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Vulnerability of PolarSSL: accepting a certificate with a CA not authorized to handshake

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 systems: Unix (platform) ~ not comprehensive.
Severity of this alert: 2/4.
Creation date: 04/04/2014.
Références of this alert: VIGILANCE-VUL-14525.

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 not authorized for use in a SSL/TLS handshake.

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.
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This computer threat announce impacts software or systems such as Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this computer vulnerability is medium.

The trust level is of type multiples sources, with an origin of internet server.

An attacker with a expert ability can exploit this cybersecurity alert.

Solutions for this threat 

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