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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
[email protected] 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