GLSA 200411-07: Proxytunnel: Format string vulnerability

http://security.gentoo.org/

Severity:	normal
Title:	Proxytunnel: Format string vulnerability
Date:	11/03/2004
Bugs:	#69379
ID:	200411-07

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	Architecture(s)
net-misc/proxytunnel	< 1.2.3	>= 1.2.3	All supported architectures

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

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 https://bugs.gentoo.org.