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Ubuntu Security Notice USN-2492-1

Ubuntu Security Notice USN-2492-1
Posted Feb 4, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2492-1 - Andy Lutomirski discovered an information leak in the Linux kernel's Thread Local Storage (TLS) implementation allowing users to bypass the espfix to obtain information that could be used to bypass the Address Space Layout Randomization (ASLR) protection mechanism. A local user could exploit this flaw to obtain potentially sensitive information from kernel memory. A flaw was discovered with file renaming in the linux kernel. A local user could exploit this flaw to cause a denial of service (deadlock and system hang). Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2014-8133, CVE-2014-8559, CVE-2014-9420
MD5 | 89caf0566b508d19a1b90d970669d7b7

Ubuntu Security Notice USN-2492-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2492-1
February 04, 2015

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

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

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Andy Lutomirski discovered an information leak in the Linux kernel's Thread
Local Storage (TLS) implementation allowing users to bypass the espfix to
obtain information that could be used to bypass the Address Space Layout
Randomization (ASLR) protection mechanism. A local user could exploit this
flaw to obtain potentially sensitive information from kernel memory.
(CVE-2014-8133)

A flaw was discovered with file renaming in the linux kernel. A local user
could exploit this flaw to cause a denial of service (deadlock and system
hang). (CVE-2014-8559)

Prasad J Pandit reported a flaw in the rock_continue function of the Linux
kernel's ISO 9660 CDROM file system. A local user could exploit this flaw
to cause a denial of service (system crash or hang). (CVE-2014-9420)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-76-generic 3.2.0-76.111
linux-image-3.2.0-76-generic-pae 3.2.0-76.111
linux-image-3.2.0-76-highbank 3.2.0-76.111
linux-image-3.2.0-76-omap 3.2.0-76.111
linux-image-3.2.0-76-powerpc-smp 3.2.0-76.111
linux-image-3.2.0-76-powerpc64-smp 3.2.0-76.111
linux-image-3.2.0-76-virtual 3.2.0-76.111

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-2492-1
CVE-2014-8133, CVE-2014-8559, CVE-2014-9420

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-76.111

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