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Ubuntu 12.04 LTS: USN-2317-1 Critical: Kernel User Namespace Flaws

Several security issues were fixed in the kernel.. =========================================================================Ubuntu Security Notice USN-2317-1 August 18, 2014 linux-lts-trusty vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 LTS Summary: Several security issues were fixed in the kernel. Software Description: - linux-lts-trusty: Linux hardware enablement kernel from Trusty 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 12.04 LTS: linux-image-3.13.0-34-generic 3.13.0-34.60~precise1 linux-image-3.13.0-34-generic-lpae 3.13.0-34.60~precise1 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 kernel metapackages (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-2317-1 CVE-2014-5206, CVE-2014-5207 PackageInformation: https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-34.60~precise1 . The Ubuntu Security Notice USN-2317-1 addresses Linux kernel vulnerabilities with crucial updates to mitigate security risks and protect system integrity. Ubuntu Kernel Updates, Trusty HWE Issues, Kernel Security Fixes. . Severity: Critical. LinuxSecurity.com Team

Aug 18, 2014 •Critical Ubuntu