All users of pysaml2 that use the default CryptoBackendXmlSec1
backend and need to verify signed SAML documents are impacted. pysaml2 <= 6.4.1
does not validate the SAML document against an XML schema. This allows invalid XML documents to trick the verification process, by presenting elements with a valid signature inside elements whose content has been malformed. The verification is offloaded to xmlsec1
and xmlsec1
will not validate every signature in the given document, but only the first it finds in the given scope.
Users should upgrade to pysaml2 v6.5.0
.
No workaround provided at this point.
No references provided at this point.
If you have any questions or comments about this advisory: * Open an issue in pysaml2 * Email us at the incident-response address