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Vigil@nce - GnuPG: key detection by LLC cache

March 2015 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker, who is located in a virtual machine of a computer
performing operations with GnuPG on chosen messages, can analyze
the LLC of this computer, in order to guess a decryption key.

Impacted products: GnuPG

Severity: 1/4

Creation date: 02/03/2015

DESCRIPTION OF THE VULNERABILITY

The GnuPG product implements the modular exponentiation used by
the RSA algorithm.

The LLC (Last Level Cache) cache can be shared between several
cores of a processor. It can for example contain operations of
other virtual machines.

However, during a modular exponentiation operation, a local
attacker can analyze the LLC, to deduce the decryption key.

An attacker, who is located in a virtual machine of a computer
performing operations with GnuPG on chosen messages, can therefore
analyze the LLC of this computer, in order to guess a decryption
key.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/GnuPG-key-detection-by-LLC-cache-16285


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