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Vulnerability of GnuTLS: accepting a certificate self-signed

Synthesis of the vulnerability 

An attacker can create a malicious certificate, which is accepted as valid by GnuTLS, in order to invite the victim to connect to a server setup as a Man-in-the-Middle.
Impacted software: Unix (platform) ~ not comprehensive.
Severity of this computer vulnerability: 2/4.
Creation date: 04/04/2014.
Références of this announce: VIGILANCE-VUL-14524.

Description of the vulnerability 

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

However, this library accepts a certificate with the same issuer and subject, and a valid chain of trust.

An attacker can therefore create a malicious certificate, which is accepted as valid by GnuTLS, in order to invite the victim to connect to a server setup as a Man-in-the-Middle.
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This vulnerability bulletin impacts software or systems such as Unix (platform) ~ not comprehensive.

Our Vigil@nce team determined that the severity of this security note 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 note.

Solutions for this threat 

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