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[USN-1301-1] Linux kernel (Natty backport) vulnerabilities

Posted on 13 December 2011
Ubuntu Security

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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 loc=
al
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 =
=20
been given a new version number, which requires you to recompile and =
=20
reinstall all third party kernel modules you might have installed. If =
=20
you use linux-restricted-modules, you have to update that package as =
=20
well to get modules which work with the new kernel version. Unless you =
=20
manually uninstalled the standard kernel metapackages (e.g. linux-generic=
, =20
linux-server, linux-powerpc), a standard system upgrade will automaticall=
y =20
perform this as well. =
=20

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=
=2E53~lucid1



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