[ GLSA 200411-07 ] Proxytunnel: Format string vulnerability

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200411-07
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Proxytunnel: Format string vulnerability
      Date: November 03, 2004
      Bugs: #69379
        ID: 200411-07

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Synopsis
========

Proxytunnel is vulnerable to a format string vulnerability, potentially
allowing a remote server to execute arbitrary code with the rights of
the Proxytunnel process.

Background
==========

Proxytunnel is a program that tunnels connections to a remote server
through a standard HTTPS proxy.

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

    -------------------------------------------------------------------
     Package               /  Vulnerable  /                 Unaffected
    -------------------------------------------------------------------
  1  net-misc/proxytunnel       < 1.2.3                       >= 1.2.3

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

Florian Schilhabel of the Gentoo Linux Security Audit project found a
format string vulnerability in Proxytunnel. When the program is started
in daemon mode (-a [port]), it improperly logs invalid proxy answers to
syslog.

Impact
======

A malicious remote server could send specially-crafted invalid answers
to exploit the format string vulnerability, potentially allowing the
execution of arbitrary code on the tunnelling host with the rights of
the Proxytunnel process.

Workaround
==========

You can mitigate the issue by only allowing connections to trusted
remote servers.

Resolution
==========

All Proxytunnel users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/proxytunnel-1.2.3"

References
==========

  [ 1 ] CAN-2004-0992
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0992
  [ 2 ] Proxytunnel News
        http://proxytunnel.sourceforge.net/news.html

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

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

  http://security.gentoo.org/glsa/glsa-200411-07.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

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