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Ubuntu Security Notice USN-1533-1

Ubuntu Security Notice USN-1533-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1533-1 - An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. Ulrich Obergfell discovered an error in the Linux kernel's memory management subsystem on 32 bit PAE systems with more than 4GB of memory installed. A local unprivileged user could exploit this flaw to crash the system. Various other issues were also addressed.

tags | advisory, kernel, local, root
systems | linux, ubuntu
advisories | CVE-2012-2136, CVE-2012-2373, CVE-2012-3375, CVE-2012-3400, CVE-2012-2136, CVE-2012-2373, CVE-2012-3375, CVE-2012-3400
MD5 | 02e3ab665f99c2becbff7af3f76da4d5

Ubuntu Security Notice USN-1533-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-1533-1
August 10, 2012

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

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

- Ubuntu 11.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

An error was discovered in the Linux kernel's network TUN/TAP device
implementation. A local user with access to the TUN/TAP interface (which is
not available to unprivileged users until granted by a root user) could
exploit this flaw to crash the system or potential gain administrative
privileges. (CVE-2012-2136)

Ulrich Obergfell discovered an error in the Linux kernel's memory
management subsystem on 32 bit PAE systems with more than 4GB of memory
installed. A local unprivileged user could exploit this flaw to crash the
system. (CVE-2012-2373)

A flaw was discovered in the Linux kernel's epoll system call. An
unprivileged local user could use this flaw to crash the system.
(CVE-2012-3375)

Some errors where discovered in the Linux kernel's UDF file system, which
is used to mount some CD-ROMs and DVDs. An unprivileged local user could
use these flaws to crash the system. (CVE-2012-3400)

Update instructions:

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

Ubuntu 11.10:
linux-image-3.0.0-24-generic 3.0.0-24.40
linux-image-3.0.0-24-generic-pae 3.0.0-24.40
linux-image-3.0.0-24-omap 3.0.0-24.40
linux-image-3.0.0-24-powerpc 3.0.0-24.40
linux-image-3.0.0-24-powerpc-smp 3.0.0-24.40
linux-image-3.0.0-24-powerpc64-smp 3.0.0-24.40
linux-image-3.0.0-24-server 3.0.0-24.40
linux-image-3.0.0-24-virtual 3.0.0-24.40

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-1533-1
CVE-2012-2136, CVE-2012-2373, CVE-2012-3375, CVE-2012-3400

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.0.0-24.40

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