kcheckpass passes a user-supplied argument to the pam_start function, often...

Vulnerability Description

kcheckpass passes a user-supplied argument to the pam_start function, often within a setuid environment, which allows local users to invoke any configured PAM stack, and possibly trigger unintended side effects, via an arbitrary valid PAM service name, a different vulnerability than CVE-2011-4122. NOTE: the vendor indicates that the possibility of resultant privilege escalation may be "a bit far-fetched."

References

• https://exchange.xforce.ibmcloud.com/vulnerabilities/72230
• http://openwall.com/lists/oss-security/2011/12/07/3
• http://openwall.com/lists/oss-security/2011/12/28/5
• http://openwall.com/lists/oss-security/2011/12/27/3
• http://openwall.com/lists/oss-security/2011/12/23/8
• http://openwall.com/lists/oss-security/2012/01/02/11
• http://openwall.com/lists/oss-security/2011/12/27/1
• http://c-skills.blogspot.com/2011/11/openpam-trickery.html
• http://openwall.com/lists/oss-security/2011/12/08/9
• http://openwall.com/lists/oss-security/2012/01/02/10