CVE-2014-3694

The (1) bundled GnuTLS SSL/TLS plugin and the (2) bundled OpenSSL SSL/TLS plugin in libpurple in Pidgin before 2.10.10 do not properly consider the Basic Constraints extension during verification of X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

In Pidgin before 2.10.10, both of libpurple's bundled SSL/TLS plugins (one for GnuTLS and one for NSS) failed to check that the Basic Constraints extension allowed intermediate certificates to act as CAs. This allowed anyone with any valid certificate to create a fake certificate for any arbitrary domain and Pidgin would trust it (CVE-2014-3694).

In Pidgin before 2.10.10, a malicious server or man-in-the-middle could trigger a crash in libpurple by sending an emoticon with an overly large length value (CVE-2014-3695).

In Pidgin before 2.10.10, a malicious server or man-in-the-middle could trigger a crash in libpurple by specifying that a large amount of memory should be allocated in many places in the UI (CVE-2014-3696).

In Pidgin before 2.10.10, a malicious server and possibly even a malicious remote user could create a carefully crafted XMPP message that causes libpurple to send an XMPP message containing arbitrary memory (CVE-2014-3698).

The pidgin package has been updated to version 2.10.10 which fixes these issues and other bugs.

These are all security issues fixed in the finch-2.11.0-4.1 package on the GA media of openSUSE Tumbleweed.

The (1) bundled GnuTLS SSL/TLS plugin and the (2) bundled OpenSSL SSL/TLS plugin in libpurple in Pidgin before 2.10.10 do not properly consider the Basic Constraints extension during verification of X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.

Jacob Appelbaum and an anonymous person discovered that Pidgin incorrectly handled certificate validation. A remote attacker could exploit this to perform a machine-in-the-middle attack to view sensitive information or alter encrypted communications. (CVE-2014-3694)

Yves Younan and Richard Johnson discovered that Pidgin incorrectly handled certain malformed MXit emoticons. A malicious remote server or a machine-in-the-middle could use this issue to cause Pidgin to crash, resulting in a denial of service. (CVE-2014-3695)

Yves Younan and Richard Johnson discovered that Pidgin incorrectly handled certain malformed Groupwise messages. A malicious remote server or a machine-in-the-middle could use this issue to cause Pidgin to crash, resulting in a denial of service. (CVE-2014-3696)

Thijs Alkemade and Paul Aurich discovered that Pidgin incorrectly handled memory when processing XMPP messages. A malicious remote server or user could use this issue to cause Pidgin to disclosure arbitrary memory, resulting in an information leak. (CVE-2014-3698)