bugtraq - [ GLSA 200509-09 ] Py2Play: Remote execution of arbitrary Python code

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Date: Sat, 17 Sep 2005 14:04:32 +0200
From: Thierry Carrez <koon@...too.org>
To: gentoo-announce@...ts.gentoo.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200509-09 ] Py2Play: Remote execution of
 arbitrary Python code

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Gentoo Linux Security Advisory                           GLSA 200509-09
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Py2Play: Remote execution of arbitrary Python code
      Date: September 17, 2005
      Bugs: #103524
        ID: 200509-09

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Synopsis
========

A design error in Py2Play allows attackers to execute arbitrary code.

Background
==========

Py2Play is a peer-to-peer network game engine written in Python.
Pickling is a Python feature allowing to serialize Python objects into
string representations (called pickles) that can be sent over the
network.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  dev-python/py2play      <= 0.1.7                      Vulnerable!
    -------------------------------------------------------------------
     NOTE: Certain packages are still vulnerable. Users should migrate
           to another package if one is available or wait for the
           existing packages to be marked stable by their
           architecture maintainers.

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

Arc Riley discovered that Py2Play uses Python pickles to send objects
over a peer-to-peer game network, and that clients accept without
restriction the objects and code sent by peers.

Impact
======

A remote attacker participating in a Py2Play-powered game can send
malicious Python pickles, resulting in the execution of arbitrary
Python code on the targeted game client.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

The Py2Play package has been hard-masked prior to complete removal from
Portage, and current users are advised to unmerge the package:

    # emerge --unmerge  dev-python/py2play

References
==========

  [ 1 ] CAN-2005-2875
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2875

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

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

  http://security.gentoo.org/glsa/glsa-200509-09.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@...too.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2005 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

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