[Full-disclosure] [ GLSA 200610-03 ] ncompress: Buffer Underflow

[Raphael Marichez]

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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 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/2.5

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