libpurple in Pidgin before 2.7.4 does not properly validate the return value of the purple_base64_decode function, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and application crash) via a crafted message, related to the plugins for MSN, MySpaceIM, XMPP, and Yahoo! and the NTLM authentication support.
developer.pidgin.im/viewmtn/revision/info/b01c6a1f7fe4d86b83f5f10917b3cb713989cfcc
lists.fedoraproject.org/pipermail/package-announce/2010-November/050227.html
lists.fedoraproject.org/pipermail/package-announce/2010-November/050695.html
lists.fedoraproject.org/pipermail/package-announce/2010-October/050133.html
pidgin.im/news/security/?id=48
secunia.com/advisories/41893
secunia.com/advisories/41899
secunia.com/advisories/42075
secunia.com/advisories/42294
securitytracker.com/id?1024623
slackware.com/security/viewer.php?l=slackware-security&y=2010&m=slackware-security.462352
www.mandriva.com/security/advisories?name=MDVSA-2010:208
www.osvdb.org/68773
www.redhat.com/support/errata/RHSA-2010-0788.html
www.redhat.com/support/errata/RHSA-2010-0890.html
www.securityfocus.com/bid/44283
www.ubuntu.com/usn/USN-1014-1
www.vupen.com/english/advisories/2010/2753
www.vupen.com/english/advisories/2010/2754
www.vupen.com/english/advisories/2010/2755
www.vupen.com/english/advisories/2010/2847
www.vupen.com/english/advisories/2010/2851
www.vupen.com/english/advisories/2010/2870
bugzilla.redhat.com/show_bug.cgi?id=641921
exchange.xforce.ibmcloud.com/vulnerabilities/62708
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18506