crash) via a link in a Yahoo IM.

From Red Hat Security Advisory 2009:1218 :

Updated pidgin packages that fix a security issue are now available for Red Hat Enterprise Linux 3, 4, and 5.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

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

Federico Muttis of Core Security Technologies discovered a flaw in Pidgin's MSN protocol handler. If a user received a malicious MSN message, it was possible to execute arbitrary code with the permissions of the user running Pidgin. (CVE-2009-2694)

Note: Users can change their privacy settings to only allow messages from users on their buddy list to limit the impact of this flaw.

These packages upgrade Pidgin to version 2.5.9. Refer to the Pidgin release notes for a full list of changes:
http://developer.pidgin.im/wiki/ChangeLog

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

This update of pidgin fixes the following issues :

  - Allowed to send confidential data unencrypted even if     SSL was chosen by user. (CVE-2009-3026: CVSS v2 Base     Score: 5.0)

  - Remote denial of service in yahoo IM plug-in.
    (CVE-2009-3025: CVSS v2 Base Score: 4.3)

  - Remote denial of service in MSN plug-in. (CVE-2009-3083:
    CVSS v2 Base Score: 5.0)

  - Remote denial of service in MSN plug-in. (CVE-2009-3084:
    CVSS v2 Base Score: 5.0)

  - Remote denial of service in XMPP plug-in.
    (CVE-2009-3085: CVSS v2 Base Score: 5.0)

  - Remote denial of service in ICQ plug-in. (CVE-2009-3615:
    CVSS v2 Base Score: 5.0)

  - QQ protocol upgrade Migrate all QQ accounts to QQ2008.

This update of pidgin fixes the following issues :

  - CVE-2009-3026: CVSS v2 Base Score: 5.0 Allowed to send     confidential data unencrypted even if SSL was chosen by     user.

  - CVE-2009-3025: CVSS v2 Base Score: 4.3 Remote denial of     service in yahoo IM plug-in.

  - CVE-2009-3083: CVSS v2 Base Score: 5.0 Remote denial of     service in MSN plug-in.

  - CVE-2009-3084: CVSS v2 Base Score: 5.0 Remote denial of     service in MSN plug-in.

  - CVE-2009-3085: CVSS v2 Base Score: 5.0 Remote denial of     service in XMPP plug-in.

  - CVE-2009-3615: CVSS v2 Base Score: 5.0 Remote denial of     service in ICQ plug-in.

  - QQ protocol upgrade Migrate all QQ accounts to QQ2008.

Security vulnerabilities has been identified and fixed in pidgin :

The NSS plugin in libpurple in Pidgin 2.4.1 does not verify SSL certificates, which makes it easier for remote attackers to trick a user into accepting an invalid server certificate for a spoofed service. (CVE-2008-3532)

Pidgin 2.4.1 allows remote attackers to cause a denial of service (crash) via a long filename that contains certain characters, as demonstrated using an MSN message that triggers the crash in the msn_slplink_process_msg function. (CVE-2008-2955)

The UPnP functionality in Pidgin 2.0.0, and possibly other versions, allows remote attackers to trigger the download of arbitrary files and cause a denial of service (memory or disk consumption) via a UDP packet that specifies an arbitrary URL. (CVE-2008-2957)

Buffer overflow in the XMPP SOCKS5 bytestream server in Pidgin (formerly Gaim) before 2.5.6 allows remote authenticated users to execute arbitrary code via vectors involving an outbound XMPP file transfer. NOTE: some of these details are obtained from third-party information (CVE-2009-1373).

Buffer overflow in the decrypt_out function in Pidgin (formerly Gaim) before 2.5.6 allows remote attackers to cause a denial of service (application crash) via a QQ packet (CVE-2009-1374).

The PurpleCircBuffer implementation in Pidgin (formerly Gaim) before 2.5.6 does not properly maintain a certain buffer, which allows remote attackers to cause a denial of service (memory corruption and application crash) via vectors involving the (1) XMPP or (2) Sametime protocol (CVE-2009-1375).

Multiple integer overflows in the msn_slplink_process_msg functions in the MSN protocol handler in (1) libpurple/protocols/msn/slplink.c and (2) libpurple/protocols/msnp9/slplink.c in Pidgin (formerly Gaim) before 2.5.6 on 32-bit platforms allow remote attackers to execute arbitrary code via a malformed SLP message with a crafted offset value, leading to buffer overflows. NOTE: this issue exists because of an incomplete fix for CVE-2008-2927 (CVE-2009-1376).

