GLSA 200411-07: Proxytunnel: Format string vulnerability
Posted on: 11/04/2004 11:21 AM

A Proxytunnel security update is available for Gentoo Linux

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

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Package / Vulnerable / Unaffected
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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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