SINIT misconfiguration allows for Privilege Escalation

Intel ID:  INTEL-SA-00021
Product family:  Intel® Trusted Execution Technology
Impact of vulnerability Elevation of Privilege
Severity rating Critical
Original release:  Dec 21, 2009
Last revised:  Dec 21, 2009
Summary: 

An updated SINIT Authenticated Code Module (ACM) is available for affected Intel products to correct a misconfiguration that allows for the circumvention of Intel® Trusted Execution Technology.

Description: 

A misconfiguration in SINIT code could potentially allow a malicious attacker to circumvent Intel® Trusted Execution Technology and elevate their privileges. Intel has released an updated SINIT Authenticated Code Module (ACM) to correct this misconfiguration.

Affected products: 

Systems with Q35, GM45, PM45 Express, Q45, and Q43 Express chipsets.

Recommendations: 

While Intel is not aware of any use of the vulnerabilities described in this advisory, Intel has made an updated SINIT Authenticated Code Module (ACM) available to mitigate this issue. It is highly recommended to apply this updated Authenticated Code Module (ACM).
 
If you are using a Trusted Execution Technology enabled SW (MLE) that uses SINIT modules: Q35_SINIT_XX.BIN, GM45_GS45_PM45_SINIT_XX.BIN, or Q45_Q43_SINIT_XX.BIN, you are affected Intel has made updated SINIT modules available to mitigate this issue. Please contact your MLE vendor or evaluate your measured launch process to determine if an update is required. Updated SINIT Modules can be obtained from http://sourceforge.net/projects/tboot/files/. The table below shows the SINIT Modules by platform. Refer to the Measured Launched Environment Developers Guide if you have additional questions on SINIT. You can download the Measured Launched Environment Developers Guide at http://download.intel.com/technology/security/downloads/315168.pdf.
 

SINIT ACM
Kit#/Name
Platform
Q35_SINIT_18.BIN
Q35-SINIT.tar.gz
Q35
GM45_GS45_PM45_SINIT_21.BIN
GM45_GS45_PM45-SINIT.tar.gz
GM45, GS45, PM45 Express
Q45_Q43_SINIT_18.BIN
Q45_Q43-SINIT.tar.gz
Q45 and Q43 Express

Acknowledgements: 

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

Revision history: 

Revision
Date
Description
1.0
21-December-2009
Initial Release


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