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.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9076
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17599
http://www.ubuntu.com/usn/USN-675-1
http://www.securityfocus.com/bid/29985
http://www.redhat.com/support/errata/RHSA-2008-1023.html
http://www.openwall.com/lists/oss-security/2008/06/27/3
http://www.mandriva.com/security/advisories?name=MDVSA-2009:025
http://support.avaya.com/elmodocs2/security/ASA-2008-493.htm
http://secunia.com/advisories/33102