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Ubuntu 14.04 LTS USN-2318-1 Critical: Kernel Escalation Risks

Several security issues were fixed in the kernel.. =========================================================================Ubuntu Security Notice USN-2318-1 August 18, 2014 linux vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 14.04 LTS Summary: Several security issues were fixed in the kernel. Software Description: - linux: Linux kernel Details: Eric W. Biederman discovered a flaw with the mediation of mount flags in the Linux kernel's user namespace subsystem. An unprivileged user could exploit this flaw to by-pass mount restrictions, and potentially gain administrative privileges. (CVE-2014-5207) Kenton Varda discovered a flaw with read-only bind mounds when used with user namespaces. An unprivileged local user could exploit this flaw to gain full write privileges to a mount that should be read only. (CVE-2014-5206) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 LTS: linux-image-3.13.0-34-generic 3.13.0-34.60 linux-image-3.13.0-34-generic-lpae 3.13.0-34.60 linux-image-3.13.0-34-lowlatency 3.13.0-34.60 linux-image-3.13.0-34-powerpc-e500 3.13.0-34.60 linux-image-3.13.0-34-powerpc-e500mc 3.13.0-34.60 linux-image-3.13.0-34-powerpc-smp 3.13.0-34.60 linux-image-3.13.0-34-powerpc64-emb 3.13.0-34.60 linux-image-3.13.0-34-powerpc64-smp 3.13.0-34.60 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernelmetapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://ubuntu.com/security/notices/USN-2318-1 CVE-2014-5206, CVE-2014-5207 Package Information: https://launchpad.net/ubuntu/+source/linux/3.13.0-34.60 . Fixing kernel vulnerabilities in Ubuntu has resolved various problems to ensure the robustness of the system. Significant patches to implement.. Kernel Security Flaws, Ubuntu Update, Auth Privilege Escalation. . Severity: Critical. LinuxSecurity.com Team

Aug 18, 2014 •Critical Ubuntu