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Ubuntu 15.10 OpenSSH Advisory USN-2966-1: Serious DoS and Escalation Risks

Several security issues were fixed in OpenSSH.. =========================================================================Ubuntu Security Notice USN-2966-1 May 09, 2016 openssh vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 15.10 - Ubuntu 14.04 LTS - Ubuntu 12.04 LTS Summary: Several security issues were fixed in OpenSSH. Software Description: - openssh: secure shell (SSH) for secure access to remote machines Details: Shayan Sadigh discovered that OpenSSH incorrectly handled environment files when the UseLogin feature is enabled. A local attacker could use this issue to gain privileges. (CVE-2015-8325) Ben Hawkes discovered that OpenSSH incorrectly handled certain network traffic. A remote attacker could possibly use this issue to cause OpenSSH to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. (CVE-2016-1907) Thomas Hoger discovered that OpenSSH incorrectly handled untrusted X11 forwarding when the SECURITY extension is disabled. A connection configured as being untrusted could get switched to trusted in certain scenarios, contrary to expectations. (CVE-2016-1908) It was discovered that OpenSSH incorrectly handled certain X11 forwarding data. A remote authenticated attacker could possibly use this issue to bypass certain intended command restrictions. (CVE-2016-3115) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 15.10: openssh-server 1:6.9p1-2ubuntu0.2 Ubuntu 14.04 LTS: openssh-server 1:6.6p1-2ubuntu2.7 Ubuntu 12.04 LTS: openssh-server 1:5.9p1-5ubuntu1.9 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-2966-1 CVE-2015-8325, CVE-2016-1907, CVE-2016-1908, CVE-2016-3115 PackageInformation: https://launchpad.net/ubuntu/+source/openssh/1:6.9p1-2ubuntu0.2 https://launchpad.net/ubuntu/+source/openssh/1:6.6p1-2ubuntu2.7 https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.9 . Various vulnerabilities in OpenSSH for Ubuntu have been resolved with appropriate patches; make sure your system is protected.. OpenSSH Security Update, Ubuntu OpenSSH Advisory, SSH Privilege Escalation, Denial of Service Ubuntu. . Severity: Critical. LinuxSecurity.com Team

May 09, 2016 •Critical Ubuntu