[ GLSA 200411-07 ] Proxytunnel: Format string vulnerability

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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_at_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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