[Full-disclosure] [ GLSA 200601-14 ] LibAST: Privilege escalation

[Sune Kloppenborg Jeppesen]

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Gentoo Linux Security Advisory                           GLSA 200601-14
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                                            http://security.gentoo.org/
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  Severity: High
     Title: LibAST: Privilege escalation
      Date: January 29, 2006
      Bugs: #120106
        ID: 200601-14

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Synopsis
========

A buffer overflow in LibAST may result in execution of arbitrary code
with escalated privileges.

Background
==========

LibAST is a utility library that was originally intended to accompany
Eterm, but may be used by various other applications.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  x11-libs/libast        < 0.7                               >= 0.7

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

Michael Jennings discovered an exploitable buffer overflow in the
configuration engine of LibAST.

Impact
======

The vulnerability can be exploited to gain escalated privileges if the
application using LibAST is setuid/setgid and passes a specifically
crafted filename to LibAST's configuration engine.

Workaround
==========

Identify all applications linking against LibAST and verify they are
not setuid/setgid.

Resolution
==========

All users should upgrade to the latest version and run revdep-rebuild:

    # emerge --sync
    # emerge --ask --oneshot --verbose >=x11-libs/libast-0.7
    # revdep-rebuild

References
==========

  [ 1 ] CVE-2006-0224
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0224

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

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

  http://security.gentoo.org/glsa/glsa-200601-14.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 at gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2006 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/2.0
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