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Gentoo Linux Security Advisory                           GLSA 200411-07
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                                            https://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 answersto 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
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

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

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
https://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.

https://creativecommons.org/licenses/by-sa/1.0/