Ubuntu 7.04 / 7.10 / 8.04 LTS : openvpn regression (USN-612-6)

Ubuntu Security Notice (C) 2008-2013 Canonical, Inc. / NASL script (C) 2008-2013 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related patches.

Description :

USN-612-3 addressed a weakness in OpenSSL certificate and keys
generation in OpenVPN by adding checks for vulnerable certificates and
keys to OpenVPN. A regression was introduced in OpenVPN when using
TLS, multi-client/server mode, and specifying a user or group which
caused OpenVPN to not start when using valid SSL certificates.

It was also found that openssl-vulnkey from openssl-blacklist would
fail when stderr was not available. This caused OpenVPN to fail to
start when used with applications such as NetworkManager.

This update fixes these problems. We apologize for the inconvenience.

A weakness has been discovered in the random number generator used by
OpenSSL on Debian and Ubuntu systems. As a result of this weakness,
certain encryption keys are much more common than they should be, such
that an attacker could guess the key through a brute-force attack
given minimal knowledge of the system. This particularly affects the
use of encryption keys in OpenSSH, OpenVPN and SSL certificates.

Solution :

Update the affected openssl-blacklist and / or openvpn packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 6.2
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 32360 ()

Bugtraq ID: 29179

CVE ID: