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Exploit could attack systems via Intel chips

updated 02:45 pm EDT, Thu March 19, 2009

Intel SMM Security Exploit

Joanna Rutkowska of Invisible Things Lab today posted details of a security exploit that could compromise many systems using Intel processors. The techinque involves "poisoning" a given chip's cache memory and forcing access to System Management Mode (SMM), which addresses errors, power management and other features outside of normal processor use. A successful attack would let the attacker either dump the contents of RAM used for SMM so that it can be more easily compromised or else to run arbitrary code from the memory.

Intel notes that some of its platforms should already be immune against the exploit, though some relatively recent self-produced mainboards like the DQ35 still open the door to potential attacks. The company is reportedly developing fixes for at least some systems.

It's unclear whether such security breaches are applicable to any operating system, though the nature of the discovery is theoretically independent of software. More details should be available following a presentation at CanSecWest today.




by MacNN Staff

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  1. bigjimid

    Joined: Dec 1969

    0

    Intel chips?

    I wonder why only Intel chips are effected from this "poisoning", and not others.

  1. testudo

    Joined: Dec 1969

    0

    Re: Intel chips

    Probably because of the underlying software on the chip, such that 'poisoning' the cache kicks in some code that then allows the access.

    Just like how abnormal use of an API or program could cause an OS to run code it shouldn't, or elevate permissions for a process which shouldn't be elevated.

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