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
 
 

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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