[ GLSA 201201-15 ] ktsuss: Privilege escalation

[Sean Amoss <ackle () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 201201-15
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                                            http://security.gentoo.org/
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 Severity: High
    Title: ktsuss: Privilege escalation
     Date: January 27, 2012
     Bugs: #381115
       ID: 201201-15

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Synopsis
========

Two vulnerabilities have been found in ktsuss, allowing local attackers
to gain escalated privileges.

Background
==========

ktsuss is a simple, graphical version of su written in C and GTK+.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  x11-misc/ktsuss               <= 1.4                  Vulnerable!
    -------------------------------------------------------------------
     NOTE: Certain packages are still vulnerable. Users should migrate
           to another package if one is available or wait for the
           existing packages to be marked stable by their
           architecture maintainers.

Description
===========

Two vulnerabilities have been found in ktuss:

* Under specific circumstances, ktsuss skips authentication and fails
  to change the effective UID back to the real UID (CVE-2011-2921).
* The GTK interface spawned by the ktsuss binary is run as root
  (CVE-2011-2922).

Impact
======

A local attacker could gain escalated privileges and use the
"GTK_MODULES" environment variable to possibly execute arbitrary code
with root privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

Gentoo discontinued support for ktsuss. We recommend that users unmerge
ktsuss:

  # emerge --unmerge "x11-misc/ktsuss"

References
==========

[ 1 ] CVE-2011-2921
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2921
[ 2 ] CVE-2011-2922
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-2922

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 http://security.gentoo.org/glsa/glsa-201201-15.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.

License
=======

Copyright 2012 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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