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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 Vulnurability: Denial of Service
Severity rating: Moderate
Original release:  Jul 03, 2012
Last revised:  Jul 03, 2012


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.


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:


Product name

Latest BMC firmware version


Intel® Server board S2600CP family

Intel® Server system P4000CP family


Intel® Server board S2600JF family

Intel® Server system H2000JF family


Intel® Server board S2600GZ/GL

Intel® Server system R1000GZ/GL product family

Intel® Server system R2000GZ/GL product family


Intel® Workstation board W2600CR family

Intel® Server board S2600IP family

Intel® Workstation system P4000CR family

Intel® Server system P4000IP family


Intel® Server board S2600CO family


Intel® Server board S2600WP family

Intel® Server system H2000WP family


Intel® Server board S2400SC

Intel® Server system P4000SC family


Intel® Server board S2400LP family

Intel® Server System H2000LP family


Intel® Server board S2400GP family

Intel® Server system P4000GP family



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)


Intel® Server board S1200BTL

Intel® Server system R1304BTLSHBN/R1304BTLSFAN/


BMC 1.14.3503


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


Intel® Server board S5500WB

Intel® Server System SR1690WB

Intel® Server System SR1695WB


Intel® Server board S5500BC

Intel® Server System SR1630BC

Intel® Server System SC5650BCDP


Intel® Server board S5520HC/HCT

Intel® Server board S5500HCV

Intel® Server System SC5650HCBRP


Intel® Workstation board S5520SC

Intel® Workstation system SC5650SCWS



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


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:






Initial publication

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