The printf wrappers in libsafe 2.0-11 and earlier do not properly handle argument indexing specifiers, which could allow attackers to exploit certain function calls through arguments that are not verified by libsafe.
http://www.securityfocus.com/bid/4327
http://www.linux-mandrake.com/en/security/2002/MDKSA-2002-026.php
http://www.iss.net/security_center/static/8594.php
http://archives.neohapsis.com/archives/vulnwatch/2002-q1/0070.html