USN-612-10: OpenVPN regression

12 June 2008

openvpn regression

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 8.04 LTS
  • Ubuntu 7.10
  • Ubuntu 7.04

Software Description

  • openvpn

Details

USN-612-3 addressed a weakness in OpenSSL certificate and key generation in OpenVPN by adding checks for vulnerable certificates and keys to OpenVPN. A regression was introduced in OpenVPN when using TLS with password protected certificates which caused OpenVPN to not start when used with applications such as NetworkManager.

Original advisory details: 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.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 8.04 LTS
openvpn - 2.1~rc7-1ubuntu3.3
Ubuntu 7.10
openvpn - 2.0.9-8ubuntu0.3
Ubuntu 7.04
openvpn - 2.0.9-5ubuntu0.3

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system upgrade is sufficient to effect the necessary changes.

References