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TITLE:
pam-krb5 File Overwrite and Privilege Escalation

SECUNIA ADVISORY ID:
SA33914

VERIFY ADVISORY:
http://secunia.com/advisories/33914/

CRITICAL:
Less critical

IMPACT:
Manipulation of data, Privilege escalation

WHERE:
Local system

SOFTWARE:
pam-krb5 3.x
http://secunia.com/advisories/product/21379/

DESCRIPTION:
Some vulnerabilities have been reported in pam-krb5, which can be
exploited by malicious, local users to overwrite files and to gain
escalated privileges.

1) An error exists due to pam-krb5 not using the correct API for
initialising the Kerberos libraries in a setuid context. This can be
exploited to bypass authentication checks in setuid applications that
use PAM for authentication by specifying the Kerberos configuration
via environment variables.

2) An error exists in "pam_setcred" when being invoked with
"PAM_REINITIALIZE_CREDS" or "PAM_REFRESH_CREDS" by a setuid
application without first calling "PAM_ESTABLISH_CREDS" or dropping
privileges (e.g. "su" in Solaris 10). This can be exploited to
overwrite and chown a file specified via the "KRB5CCNAME" environment
variable.

The vulnerabilities are reported in versions prior to 3.13.

SOLUTION:
Update to version 3.13.

PROVIDED AND/OR DISCOVERED BY:
1) Reported by the vendor.
2) The vendor credits Derek Chan.

ORIGINAL ADVISORY:
http://www.eyrie.org/~eagle/software/pam-krb5/security/2009-02-11.html

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