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Vigil@nce - Bouncy Castle JCE: incorrect computation of NatX.square

December 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can use a computation error in NatX.square() in the
ECDH implementation of Bouncy Castle JCE, in order to obtain a
static key.

 Impacted products: Bouncy Castle JCE.
 Severity: 1/4.
 Creation date: 29/11/2016.

DESCRIPTION OF THE VULNERABILITY

The Bouncy Castle JCE product offers methods to square numbers:
Nat192.square(), Nat256.square(), SecP384R1Field.square(), etc.
These functions are only used to compute with elliptic curves.

However, an error occurs in 1/2^48 cases, which is undetected in
1/2^100 cases. When static (not ephemeral) keys are used with
ECDH, an attacker can thus progressively compute the key.

An attacker can therefore use a computation error in NatX.square()
in the ECDH implementation of Bouncy Castle JCE, in order to
obtain a static key.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Bouncy-Castle-JCE-incorrect-computation-of-NatX-square-21223


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