The message recipient checks that the signature is correct and validates trust in the signing credential. An XML Signature wrapping attack essentially exploits the fact that the Signature Element does not convey any information as to where the referenced Element(s) is(are) in the Document tree.Ĭonsider a scenario where the SOAP Body of a request is signed by a signature placed in the security header of the request. Typically, the message parts are referenced by an Id, and so to validate the signature the recipient must find the Element in the request that has the corresponding Id. The message contains a security header with a Signature Element, that references one or more message parts that have been signed. It is possible to sign a portion of a SOAP Web Service request or response at the message level using XML Signature. In this post we will look at how to protect against XML Signature Wrapping attacks in Apache CXF. The WS-Attacker tool also offers some functionality to test Web Service endpoints for vulnerability against these types of attacks. This paper also covers a different type of attack on WS-Security enabled Web Services, namely XML Signature Wrapping attacks. This vulnerability was uncovered with the help of the WS-Attacker tool referenced here. The previous blog post looked at SOAP Action spoofing attacks on Web Services and discussed a recent security advisory in this area in Apache CXF.
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