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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
Linux Kernel EFI GUID Partition Table Buffer Overflow Lets Local Users Deny Service
SecurityTracker Alert ID:  1025355
SecurityTracker URL:  http://securitytracker.com/id/1025355
CVE Reference:   CVE-2011-1577   (Links to External Site)
Date:  Apr 14 2011
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.4.x, 2.6.x
Description:   A vulnerability was reported in Linux Kernel. A local user can cause denial of service conditions.

A local user can create a device with a specially crafted EFI GUID partition table to trigger a buffer overflow and cause a kernel oops when the device is connected to the target system.

The vulnerability resides in 'fs/partitions/efi.c'.

Timo Warns (PRESENSE Technologies GmbH) reported this vulnerability.

Impact:   A local user can cause the target system to crash.
Solution:   The vendor has issued a source code fix.
Vendor URL:  www.kernel.org/ (Links to External Site)
Cause:   Boundary error

Message History:   None.


 Source Message Contents

Subject:  [PRE-SA-2011-03] Denial-of-service vulnerability in EFI partition handling code of the Linux kernel

PRE-CERT Security Advisory
==========================

* Advisory: PRE-SA-2011-03
* Released on: 13 Apr 2011
* Last updated on: 13 Apr 2011
* Affected product: Linux Kernel 2.4 and 2.6
* Impact: denial-of-service
* Origin: storage devices
* Credit: Timo Warns (PRESENSE Technologies GmbH)
* CVE Identifier: CVE-2011-1577


Summary
-------

The Linux kernel contains a vulnerability that may lead to
a denial-of-service due to corrupted partition tables on storage
devices.

The kernel automatically evaluates partition tables of storage devices.
This happens independently of whether any auto-mounting is enabled or
not. The code for evaluating EFI GUID partition tables contains a buffer
overflow bug that allows to cause kernel oops resulting in a denial of
service.


Workaround
----------

Compile and use a kernel that does not evaluate EFI GUID partition
tables. The corresponding configuration key is CONFIG_EFI_PARTITION.


Solution
--------

A patch is available at
http://www.spinics.net/lists/mm-commits/msg83274.html


References
----------

When further information becomes available, this advisory will be
updated. The most recent version of this advisory is available at:

http://www.pre-cert.de/advisories/PRE-SA-2011-03.txt


Contact
-------

PRE-CERT can be reached under precert@pre-secure.de. For PGP key
information, refer to http://www.pre-cert.de/.
 
 


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