full-disclosure - [ GLSA 200903-39 ] pam_krb5: Privilege escalation

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Message-ID: <49CAB3FD.5020509@gentoo.org>
Date: Wed, 25 Mar 2009 23:45:17 +0100
From: Pierre-Yves Rofes <py@...too.org>
To: gentoo-announce@...too.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200903-39 ] pam_krb5: Privilege escalation

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Gentoo Linux Security Advisory                           GLSA 200903-39
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                                            http://security.gentoo.org/
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  Severity: High
     Title: pam_krb5: Privilege escalation
      Date: March 25, 2009
      Bugs: #257075
        ID: 200903-39

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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
    -------------------------------------------------------------------
  1  sys-auth/pam_krb5       < 3.12                            >= 3.12

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
==========

  [ 1 ] CVE-2009-0360
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0360
  [ 2 ] CVE-2009-0361
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0361

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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

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