USN-612-11: openssl-blacklist update

18 June 2008

openssl-blacklist update

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

  • Ubuntu 8.04 LTS
  • Ubuntu 7.10
  • Ubuntu 7.04
  • Ubuntu 6.06 LTS

Software Description

  • openssl-blacklist


USN-612-3 addressed a weakness in OpenSSL certificate and key generation and introduced openssl-blacklist to aid in detecting vulnerable certificates and keys. This update adds RSA-4096 blacklists to the openssl-blacklist-extra package and adjusts openssl-vulnkey to properly handle RSA-4096 and higher moduli.

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
openssl-blacklist - 0.3.3+0.4-0ubuntu0.8.04.3
openssl-blacklist-extra - 0.3.3+0.4-0ubuntu0.8.04.3
Ubuntu 7.10
openssl-blacklist - 0.3.3+0.4-0ubuntu0.7.10.2
openssl-blacklist-extra - 0.3.3+0.4-0ubuntu0.7.10.2
Ubuntu 7.04
openssl-blacklist - 0.3.3+0.4-0ubuntu0.7.04.2
openssl-blacklist-extra - 0.3.3+0.4-0ubuntu0.7.04.2
Ubuntu 6.06 LTS
openssl-blacklist - 0.3.3+0.4-0ubuntu0.6.06.2
openssl-blacklist-extra - 0.3.3+0.4-0ubuntu0.6.06.2

To update your system, please follow these instructions:

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