=====================================================================
                                  CERT-Renater

                       Note d'Information No. 2004/VULN502
_____________________________________________________________________

DATE                      : 23/11/2004

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running UNARJ.

======================================================================

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200411-29
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                             http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

   Severity: Normal
      Title: unarj: Long filenames buffer overflow and a path traversal
             vulnerability
       Date: November 19, 2004
       Bugs: #70966
         ID: 200411-29

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

unarj contains a buffer overflow and a directory traversal
vulnerability. This could lead to overwriting of arbitrary files or
the execution of arbitrary code.

Background
==========

unarj is an ARJ archive decompressor.

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

     -------------------------------------------------------------------
      Package         /  Vulnerable  /                       Unaffected
     -------------------------------------------------------------------
   1  app-arch/unarj     < 2.63a-r2                         >= 2.63a-r2

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

unarj has a bounds checking vulnerability within the handling of long
filenames in archives. It also fails to properly sanitize paths when
extracting an archive (if the "x" option is used to preserve paths).

Impact
======

An attacker could trigger a buffer overflow or a path traversal by
enticing a user to open an archive containing specially-crafted path
names, potentially resulting in the overwrite of files or execution of
arbitrary code with the permissions of the user running unarj.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All unarj users should upgrade to the latest version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=app-arch/unarj-2.63a-r2"

References
==========

   [ 1 ] CAN-2004-0947
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0947
   [ 2 ] CAN-2004-1027
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1027

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

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

   http://security.gentoo.org/glsa/glsa-200411-29.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.

======================================================================

         =========================================================
         Les serveurs de référence du CERT-Renater
         http://www.urec.fr/securite
         http://www.cru.fr/securite
         http://www.renater.fr
         =========================================================
         + CERT-RENATER          | tel : 01-53-94-20-44          +
         + 151 bd de l'Hopital   | fax : 01-53-94-20-41          +
         + 75013 Paris           | email: certsvp@renater.fr     +
         =========================================================