New BIOS available for Intel® Desktop Board products BIOS to prevent unauthorized downgrading to a previous BIOS version.

Intel ID:  INTEL-SA-00019
Product family:  Intel® Desktop Boards
Impact of vulnerability Elevation of Privilege
Severity rating Important
Original release:  Oct 16, 2009
Last revised:  Oct 16, 2009
Summary: 

New BIOS is available for Intel® Desktop Board products BIOS to prevent downgrading to a previous BIOS version without supervisor/admin permission.

Description: 

To prevent an unauthorized user from flashing Intel® Desktop Board products to a previous BIOS version without an explicit confirmation from the supervisor/user, new BIOS versions are available. Older BIOS versions may be less secure than latest versions.

Affected products: 

Intel® Desktop Board products:             

 
D5400XS, DX58SO, DX48BT2, DX38BT, DP45SG, DQ45CB, DQ45EK, DQ43AP, DB43LD, DG41MJ, DG41RQ, DG41TY, DG45ID, DG45FC, DG43NB, DP43TF, DQ35EC, DQ35JO, DQ35MP, DG35EC, DG33BU, DG33FB, DG33TL, DG31GL, DG31PR, DP35DP, D945GSEJT, D945GCLF, D945GCLF2

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 these issues. A password is now required in order to downgrade to a previous BIOS version providing a user/supervisor password is set. 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
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
DQ35EC
ECG3510M.86A.0117.2009.0625.1315
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

Acknowledgements: 

Intel would like to thank Alexander Tereshkin, Rafal Wojtczuk, and Joanna Rutkowska from Invisible Things Lab, http://invisiblethingslab.com, for working with us.

Revision history: 

Revision
Date
Description
1.0
16-October-2009
Initial release.


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