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computer vulnerability bulletin CVE-2014-3603

OpenSAML Java: incomplete certificate validation

Synthesis of the vulnerability

An attacker can use any valid certificate on a malicious server, and then invite an Apache HttpClient 3 to connect there, in order to spy communications even if encryption is used.
Impacted software: Fedora, Mule ESB, OpenSAML-J.
Severity of this computer vulnerability: 2/4.
Consequences of an attack: data reading, data creation/edition.
Attacker's origin: internet server.
Creation date: 07/08/2015.
Références of this announce: CVE-2014-3603, FEDORA-2015-10175, FEDORA-2015-10235, VIGILANCE-VUL-17608.

Description of the vulnerability

The OpenSAML Java library can manage HTTP connections over SSL, using Apache HttpClient 3 (VIGILANCE-VUL-12182).

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, HttpClient 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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