Low Entropy RSA Issue in Intel EPSD Baseboard Management Controller (BMC) Firmware

Intel ID:  INTEL-SA-00031
Product family:  Intel Server Board S1200, S2600, S3420, S5500, S5600 Family
Impact of vulnerability Denial of Service
Severity rating Moderate
Original release:  Jul 03, 2012
Last revised:  Jul 03, 2012
Summary: 

There is a potential security vulnerability related to the improper generation of RSA encryption keys in EPSD Baseboard Management Controller (BMC) firmware. Intel is releasing updated versions of the BMC firmware to mitigate the potential vulnerability.

Description: 

There is a potential security vulnerability related to the improper generation of RSA encryption keys in EPSD Baseboard Management Controller (BMC) firmware. This potential vulnerability entails an attacker who might intercept on-going communication between the BMC web-server and user (active man-in-the-middle), and cause a temporary denial of service, after obtaining the private key. Intel is releasing updated versions of the BMC FW to mitigate the potential vulnerability. In brief, the technical improvements include modifying the random number generation mechanism to avoid factorable RSA public keys. As of the date of this advisory, Intel is not aware of any active exploits of this potential vulnerability.

Affected products: 

Generation
Product name
Latest BMC firmware version
Romley
Intel® Server board S2600CP family
Intel® Server system P4000CP family
1.10
Intel® Server board S2600JF family
Intel® Server system H2000JF family
1.10
Intel® Server board S2600GZ/GL
Intel® Server system R1000GZ/GL product family
Intel® Server system R2000GZ/GL product family
1.10
Intel® Workstation board W2600CR family
Intel® Server board S2600IP family
Intel® Workstation system P4000CR family
Intel® Server system P4000IP family
1.10
Intel® Server board S2600CO family
1.10
Intel® Server board S2600WP family
Intel® Server system H2000WP family
1.10
Intel® Server board S2400SC
Intel® Server system P4000SC family
1.10
Intel® Server board S2400LP family
Intel® Server System H2000LP family
1.10
Intel® Server board S2400GP family
Intel® Server system P4000GP family
1.10
Foxhollow
Intel® Server board S3420GPLC/LX/RX
Intel® Server system SR1630GP/HGP
Intel® Server system SR1695GPRX
Intel® Server system SR1630GPRX/HGPRX
GP_0125 (LC/LX SKUs)
GPRX_0125 (RX SKUs)
Bromolow
Intel® Server board S1200BTL
Intel® Server system R1304BTLSHBN/R1304BTLSFAN/
P4304BTLSHCN/P4304BTLSFCN
BMC 1.14.3503
Thurley
Intel® Server board S5520UR/URT
Intel® Server System SR1600UR/URHS
Intel® Server System SR1625UR/URSAS
Intel® Server System SR2600URBRP/URLX/URSATA
Intel® Server System SR2625URBRP/URLX/URLXT
BMC00.60
Intel® Server board S5500WB
Intel® Server System SR1690WB
Intel® Server System SR1695WB
BMC00.60
Intel® Server board S5500BC
Intel® Server System SR1630BC
Intel® Server System SC5650BCDP
BMC00.60
Intel® Server board S5520HC/HCT
Intel® Server board S5500HCV
Intel® Server System SC5650HCBRP
BMC00.60
Intel® Workstation board S5520SC
Intel® Workstation system SC5650SCWS
BMC00.60

Recommendations: 

Intel highly recommends affected customers to update the BMC firmware to the latest version to mitigate this potential vulnerability. The latest BMC firmware version for your specific product is mentioned in the above list and is available at downloadcenter.intel.com.

Acknowledgements: 

Intel would like to thank Nadia Heninger from UCSD, and Zakir Durumeric, Eric Wustrow, and J. Alex Halderman from the University of Michigan for reporting this issue and working with us.

Revision history: 

Revision
Date
Description
1.0
03-July-2012
Initial publication


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