Mandriva Linux Security Advisory – A format string vulnerability in the grant helper, in PolicyKit 0.7 and earlier, allows attackers to cause a denial of service (crash) and possibly execute arbitrary code via format strings in a password.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/65593/MDVSA-2008-087.txt
Source: https://packetstormsecurity.com/files/65593/Mandriva-Linux-Security-Advisory-2008-087.html