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Gentoo Linux Security Advisory                           GLSA 200610-03
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: ncompress: Buffer Underflow
      Date: October 06, 2006
      Bugs: #141728
        ID: 200610-03

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Synopsis
========

A buffer underflow vulnerability has been reported in ncompress
allowing for the execution of arbitrary code.

Background
==========

ncompress is a suite of utilities to create and extract
Lempel-Ziff-Welch (LZW) compressed archives.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  app-arch/ncompress      < 4.2.4.1                      >= 4.2.4.1

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

Tavis Ormandy of the Google Security Team discovered a static buffer
underflow in ncompress.

Impact
======

An attacker could create a specially crafted LZW archive, that when
decompressed by a user or automated system would result in the
execution of arbitrary code with the permissions of the user invoking
the utility.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ncompress users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-arch/ncompress-4.2.4.1"

References
==========

  [ 1 ] CVE-2006-1168
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1168

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

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

  http://security.gentoo.org/glsa/glsa-200610-03.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/2.5