[ GLSA 200411-07 ] Proxytunnel: Format string vulnerability

[GLSA]

Gentoo Linux Security Advisory

Title: Proxytunnel: Format string vulnerability (GLSA 200411-07)
Severity: normal
Exploitable: remote
Date: November 03, 2004
Bug(s): #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: net-misc/proxytunnel
Vulnerable: < 1.2.3
Unaffected: >= 1.2.3
Architectures: 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: