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View Full Version : USN-612-3: OpenVPN vulnerability



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May 13th, 2008, 09:20 PM
Referenced CVEs:
CVE-2008-0166


Description:
================================================== ========= Ubuntu Security Notice USN-612-3 May 13, 2008 openvpn vulnerability CVE-2008-0166, http://www.ubuntu.com/usn/usn-612-1 ================================================== ========= 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 shared encryption keys and SSL/TLS certificates in OpenVPN. This vulnerability only affects operating systems which (like Ubuntu) are based on Debian. However, other systems can be indirectly affected if weak keys are imported into them. We consider this an extremely serious vulnerability, and urge all users to act immediately to secure their systems. The following Ubuntu releases are affected: 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 7.04: openvpn 2.0.9-5ubuntu0.1 Ubuntu 7.10: openvpn 2.0.9-8ubuntu0.1 Ubuntu 8.04 LTS: openvpn 2.1~rc7-1ubuntu3.1 Details follow: Once the update is applied, weak shared encryption keys and SSL/TLS certificates will be rejected where possible (though they cannot be detected in all cases). If you are using such keys or certificates, OpenVPN will not start and the keys or certificates will need to be regenerated. The safest course of action is to regenerate all OpenVPN certificates and key files, except where it can be established to a high degree of certainty that the certificate or shared key was generated on an unaffected system. Once the update is applied, you can check for weak OpenVPN shared secret keys with the openvpn-vulnkey command. $ openvpn-vulnkey /path/to/key OpenVPN shared keys can be regenerated using the openvpn command. $ openvpn --genkey --secret Additionally, 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/key Please note that openssl-vulnkey only checks RSA private keys with 1024 and 2048 bit lengths. If in doubt, destroy the certificate and/or key and generate a new one. Please consult the OpenVPN documentation when recreating SSL/TLS certificates. Also, if certificates have been generated for use on other systems, they must be found and replaced as well. Updated packages for Ubuntu 7.04: Source archives: http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1.diff.gz Size/MD5: 60747 8a64cba41a38497fe25ef36afa3297a4 http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1.dsc Size/MD5: 641 18586d5869fb67929f2330dba3730498 http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9.orig.tar.gz Size/MD5: 669076 60745008b90b7dbe25fe8337c550fec6 amd64 architecture (Athlon64, Opteron, EM64T Xeon): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1_amd64.deb Size/MD5: 356162 cff07c3dbbc6b56a4932d91b6049499e i386 architecture (x86 compatible Intel/AMD): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1_i386.deb Size/MD5: 337190 2ece431df11236714da50fc28a63f238 powerpc architecture (Apple Macintosh G3/G4/G5): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1_powerpc.deb Size/MD5: 357868 b9877bc7840768f0002a8e8016e8401a sparc architecture (Sun SPARC/UltraSPARC): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-5ubuntu0.1_sparc.deb Size/MD5: 335978 8ff9625fb34f49e64cfb8811bb787b3a Updated packages for Ubuntu 7.10: Source archives: http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1.diff.gz Size/MD5: 64195 02287a5ee333a17db50cb43c9d902433 http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1.dsc Size/MD5: 642 d2a6e3308144f656dbfd35526e944187 http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9.orig.tar.gz Size/MD5: 669076 60745008b90b7dbe25fe8337c550fec6 amd64 architecture (Athlon64, Opteron, EM64T Xeon): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1_amd64.deb Size/MD5: 361852 19adb72a25cb5a4803bbc7e4b787d08f i386 architecture (x86 compatible Intel/AMD): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1_i386.deb Size/MD5: 341626 0fe67ae7eee3fd15900e78243dbec409 lpia architecture (Low Power Intel Architecture): http://ports.ubuntu.com/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1_lpia.deb Size/MD5: 343206 51f7d5738b58ce8315fee4cf9a6855cf powerpc architecture (Apple Macintosh G3/G4/G5): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1_powerpc.deb Size/MD5: 363094 1b3067714e8cc68a494715d39b2f0b63 sparc architecture (Sun SPARC/UltraSPARC): http://security.ubuntu.com/ubuntu/pool/universe/o/openvpn/openvpn_2.0.9-8ubuntu0.1_sparc.deb Size/MD5: 341314 6bf8aa1066a79f4f0a17750fa0376238 Updated packages for Ubuntu 8.04 LTS: Source archives: http://security.ubuntu.com/ubuntu/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1.diff.gz Size/MD5: 35191 c3c32ea1efcc83a0deb61f3adcfc1609 http://security.ubuntu.com/ubuntu/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1.dsc Size/MD5: 646 35a1021ae123a548cd57aeba15385b9e http://security.ubuntu.com/ubuntu/pool/main/o/openvpn/openvpn_2.1~rc7.orig.tar.gz Size/MD5: 786288 dac8b5104b5eb105ba82b2525d371d58 amd64 architecture (Athlon64, Opteron, EM64T Xeon): http://security.ubuntu.com/ubuntu/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1_amd64.deb Size/MD5: 390828 537d1c0fba3fd2ea1853f2cd59df8c39 i386 architecture (x86 compatible Intel/AMD): http://security.ubuntu.com/ubuntu/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1_i386.deb Size/MD5: 372070 402b12a2ba4b1aa706e6160fe4c4c18b lpia architecture (Low Power Intel Architecture): http://ports.ubuntu.com/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1_lpia.deb Size/MD5: 371074 acf51c0ab94e0f8a052d8e16de01c918 powerpc architecture (Apple Macintosh G3/G4/G5): http://ports.ubuntu.com/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1_powerpc.deb Size/MD5: 391320 5315f5eda07a544d11c4ae415414f756 sparc architecture (Sun SPARC/UltraSPARC): http://ports.ubuntu.com/pool/main/o/openvpn/openvpn_2.1~rc7-1ubuntu3.1_sparc.deb Size/MD5: 368786 96633aff8986fe2fedcbed30bb3090dd





More... (http://www.ubuntu.com/usn/usn-612-3)