Test ID:	1.3.6.1.4.1.25623.1.0.840281
Category:	Ubuntu Local Security Checks
Title:	Ubuntu: Security Advisory (USN-612-8)
Summary:	The remote host is missing an update for the 'openssl-blacklist' package(s) announced via the USN-612-8 advisory.
Description:	Summary: The remote host is missing an update for the 'openssl-blacklist' package(s) announced via the USN-612-8 advisory. Vulnerability Insight: 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 blocklists for all Ubuntu architectures, as well as support for other future blocklists 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. Affected Software/OS: 'openssl-blacklist' package(s) on Ubuntu 6.06, Ubuntu 7.04, Ubuntu 7.10, Ubuntu 8.04. Solution: Please install the updated package(s). CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Copyright	Copyright (C) 2009 Greenbone AG

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