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Gentoo Linux Security Advisory                           GLSA 200410-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: sharutils: Buffer overflows in shar.c and unshar.c
      Date: October 01, 2004
      Bugs: #65773
        ID: 200410-01

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Synopsis
========

sharutils contains two buffer overflow vulnerabilities that could lead
to arbitrary code execution.

Background
==========

sharutils contains utilities to manage shell archives.

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

    -------------------------------------------------------------------
     Package             /   Vulnerable   /                 Unaffected
    -------------------------------------------------------------------
  1  app-arch/sharutils      <= 4.2.1-r9                  >= 4.2.1-r10

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

sharutils contains two buffer overflows. Ulf Harnhammar discovered a
buffer overflow in shar.c, where the length of data returned by the wc
command is not checked. Florian Schilhabel discovered another buffer
overflow in unshar.c.

Impact
======

An attacker could exploit these vulnerabilities to execute arbitrary
code as the user running one of the sharutils programs.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All sharutils users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=app-arch/sharutils-4.2.1-r10"
    # emerge ">=app-arch/sharutils-4.2.1-r10"

References
==========

  [ 1 ] Debian Bug #265904
        http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=265904

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

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

  http://security.gentoo.org/glsa/glsa-200410-01.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 2004 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/1.0