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[USN-1743-1] Linux kernel (Quantal HWE) vulnerability

Posted on 22 February 2013
Ubuntu Security

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Ubuntu Security Notice USN-1743-1
February 22, 2013

linux-lts-quantal vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

The system could be made to run programs as an administrator.

Software Description:
- linux-lts-quantal: Linux hardware enablement kernel from Quantal

Details:

Suleiman Souhlal, Salman Qazi, Aaron Durbin and Michael Davidson discover=
ed
a race condition in the Linux kernel's ptrace syscall. An unprivileged
local attacker could exploit this flaw to run programs as an administrato=
r.

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.5.0-25-generic 3.5.0-25.38~precise1

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 automaticall=
y
perform this as well.

References:
http://www.ubuntu.com/usn/usn-1743-1
CVE-2013-0871

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-quantal/3.5.0-25.38~prec=
ise1


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