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Ubuntu: USN-1113-1 Critical: Postfix Confidentiality Exposure

An attacker could send crafted input to Postfix and cause it to reveal confidential information.. =========================================================================Ubuntu Security Notice USN-1113-1 April 18, 2011 postfix vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 10.10 - Ubuntu 10.04 LTS - Ubuntu 9.10 - Ubuntu 8.04 LTS - Ubuntu 6.06 LTS Summary: An attacker could send crafted input to Postfix and cause it to reveal confidential information. Software Description: - postfix: High-performance mail transport agent Details: It was discovered that the Postfix package incorrectly granted write access on the PID directory to the postfix user. A local attacker could use this flaw to possibly conduct a symlink attack and overwrite arbitrary files. This issue only affected Ubuntu 6.06 LTS and 8.04 LTS. (CVE-2009-2939) Wietse Venema discovered that Postfix incorrectly handled cleartext commands after TLS is in place. A remote attacker could exploit this to inject cleartext commands into TLS sessions, and possibly obtain confidential information such as passwords. (CVE-2011-0411) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 10.10: postfix 2.7.1-1ubuntu0.1 Ubuntu 10.04 LTS: postfix 2.7.0-1ubuntu0.1 Ubuntu 9.10: postfix 2.6.5-3ubuntu0.1 Ubuntu 8.04 LTS: postfix 2.5.1-2ubuntu1.3 Ubuntu 6.06 LTS: postfix 2.2.10-1ubuntu0.3 In general, a standard system update will make all the necessary changes. References: CVE-2009-2939, CVE-2011-0411 Package Information: https://launchpad.net/ubuntu/+source/postfix/2.7.1-1ubuntu0.1 https://launchpad.net/ubuntu/+source/postfix/2.7.0-1ubuntu0.1 https://launchpad.net/ubuntu/+source/postfix/2.6.5-3ubuntu0.1 https://launchpad.net/ubuntu/+source/postfix/2.5.1-2ubuntu1.3 https://launchpad.net/ubuntu/+source/postfix/2.2.10-1ubuntu0.3 . Safeguard privacy risks in Postfix by applying these critical patches detailed in the Ubuntu Security Advisory USN-1114-1.. Postfix Security, Ubuntu Updates, Remote Attack Protection. . Severity: Critical. LinuxSecurity.com Team

Apr 18, 2011 •Critical Ubuntu