U radu jezgre operacijskog sustava Ubuntu (linux-lts-backport-natty) uočeno je nekoliko sigurnosnih propusta. Lokalni ih napadač može iskoristiti za dobivanje administratorskih ovlasti i izvođenje napada uskraćivanjem usluge.

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Ubuntu Security Notice USN-1301-1
December 13, 2011

linux-lts-backport-natty vulnerabilities
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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-lts-backport-natty: Linux kernel backport from Natty

Details:

A bug was discovered in the XFS filesystem's handling of pathnames. A local
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this
to cause a kernel oops. (CVE-2011-4081)

A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)

Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)

Update instructions:

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

Ubuntu 10.04 LTS:
  linux-image-2.6.38-13-generic   2.6.38-13.53~lucid1
  linux-image-2.6.38-13-generic-pae  2.6.38-13.53~lucid1
  linux-image-2.6.38-13-server    2.6.38-13.53~lucid1
  linux-image-2.6.38-13-virtual   2.6.38-13.53~lucid1

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-1301-1
  CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4330

Package Information:
 
https://launchpad.net/ubuntu/+source/linux-lts-backport-natty/2.6.38-13.53~lucid1