Mandriva Linux Security Advisory – A flaw in opal, the Open Phone Abstraction Library, was found in how it handles certain Session Initiation Protocol (SIP) packets. An attacker could use this vulnerability to crash an application linked to opal, such as Ekiga.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/60646/MDKSA-2007-205.txt
Source: https://packetstormsecurity.com/files/60646/Mandriva-Linux-Security-Advisory-2007.205.html