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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200511-07] OpenVPN: Multiple vulnerabilities

Vulnerability Assessment Details

[GLSA-200511-07] OpenVPN: Multiple vulnerabilities

Vulnerability Assessment Summary
OpenVPN: Multiple vulnerabilities

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200511-07
(OpenVPN: Multiple vulnerabilities)

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.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3393
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3409
http://openvpn.net/changelog.html

Solution:
All OpenVPN users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openvpn-2.0.4"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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