The OSCAR protocol implementation in Pidgin before 2.5.8 misinterprets the ICQWebMessage message type as the ICQSMS message type, which allows remote attackers to cause a denial of service (application crash) via a crafted ICQ web message that triggers allocation of a large amount of memory (CVE-2009-1889).

The msn_slplink_process_msg function in libpurple/protocols/msn/slplink.c in libpurple, as used in Pidgin (formerly Gaim) before 2.5.9 and Adium 1.3.5 and earlier, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) by sending multiple crafted SLP (aka MSNSLP) messages to trigger an overwrite of an arbitrary memory location. NOTE: this issue reportedly exists because of an incomplete fix for CVE-2009-1376 (CVE-2009-2694).

Unspecified vulnerability in Pidgin 2.6.0 allows remote attackers to cause a denial of service (crash) via a link in a Yahoo IM (CVE-2009-3025)

protocols/jabber/auth.c in libpurple in Pidgin 2.6.0, and possibly other versions, does not follow the require TLS/SSL preference when connecting to older Jabber servers that do not follow the XMPP specification, which causes libpurple to connect to the server without the expected encryption and allows remote attackers to sniff sessions (CVE-2009-3026).

libpurple/protocols/irc/msgs.c in the IRC protocol plugin in libpurple in Pidgin before 2.6.2 allows remote IRC servers to cause a denial of service (NULL pointer dereference and application crash) via a TOPIC message that lacks a topic string (CVE-2009-2703).

The msn_slp_sip_recv function in libpurple/protocols/msn/slp.c in the MSN protocol plugin in libpurple in Pidgin before 2.6.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an SLP invite message that lacks certain required fields, as demonstrated by a malformed message from a KMess client (CVE-2009-3083).

The msn_slp_process_msg function in libpurple/protocols/msn/slpcall.c in the MSN protocol plugin in libpurple 2.6.0 and 2.6.1, as used in Pidgin before 2.6.2, allows remote attackers to cause a denial of service (application crash) via a handwritten (aka Ink) message, related to an uninitialized variable and the incorrect UTF16-LE charset name (CVE-2009-3084).

The XMPP protocol plugin in libpurple in Pidgin before 2.6.2 does not properly handle an error IQ stanza during an attempted fetch of a custom smiley, which allows remote attackers to cause a denial of service (application crash) via XHTML-IM content with cid: images (CVE-2009-3085).

This update provides pidgin 2.6.2, which is not vulnerable to these issues.

This update of pidgin fixes the following issues :

  - Allowed to send confidential data unencrypted even if     SSL was chosen by user. (CVE-2009-3026: CVSS v2 Base     Score: 5.0)

  - Remote denial of service in yahoo IM plug-in.
    (CVE-2009-3025: CVSS v2 Base Score: 4.3)

  - Remote denial of service in MSN plug-in. (CVE-2009-3083:
    CVSS v2 Base Score: 5.0)

  - Remote denial of service in MSN plug-in. (CVE-2009-3084:
    CVSS v2 Base Score: 5.0)

  - Remote denial of service in XMPP plug-in.
    (CVE-2009-3085: CVSS v2 Base Score: 5.0)

  - Remote denial of service in ICQ plug-in. (CVE-2009-3615:
    CVSS v2 Base Score: 5.0)

The version of Pidgin installed on the remote host is earlier than 2.6.1.  Such versions are reportedly affected by one or more of following issues :

  - The Yahoo protocol plugin may crash when receiving an IM     from any user that contains a URL. (CVE-2009-3025)

  - The XMPP protocol plugin can be tricked into establishing     an insecure connection by a malicious man-in-the-middle by     causing libpurple to use the older IQ-based login and then     not offering TLS/SSL. (CVE-2009-3026)

Security vulnerabilities has been identified and fixed in pidgin :

The msn_slplink_process_msg function in libpurple/protocols/msn/slplink.c in libpurple, as used in Pidgin (formerly Gaim) before 2.5.9 and Adium 1.3.5 and earlier, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) by sending multiple crafted SLP (aka MSNSLP) messages to trigger an overwrite of an arbitrary memory location. NOTE: this issue reportedly exists because of an incomplete fix for CVE-2009-1376 (CVE-2009-2694).

Unspecified vulnerability in Pidgin 2.6.0 allows remote attackers to cause a denial of service (crash) via a link in a Yahoo IM (CVE-2009-3025)

protocols/jabber/auth.c in libpurple in Pidgin 2.6.0, and possibly other versions, does not follow the require TLS/SSL preference when connecting to older Jabber servers that do not follow the XMPP specification, which causes libpurple to connect to the server without the expected encryption and allows remote attackers to sniff sessions (CVE-2009-3026).

libpurple/protocols/irc/msgs.c in the IRC protocol plugin in libpurple in Pidgin before 2.6.2 allows remote IRC servers to cause a denial of service (NULL pointer dereference and application crash) via a TOPIC message that lacks a topic string (CVE-2009-2703).

The msn_slp_sip_recv function in libpurple/protocols/msn/slp.c in the MSN protocol plugin in libpurple in Pidgin before 2.6.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an SLP invite message that lacks certain required fields, as demonstrated by a malformed message from a KMess client (CVE-2009-3083).

The msn_slp_process_msg function in libpurple/protocols/msn/slpcall.c in the MSN protocol plugin in libpurple 2.6.0 and 2.6.1, as used in Pidgin before 2.6.2, allows remote attackers to cause a denial of service (application crash) via a handwritten (aka Ink) message, related to an uninitialized variable and the incorrect UTF16-LE charset name (CVE-2009-3084).

The XMPP protocol plugin in libpurple in Pidgin before 2.6.2 does not properly handle an error IQ stanza during an attempted fetch of a custom smiley, which allows remote attackers to cause a denial of service (application crash) via XHTML-IM content with cid: images (CVE-2009-3085).

This update provides pidgin 2.6.2, which is not vulnerable to these issues.

The remote host is running Pidgin < 2.6.1. Such versions are potentially affected by multiple issues : 

  - A denial-of-service vulnerability because it fails to properly handle malformed links sent via the Yahoo Instant Messenger protocol. (CVE-2009-3025)

  - A man-in-the-middle vulnerability exists because the application does not require the TLS/SSL preference to be enabled when connecting to older Jabber servers. (CVE-2009-3026)

Updated pidgin packages that fix a security issue are now available for Red Hat Enterprise Linux 3, 4, and 5.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

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

Federico Muttis of Core Security Technologies discovered a flaw in Pidgin's MSN protocol handler. If a user received a malicious MSN message, it was possible to execute arbitrary code with the permissions of the user running Pidgin. (CVE-2009-2694)

Note: Users can change their privacy settings to only allow messages from users on their buddy list to limit the impact of this flaw.

These packages upgrade Pidgin to version 2.5.9. Refer to the Pidgin release notes for a full list of changes:
http://developer.pidgin.im/wiki/ChangeLog

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

ID	Name	Product	Family	Severity
67912	Oracle Linux 3 / 4 : pidgin (ELSA-2009-1218)	Nessus	Oracle Linux Local Security Checks	critical
51726	SuSE 10 Security Update : pidgin (ZYPP Patch Number 6710)	Nessus	SuSE Local Security Checks	medium
51725	SuSE 10 Security Update : pidgin (ZYPP Patch Number 6709)	Nessus	SuSE Local Security Checks	medium
43054	openSUSE Security Update : finch (finch-1625)	Nessus	SuSE Local Security Checks	medium
43052	openSUSE Security Update : finch (finch-1625)	Nessus	SuSE Local Security Checks	medium
43050	openSUSE Security Update : finch (finch-1625)	Nessus	SuSE Local Security Checks	medium
43024	Mandriva Linux Security Advisory : pidgin (MDVSA-2009:321)	Nessus	Mandriva Local Security Checks	critical
42989	SuSE 11 Security Update : pidgin (SAT Patch Number 1604)	Nessus	SuSE Local Security Checks	medium
40986	Pidgin < 2.6.1 Multiple Vulnerabilities	Nessus	Windows	medium
40966	Mandriva Linux Security Advisory : pidgin (MDVSA-2009:230)	Nessus	Mandriva Local Security Checks	critical
5168	Pidgin < 2.6.1 Multiple Vulnerabilities	Nessus Network Monitor	Internet Messengers	medium
40639	RHEL 3 / 4 / 5 : pidgin (RHSA-2009:1218)	Nessus	Red Hat Local Security Checks	critical
40625	CentOS 3 / 5 : pidgin (CESA-2009:1218)	Nessus	CentOS Local Security Checks	critical

Detections

Analytics

CVE-2009-3025

high

Tenable Plugins

critical

medium

medium

medium

medium

medium

critical

medium

medium

critical

medium

critical

critical