Russ Allbery pam-krb5 before 3.13, when linked against MIT Kerberos, does not properly initialize the Kerberos libraries for setuid use, which allows local users to gain privileges by pointing an environment variable to a modified Kerberos configuration file, and then launching a PAM-based setuid application.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5732
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5669
http://www.vupen.com/english/advisories/2009/0979
http://www.vupen.com/english/advisories/2009/0426
http://www.vupen.com/english/advisories/2009/0410
http://www.ubuntu.com/usn/USN-719-1
http://www.securityfocus.com/bid/33740
http://www.securityfocus.com/archive/1/500892/100/0/threaded
http://www.eyrie.org/~eagle/software/pam-krb5/security/2009-02-11.html
http://www.debian.org/security/2009/dsa-1721
http://support.avaya.com/elmodocs2/security/ASA-2009-070.htm
http://sunsolve.sun.com/search/document.do?assetkey=1-66-252767-1
http://securitytracker.com/id?1021711
http://security.gentoo.org/glsa/glsa-200903-39.xml
http://secunia.com/advisories/34449
http://secunia.com/advisories/34260