GLSA 200903-39: pam_krb5: Privilege escalation

http://security.gentoo.org/

Severity:	high
Title:	pam_krb5: Privilege escalation
Date:	03/25/2009
Bugs:	#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	Vulnerable	Unaffected	Architecture(s)
sys-auth/pam_krb5	< 3.12	>= 3.12	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:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-auth/pam_krb5-3.12"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200903-39.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.