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Vulnerability of Bouncy Castle: bypassing TLS Server client-auth

Synthesis of the vulnerability 

An attacker can offer an invalid client certificate to the DTSL/TLS server of Bouncy Castle, in order to bypass the authentication.
Vulnerable products: Bouncy Castle JCE.
Severity of this weakness: 3/4.
Creation date: 17/04/2014.
Références of this bulletin: VIGILANCE-VUL-14610.

Description of the vulnerability 

The Bouncy Castle product implements a DTLS/TLS server.

This server can use TlsServer.getCertificateRequest() to require a X.509 certificate from the client. However, if the attacker offers an invalid certificate, this function returns no error.

An attacker can therefore offer an invalid client certificate to the DTSL/TLS server of Bouncy Castle, in order to bypass the authentication.
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This computer weakness bulletin impacts software or systems such as Bouncy Castle JCE.

Our Vigil@nce team determined that the severity of this computer threat announce is important.

The trust level is of type confirmed by the editor, with an origin of internet client.

A proof of concept or an attack tool is available, so your teams have to process this alert. An attacker with a technician ability can exploit this threat announce.

Solutions for this threat 

Bouncy Castle: version 1.51b12.
The version 1.51b12 is fixed:
  http://www.downloads.bouncycastle.org/betas

Bouncy Castle: workaround for TLS Server client-auth.
A workaround is indicated in the information source.
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