USN-1941-1: Linux kernel vulnerabilities
6 September 2013
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Several security issues were fixed in the kernel.
- linux - Linux kernel
Chanam Park reported a Null pointer flaw in the Linux kernel’s Ceph client. A remote attacker could exploit this flaw to cause a denial of service (system crash). (CVE-2013-1059)
Vasily Kulikov discovered a flaw in the Linux Kernel’s perf tool that allows for privilege escalation. A local user could exploit this flaw to run commands as root when using the perf tool. (CVE-2013-1060)
Jonathan Salwan discovered an information leak in the Linux kernel’s cdrom driver. A local user can exploit this leak to obtain sensitive information from kernel memory if the CD-ROM drive is malfunctioning. (CVE-2013-2164)
A flaw was discovered in the Linux kernel when an IPv6 socket is used to connect to an IPv4 destination. An unprivileged local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-2232)
An information leak was discovered in the IPSec key_socket implementation in the Linux kernel. An local user could exploit this flaw to examine potentially sensitive information in kernel memory. (CVE-2013-2234)
Kees Cook discovered a format string vulnerability in the Linux kernel’s disk block layer. A local user with administrator privileges could exploit this flaw to gain kernel privileges. (CVE-2013-2851)
Hannes Frederic Sowa discovered a flaw in setsockopt UDP_CORK option in the Linux kernel’s IPv6 stack. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4162)
Hannes Frederic Sowa discovered a flaw in the IPv6 subsystem of the Linux kernel when the IPV6_MTU setsockopt option has been specified in combination with the UDP_CORK option. A local user could exploit this flaw to cause a denial of service (system crash). (CVE-2013-4163)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 12.04 LTS
- linux-image-3.2.0-53-generic - 3.2.0-53.81
- linux-image-3.2.0-53-generic-pae - 3.2.0-53.81
- linux-image-3.2.0-53-highbank - 3.2.0-53.81
- linux-image-3.2.0-53-omap - 3.2.0-53.81
- linux-image-3.2.0-53-powerpc-smp - 3.2.0-53.81
- linux-image-3.2.0-53-powerpc64-smp - 3.2.0-53.81
- linux-image-3.2.0-53-virtual - 3.2.0-53.81
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.