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Gentoo: LibAST Privilege escalation Print E-mail
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Posted by Benjamin D. Thomas   
Gentoo A buffer overflow in LibAST may result in execution of arbitrary code with escalated privileges.
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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@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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