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Vigil@nce - OpenSSL: denial of service via ServerKeyExchange

February 2016 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can send a malicious ServerKeyExchange message to a
client compiled with OpenSSL, in order to trigger a denial of
service.

Impacted products: IRAD, Data ONTAP, OpenSSL, Puppet, Slackware,
Ubuntu.

Severity: 2/4.

Creation date: 04/12/2015.

DESCRIPTION OF THE VULNERABILITY

The OpenSSL library implements TLS with the anonymous DH
ciphersuite.

However, if the TLS server sends a ServerKeyExchange message with
a value of p parameter set to zero, a fatal error occurs in the
client linked to OpenSSL.

An attacker can therefore send a malicious ServerKeyExchange
message to a client compiled with OpenSSL, in order to trigger a
denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/OpenSSL-denial-of-service-via-ServerKeyExchange-18443


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