The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a vigilance database and tools to fix them.

Vulnerability of GnuTLS: accepting a certificate with an unknown critical extension

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 products: Unix (platform) ~ not comprehensive.
Severity of this bulletin: 2/4.
Creation date: 04/04/2014.
Références of this threat: VIGILANCE-VUL-14523.

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 an unknown critical extension.

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.
Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

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

Our Vigil@nce team determined that the severity of this weakness 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 weakness bulletin.

Solutions for this threat 

Full bulletin, software filtering, emails, fixes, ... (Request your free trial)

Computer vulnerabilities tracking service 

Vigil@nce provides an application vulnerability patch. The Vigil@nce computer vulnerability tracking service alerts your teams of vulnerabilities or threats impacting your information system.