[ GLSA 200903-39 ] pam_krb5: Privilege escalation

[GLSA]

Gentoo Linux Security Advisory

Title: pam_krb5: Privilege escalation (GLSA 200903-39)
Severity: high
Exploitable: local
Date: March 25, 2009
Bug(s): #257075
ID: 200903-39

Synopsis

Two vulnerabilities in pam_krb5 might allow local users to elevate their privileges or overwrite arbitrary files.

Background

pam_krb5 is a a Kerberos v5 PAM module.

Affected Packages

Package: sys-auth/pam_krb5
Vulnerable: < 3.12
Unaffected: >= 3.12
Architectures: All supported architectures


Description

The following vulnerabilities were discovered:

• pam_krb5 does not properly initialize the Kerberos libraries for setuid use (CVE-2009-0360).
• Derek Chan reported that calls to pam_setcred() are not properly handled when running setuid (CVE-2009-0361).

Impact

A local attacker could set an environment variable to point to a specially crafted Kerberos configuration file and launch a PAM-based setuid application to elevate privileges, or change ownership and overwrite arbitrary files.

Workaround

There is no known workaround at this time.

Resolution

All pam_krb5 users should upgrade to the latest version: