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Vigil@nce - PolarSSL: accepting a certificate not yet valid

April 2014 by Vigil@nce

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

SYNTHESIS OF THE VULNERABILITY

An attacker can create a malicious certificate, which is accepted
as valid by PolarSSL, in order to invite the victim to connect to
a server setup as a Man-in-the-Middle.

 Impacted products: Unix (platform)
 Severity: 2/4
 Creation date: 04/04/2014

DESCRIPTION OF THE VULNERABILITY

The PolarSSL library implements the SSL/TLS protocol. It has to
perform checks on X.509 certificates.

However, this library accepts a certificate with a validity start
date in the future.

An attacker can therefore create a malicious certificate, which is
accepted as valid by PolarSSL, in order to invite the victim to
connect to a server setup as a Man-in-the-Middle.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/PolarSSL-accepting-a-certificate-not-yet-valid-14527


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