Intel® Desktop Boards Privilege Escalation

Intel ID:  INTEL-SA-00022
Product family:  Intel® Desktop
Impact of vulnerability Elevation of Privilege
Severity rating Important
Original release:  Feb 01, 2010
Last revised:  Feb 16, 2010
Summary: 

Software running administrative (ring 0) privilege can under certain circumstances change code running in System Management Mode.

Description: 

A new BIOS update is available for selected Intel desktop motherboards to ensure proper configuration settings. These changes would prevent a malicious user from modifying software that is run in System Management Mode (SMM). SMM is a privileged operating environment running outside of OS control. Malicious software running in this environment could therefore perform any number of operations. Administrative level privileges are required to exploit this issue.

Affected products: 

DQ43AP, DQ45CB, DQ45EK, DQ35JO, DQ35MP, DP45SG, DG43NB, DP43TF, DP55KG, DP55SB, DP55WG, DP55WB, DQ57TM, DH55TC, DH55HC, DG41KR, DB43LD, DG41MJ, DG41RQ, DG41TY, DG43GT

Recommendations: 

While Intel is not aware of any use of the vulnerabilities described in this advisory, Intel has made changes to the BIOS of Intel® Desktop Boards to mitigate this issue. It is highly recommended to apply these updates to affected motherboards.
 
To determine if you need this BIOS update check the BIOS version string. If the number is older than listed in the chart for your motherboard below you need to apply the update.
 
1) During boot, enter the BIOS setup by pressing F2.
2) Check the Main menu.
3) The 4-digit number after the '86A' or '86I' is the current BIOS version, as in this example: MQ96510H.86A.1663.2007.0319.1957
4) Press Escape to exit BIOS Setup
 
For the Intel products listed in the Affected Products table, Intel has made available updated BIOS per the table below. The updated BIOS is available at http://www.intel.com/p/en_US/support. On the 'Advanced Search' line, enter the affected product name (for example DG33BU) and click Search Support. Click on the found product, make sure you're under the support tab and select BIOS updates. Next click on the BIOS title, then follow the instructions on the download page for downloading and installing the BIOS update. Several options are available. For detailed instructions on updating your BIOS refer to http://www.intel.com/support/motherboards/desktop/sb/CS-022312.htm.
   
Desktop Board
Fix included in this version or higher
DQ43AP
APQ4310H.86A.0031
DQ45CB
CBQ4510H.86A.0109
DQ45EK
CBQ4510H.86A.0109
DQ35JO
JOQ3510J.86A.1126
DQ35MP
JOQ3510J.86A.1126
DP55KG
KGIBX10J.86A.4236
DP55SB
KGIBX10J.86A.4236
DP55WG
KGIBX10J.86A.4236
DP55WB
WBIBX10J.86A.0181
DQ57TM
TMIBX10H.86A.0025
DH55TC
TCIBX10H.86A.0028
DH55HC
TCIBX10H.86A.0028
DG41KR
KRG4110H.86A.0029
DB43LD
LDB4310H.86A.0035
DG41MJ
MJG4110H.86A.0006
DG41RQ
RQG4110H.86A.0013
DG41TY
TYG4110H.86A.0037
DP45SG
SGP4510H.86A.0125
DG43NB
NBG4310H.86A.0104
DP43TF
NBG4310H.86A.0104
DG43GT
GTG4310H.86A.0028

Revision history: 

Revision
Date
Description
1.0
01-February-2010
Initial Release
1.1
16-February-2010
Updated with additional boards


Disclaimer:

INFORMATION IN THIS DOCUMENT IS PROVIDED “AS IS” IN CONNECTION WITH INTEL® PRODUCTS. YOUR USE OF THE INFORMATION IN THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. INTEL RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. EXCEPT AS PROVIDED IN INTEL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT.



Reporting a security issue

If you have information about a security issue or vulnerability with an Intel product, please send an e-mail to secure@intel.com. Encrypt sensitive information using our PGP public key.

For issues related to Intel managed open source projects, please visit http://www.01.org/security.

Please provide as much information as possible, including:

  • The products and versions affected
  • Detailed description of the vulnerability
  • Information on known exploits

  • A member of the Intel Product Security Team will review your e-mail and contact you to collaborate on resolving the issue. For more information on how Intel works to resolve security issues, see:

  • Vulnerability handling guidelines

  • Need product support?
    The secure@intel.com e-mail address should only be used for reporting security issues.

    If you...
  • Have questions about the security features of an Intel product
  • Require technical support
  • Want product updates or patches

  • Please visit Support & Downloads.