USN-1775-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1775-1

22nd March, 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 version:

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

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.

References

CVE-2013-0268, CVE-2013-0309, CVE-2013-1773