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However, they do not constitute a normative update to the XML Signature specification, and might not be applicable in certain situations.

If you wish to make comments regarding this document, please send them to [email protected](subscribe, archives). Publication as a Working Group Note does not imply endorsement by the Membership.This is a draft document and may be updated, replaced or obsoleted by other documents at any time.It is inappropriate to cite this document as other than work in progress.As will be seen below, certain kinds of transforms may require an enormous amount of processing time and certain external URI references can lead to possible security violations.One recommendation for implementing the XML Signature Recommendation is to first "authenticate" the signature, before running any of these dangerous operations. However an implementation may still choose to disallow these operations even in step 3, if the party is not trusted to perform them.While there are no specific processing rules required by the XML Signature specification, it is critical that applications include key validation processing that is appropriate to their domain of use.

The following XSLT transform contains 4 levels of nested loops, and for each loop it iterates over all the nodes of the document.

In step 1, if the verification key is not known beforehand and needs to be fetched from child element, and this could contain dangerous transforms, insecure external references and infinite loops (see Best Practice #5 and examples below for more information).

Another potential security issue in step 1 is the handling of untrusted public keys in element to validate the key bound to a certificate.

XML Signature may be used in application server systems, where multiple incoming messages are being processed simultaneously.

In this situation incoming messages should be assumed to be possibly hostile with the concern that a single poison message could bring down an entire set of web applications and services.

This flexibility has the downside of increasing the number of possible attacks.