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Vulnerability of OpenSAML Java: incomplete certificate validation

Synthesis of the vulnerability 

An attacker can use any valid certificate on a malicious server, and then invite an OpenSAML Java to connect there, in order to spy communications even if encryption is used.
Impacted software: OpenSAML-J.
Severity of this computer vulnerability: 2/4.
Creation date: 22/09/2014.
Références of this announce: CVE-2014-3607, VIGILANCE-VUL-15388.

Description of the vulnerability 

The OpenSAML Java product can manage HTTP or LDAP connections over SSL.

In order to authenticate a server, the client must check the certificate (cryptographic signatures, validity date range, etc.) and also that the received certificate matches the visited server. This check is usually done on DNS names, or sometimes on IP addresses. However, OpenSAML Java does not check that the names included in the certificates match the one requested at HTTP level. So, any valid certificate is accepted.

An attacker can therefore use any valid certificate on a malicious server, and then invite an OpenSAML Java to connect there, in order to spy communications even if encryption is used.
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This computer threat impacts software or systems such as OpenSAML-J.

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

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

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

Solutions for this threat 

OpenSAML Java: version 2.6.3.
The version 2.6.3 is fixed:
  http://shibboleth.net/products/opensaml-java.html
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