=========================================================== Ubuntu Security Notice USN-612-8 May 21, 2008 openssl-blacklist update http://www.ubuntu.com/usn/usn-612-1 http://www.ubuntu.com/usn/usn-612-3 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 7.04 Ubuntu 7.10 Ubuntu 8.04 LTS This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 6.06 LTS: openssl-blacklist 0.1-0ubuntu0.6.06.1 Ubuntu 7.04: openssl-blacklist 0.1-0ubuntu0.7.04.4 Ubuntu 7.10: openssl-blacklist 0.1-0ubuntu0.7.10.4 Ubuntu 8.04 LTS: openssl-blacklist 0.1-0ubuntu0.8.04.4 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: USN-612-3 addressed a weakness in OpenSSL certificate and key generation in OpenVPN by introducing openssl-blacklist to aid in detecting vulnerable private keys. This update enhances the openssl-vulnkey tool to check X.509 certificates as well, and provides the corresponding update for Ubuntu 6.06. While the OpenSSL in Ubuntu 6.06 was not vulnerable, openssl-blacklist is now provided for Ubuntu 6.06 for checking certificates and keys that may have been imported on these systems. This update also includes the complete RSA-1024 and RSA-2048 blacklists for all Ubuntu architectures, as well as support for other future blacklists for non-standard bit lengths. You can check for weak SSL/TLS certificates by installing openssl-blacklist via your package manager, and using the openssl-vulnkey command. $ openssl-vulnkey /path/to/certificate_or_key This command can be used on public certificates and private keys for any X.509 certificate or RSA key, including ones for web servers, mail servers, OpenVPN, and others. If in doubt, destroy the certificate and key and generate new ones. Please consult the documentation for your software when recreating SSL/TLS certificates. Also, if certificates have been generated for use on other systems, they must be found and replaced as well. 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. Updated packages for Ubuntu 6.06 LTS: Source archives: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.6.06.1.dsc Size/MD5: 548 b437e5037437d46ba896cf28be43fa55 http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.6.06.1.tar.gz Size/MD5: 8998682 154e882671f25f5ef5a100ef2709cd4e Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.6.06.1_all.deb Size/MD5: 4235438 b78f5861f72699f7699e3f60d7e7d235 Updated packages for Ubuntu 7.04: Source archives: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.04.4.dsc Size/MD5: 600 8045fc0b37070b448b00123c395af0fd http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.04.4.tar.gz Size/MD5: 8999060 4a23e360873f70d978401837a5a1a462 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.04.4_all.deb Size/MD5: 4236958 7ec420cb408154facae641776ac1aeaf Updated packages for Ubuntu 7.10: Source archives: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.10.4.dsc Size/MD5: 600 e484758b7e017b511fc34eff1878a2eb http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.10.4.tar.gz Size/MD5: 8999062 1f59fe1ae585543431a58f050cb8fe46 Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.7.10.4_all.deb Size/MD5: 4237110 8451e9872b23fc0f73ef16f384d4dddb Updated packages for Ubuntu 8.04 LTS: Source archives: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.8.04.4.dsc Size/MD5: 600 78f29ecb3d69baf5f529f15a06c41cf4 http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.8.04.4.tar.gz Size/MD5: 8999068 d67755ccd109508c460a4a3a830d699d Architecture independent packages: http://security.ubuntu.com/ubuntu/pool/main/o/openssl-blacklist/openssl-blacklist_0.1-0ubuntu0.8.04.4_all.deb Size/MD5: 4236630 36f5d84a1cff08e86a6b1646565245e6
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