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Intel® Desktop and Intel® Server Boards Privilege Escalation

Intel ID INTEL-SA-00018
Product family Intel® Desktop and Intel® Server Boards
Impact of vulnerability Elevation of Privilege
Severity rating Important
Original release Jul 28, 2009
Last revised Oct 05, 2009

Summary: 

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

Description: 

To mitigate reported privilege escalation issues, BIOS updates are available for specific Intel motherboards. These changes would help 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 these issues.

Affected products: 

Intel® Desktop Board products: 

D5400XS, DX58SO, DX48BT2, DX38BT, DP45SG, DQ45CB, DQ45EK, DQ43AP, DB43LD, DG41MJ, DG41RQ, DG41TY, DG45ID, DG45FC, DG43NB, DP43TF, DQ35JO, DQ35MP, DG33BU, DG33FB, DG33TL, DG35EC, DP35DP, D945GSEJT, D945GCLF, D945GCLF2 

Intel® Server Boards: 

S3000 series, S3200 series S5000 series, S5400 series, S5500 series, and S7000 series server products. 

Recommendations: 

Recommendations:

 

While Intel is not aware of any use of the vulnerabilities described in this advisory, Intel has made changes to the BIOS firmware of select Intel Motherboards to mitigate these issues. It is highly recommended to apply these updates to affected motherboards. For the Intel products listed in the Affected Products table, Intel has made available updated BIOS firmware per the table below. The updated BIOS firmware is available at http://www.intel.com/products/motherboard/index.htm?iid=prod+prod_board. From this web page select "Downloads" near the top of the page. On the 'Search Downloads' line, enter the product name (for example DG33BU) and click search. Click on the found product, select your operating system and click 'Go'. 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 Intel® Desktop BIOS refer to gttp://www.intel.com/support/motherboards/desktop/sb/CS-022312.htm. For Intel® Server Boards refer to the product release notes for your Intel® motherboard for detailed instructions.

 

How to tell if you need this update:

 

Intel® Desktop Motherboards:

 

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 the BIOS version is 1663.

4) If the version number shown is less than what's listed in the table below you need to apply the latest BIOS.

5) Press Escape to exit BIOS Setup

 

Intel® Server Motherboards:

 

1) During boot, enter the BIOS setup by pressing F2.

2) Check the Main menu.

3) The 4-digit number prior to the date code is the current BIOS version, as in this example: S5500.86B.01.00.0037.05052009 the BIOS version is 0037.

4) If the version number shown is less than what's listed in the table below you need to apply the latest BIOS.

5) Press Escape to exit BIOS Setup

Intel® Desktop Board

Fix included in this version or higher

D5400XS

XS54010J.86A.1338

DX58SO                     

SOX5810J.86A.4196

DX48BT2                   

BTX3810J.86A.2000

DX38BT                     

BTX3810J.86A.2000

DP45SG                      

SGP4510H.86A.0118

DQ45CB                     

CBQ4510H.86A.0087

DQ45EK                     

CBQ4510H.86A.0087

DQ43AP                     

APQ4310H.86A.0025

DB43LD                     

LDB4310H.86A.0031

DG41MJ                     

MJG4110H.86A.0004

DG41RQ                    

RQG4110H.86A.0011

DG41TY                     

TYG4110H.86A.0030

DG45ID                      

IDG4510H.86A.0105

DG45FC                     

IDG4510H.86A.0105

DG43NB                    

NBG4310H.86A.0087

DP43TF                      

NBG4310H.86A.0087

DQ35JO                     

JOQ3510J.86A.1108

DQ35MP                    

JOQ3510J.86A.1108

DG33BU                    

DPP3510J.86A.0572

DG33FB                     

DPP3510J.86A.0572

DG33TL                     

DPP3510J.86A.0572

DP35DP                      

DPP3510J.86A.0572

D945GSEJT                

JT94510H.86A.0032

D945GCLF                 

LF94510J.86A.0183

D945GCLF2               

LF94510J.86A.0183

 

 

Intel® Server  Board

 

S3000 Series

S3000.86B.02.00.0054.06122009

S3200 Series

3200X38.86B.00.00.0049.06162009

S5000 Series

S5000.86B.12.00.0098.06232009

S5400 Series

S5400.86B.06.00.0032.070620091931

S5500 Series

S5500.86B.01.00.0037.05052009

S7000 Series

SFC4UR.86B.01.00.0029

Acknowledgements: 

Intel would like to thank Alexander Tereshkin, Rafal Wojtczuk, and Joanna Rutkowska from Invisible Things Lab, http://invisiblethingslab.com, for working with us.
 
Intel would like to thank Loïc Duflot, French National Information Systems Security Agency (ANSSI), for working with us.

Revision history:

Revision

Date

Description

1.0

28-July-2009

Initial release

1.1

05-August-2009

Corrected formatting

1.2

06-August-2009

Corrected formatting.

1.3

17-August-2009

Added DG35EC and D945GSEJT BIOS.

1.4

05-October-2009

Added S7000 series server products

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