[ GLSA 200511-07 ] OpenVPN: Multiple vulnerabilities

[GLSA]

Gentoo Linux Security Advisory

Title: OpenVPN: Multiple vulnerabilities (GLSA 200511-07)
Severity: normal
Exploitable: remote
Date: November 06, 2005
Bug(s): #111116
ID: 200511-07

Synopsis


The OpenVPN client is potentially vulnerable to the execution of arbitrary
code and the OpenVPN server is vulnerable to a Denial of Service issue.


Background


OpenVPN is a multi-platform, full-featured SSL VPN solution.


Affected Packages

Package: net-misc/openvpn
Vulnerable: < 2.0.4
Unaffected: >= 2.0.4
Architectures: All supported architectures


Description


The OpenVPN client contains a format string bug in the handling of
the foreign_option in options.c. Furthermore, when the OpenVPN server
runs in TCP mode, it may dereference a NULL pointer under specific
error conditions.


Impact


A remote attacker could setup a malicious OpenVPN server and trick
the user into connecting to it, potentially executing arbitrary code on
the client's computer. A remote attacker could also exploit the NULL
dereference issue by sending specific packets to an OpenVPN server
running in TCP mode, resulting in a Denial of Service condition.


Workaround


Do not use "pull" or "client" options in the OpenVPN client
configuration file, and use UDP mode for the OpenVPN server.


Resolution


All OpenVPN users should upgrade to the latest version: