Vigil@nce - BIOS: privilege escalation via SMM
May 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local privileged attacker can use SMM on some BIOS, in order to
bypass Secure Boot or to flash the firmware.
Impacted products: BIG-IP Hardware, TMOS, Windows (platform) not
comprehensive, Unix (platform) not comprehensive.
Severity: 1/4.
Creation date: 21/04/2016.
DESCRIPTION OF THE VULNERABILITY
The BIOS can use the SMM (System Management Mode) mode.
However, some BIOS implementations allow access outside the SMRAM
memory.
A local privileged attacker can therefore use SMM on some BIOS, in
order to bypass Secure Boot or to flash the firmware.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/BIOS-privilege-escalation-via-SMM-19433