Ubuntu: 1775-1: Linux kernel vulnerabilities
Posted by Benjamin D. Thomas   
Ubuntu Several security issues were fixed in the kernel.
==========================================================================
Ubuntu Security Notice USN-1775-1
March 22, 2013

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

A flaw was reported in the permission checks done by the Linux kernel for
/dev/cpu/*/msr. A local root user with all capabilities dropped could
exploit this flaw to execute code with full root capabilities.
(CVE-2013-0268)

A flaw was discovered in the Linux kernels handling of memory ranges with
PROT_NONE when transparent hugepages are in use. An unprivileged local user
could exploit this flaw to cause a denial of service (crash the system).
(CVE-2013-0309)

A flaw was discovered on the Linux kernel's VFAT filesystem driver when a
disk is mounted with the utf8 option (this is the default on Ubuntu). On a
system where disks/images can be auto-mounted or a FAT filesystem is
mounted an unprivileged user can exploit the flaw to gain root privileges.
(CVE-2013-1773)

Update instructions:

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

Ubuntu 10.04 LTS:
  linux-image-2.6.32-46-386       2.6.32-46.105
  linux-image-2.6.32-46-generic   2.6.32-46.105
  linux-image-2.6.32-46-generic-pae  2.6.32-46.105
  linux-image-2.6.32-46-ia64      2.6.32-46.105
  linux-image-2.6.32-46-lpia      2.6.32-46.105
  linux-image-2.6.32-46-powerpc   2.6.32-46.105
  linux-image-2.6.32-46-powerpc-smp  2.6.32-46.105
  linux-image-2.6.32-46-powerpc64-smp  2.6.32-46.105
  linux-image-2.6.32-46-preempt   2.6.32-46.105
  linux-image-2.6.32-46-server    2.6.32-46.105
  linux-image-2.6.32-46-sparc64   2.6.32-46.105
  linux-image-2.6.32-46-sparc64-smp  2.6.32-46.105
  linux-image-2.6.32-46-versatile  2.6.32-46.105
  linux-image-2.6.32-46-virtual   2.6.32-46.105

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:
  http://www.ubuntu.com/usn/usn-1775-1
  CVE-2013-0268, CVE-2013-0309, CVE-2013-1773

Package Information:
  https://launchpad.net/ubuntu/+source/linux/2.6.32-46.105