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Gentoo Linux Security Advisory                           GLSA 200411-33
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                                             http://security.gentoo.org/
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  Severity: High
     Title: TWiki: Arbitrary command execution
      Date: November 24, 2004
      Bugs: #71035
        ID: 200411-33

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Synopsis
========

A bug in the TWiki search function allows an attacker to execute
arbitrary commands with the permissions of the user running TWiki.

Background
==========

TWiki is a Web-based groupware tool based around the concept of wiki
pages that can be edited by anybody with a Web browser.

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

    -------------------------------------------------------------------
     Package         /   Vulnerable   /                     Unaffected
    -------------------------------------------------------------------
  1  www-apps/twiki      < 20040902                       >= 20040902

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

The TWiki search function, which uses a shell command executed via the
Perl backtick operator, does not properly escape shell metacharacters
in the user-provided search string.

Impact
======

An attacker can insert malicious commands into a search request,
allowing the execution of arbitrary commands with the privileges of the
user running TWiki (usually the Web server user).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All TWiki users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=www-apps/twiki-20040902"

References
==========

  [ 1 ] TWiki Security Alert
         http://twiki.org/cgi-bin/view/Codev/SecurityAlertExecuteCommandsWithSearch
  [ 2 ] CAN-2004-1037
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1037

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

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

   http://security.gentoo.org/glsa/glsa-200411-33.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/2.0