The msn_httpconn_parse_data function in httpconn.c in the MSN protocol plugin in libpurple in Pidgin before 2.10.0 does not properly handle HTTP 100 responses, which allows remote attackers to cause a denial of service (incorrect memory access and application crash) via vectors involving a crafted server message.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18284
https://exchange.xforce.ibmcloud.com/vulnerabilities/69341
https://bugzilla.redhat.com/show_bug.cgi?id=732405
http://www.securityfocus.com/bid/49268
http://www.openwall.com/lists/oss-security/2011/08/22/7
http://www.openwall.com/lists/oss-security/2011/08/22/4
http://www.openwall.com/lists/oss-security/2011/08/22/12
http://www.openwall.com/lists/oss-security/2011/08/22/10
http://securitytracker.com/id?1025961
http://secunia.com/advisories/45916
http://secunia.com/advisories/45663
http://pidgin.im/news/security/?id=54
http://lists.fedoraproject.org/pipermail/package-announce/2011-September/065190.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-August/064943.html
http://developer.pidgin.im/viewmtn/revision/info/16af0661899a978b4fedc1c165965b85009013d1