USN-1796-1: Linux kernel vulnerabilities

08 April 2013

Several security issues were fixed in the kernel.

Releases

Packages

Details

Andrew Jones discovered a flaw with the xen_iret function in Linux kernel's
Xen virtualizeation. In the 32-bit Xen paravirt platform an unprivileged
guest OS user could exploit this flaw to cause a denial of service (crash
the system) or gain guest OS privilege. (CVE-2013-0228)

Emese Revfy discovered that in the Linux kernel signal handlers could leak
address information across an exec, making it possible to by pass ASLR
(Address Space Layout Randomization). A local user could use this flaw to
by pass ASLR to reliably deliver an exploit payload that would otherwise be
stopped (by ASLR). (CVE-2013-0914)

A memory use after free error was discover in the Linux kernel's tmpfs
filesystem. A local user could exploit this flaw to gain privileges or
cause a denial of service (system crash). (CVE-2013-1767)

Mateusz Guzik discovered a race in the Linux kernel's keyring. A local user
could exploit this flaw to cause a denial of service (system crash).
(CVE-2013-1792)

Mathias Krause discovered a memory leak in the Linux kernel's crypto report
API. A local user with CAP_NET_ADMIN could exploit this leak to examine
some of the kernel's stack memory. (CVE-2013-2546)

Mathias Krause discovered a memory leak in the Linux kernel's crypto report
API. A local user with CAP_NET_ADMIN could exploit this leak to examine
some of the kernel's heap memory. (CVE-2013-2547)

Mathias Krause discovered information leaks in the Linux kernel's crypto
algorithm report API. A local user could exploit these flaws to leak kernel
stack and heap memory contents. (CVE-2013-2548)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 12.10

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.

Related notices

  • USN-1787-1: linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-server, linux-image-3.0.0-32-omap, linux-image-3.0.0-32-powerpc, linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-powerpc64-smp, linux, linux-image-3.0.0-32-powerpc-smp, linux-image-3.0.0-32-generic
  • USN-1778-1: linux-image-3.0.0-1222-omap4, linux-ti-omap4
  • USN-1767-1: linux-image-3.2.0-39-omap, linux-image-3.2.0-39-generic, linux-image-3.2.0-39-highbank, linux-image-3.2.0-39-generic-pae, linux-image-3.2.0-39-virtual, linux-image-3.2.0-39-powerpc-smp, linux, linux-image-3.2.0-39-powerpc64-smp
  • USN-1808-1: linux-image-2.6.32-351-ec2, linux-ec2
  • USN-1792-1: linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-386, linux-image-2.6.32-46-server, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-virtual, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-preempt, linux, linux-image-2.6.32-46-powerpc
  • USN-1756-1: linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-server, linux-image-3.0.0-32-omap, linux-image-3.0.0-32-powerpc, linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-powerpc64-smp, linux, linux-image-3.0.0-32-powerpc-smp, linux-image-3.0.0-32-generic
  • USN-1781-1: linux-ti-omap4, linux-image-3.2.0-1427-omap4
  • USN-1795-1: linux-lts-quantal, linux-image-3.5.0-27-generic
  • USN-1794-1: linux-image-3.2.0-1429-omap4, linux-ti-omap4
  • USN-1805-1: linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-386, linux-image-2.6.32-46-server, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-virtual, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-preempt, linux, linux-image-2.6.32-46-powerpc
  • USN-1797-1: linux-image-3.5.0-222-omap4, linux-ti-omap4
  • USN-1793-1: linux-image-3.2.0-40-highbank, linux-image-3.2.0-40-powerpc-smp, linux, linux-image-3.2.0-40-virtual, linux-image-3.2.0-40-powerpc64-smp, linux-image-3.2.0-40-generic-pae, linux-image-3.2.0-40-generic, linux-image-3.2.0-40-omap
  • USN-1788-1: linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-server, linux-lts-backport-oneiric, linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-generic
  • USN-1760-1: linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-server, linux-lts-backport-oneiric, linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-generic
  • USN-1798-1: linux-image-2.6.32-351-ec2, linux-ec2