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.
https://rhn.redhat.com/errata/RHSA-2009-1218.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6320
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10319
https://bugzilla.redhat.com/show_bug.cgi?id=514957
http://www.vupen.com/english/advisories/2009/2663
http://www.vupen.com/english/advisories/2009/2303
http://www.pidgin.im/news/security/?id=34
http://www.exploit-db.com/exploits/9615
http://www.debian.org/security/2009/dsa-1870
http://sunsolve.sun.com/search/document.do?assetkey=1-66-266908-1
http://secunia.com/advisories/37071
http://secunia.com/advisories/36708
http://secunia.com/advisories/36402
http://secunia.com/advisories/36401
http://secunia.com/advisories/36392
http://secunia.com/advisories/36384
http://developer.pidgin.im/wiki/ChangeLog
http://developer.pidgin.im/viewmtn/revision/info/6f7343166c673bf0496ecb1afec9b633c1d54a0e