GHSA-x3m8-899r-f7c3 xml-crypto Vulnerable to XML Signature Verification Bypass via DigestValue Comment

• npm xml-crypto: >= 4.0.0, < 6.0.1 → fixed in 6.0.1 • npm xml-crypto: >= 3.0.0, < 3.2.1 → fixed in 3.2.1 • npm xml-crypto: < 2.1.6 → fixed in 2.1.6

Impact An attacker may be able to exploit this vulnerability to bypass authentication or authorization mechanisms in systems that rely on xml-crypto for verifying signed XML documents. The vulnerability allows an attacker to modify a valid signed XML message in a way that still passes signature verification checks. For example, it could be used to alter critical identity or access control attributes, enabling an attacker to escalate privileges or impersonate another user. Patches All versions c7RuVDYo83z2su5uk0Nla8DXcXvKYKgf7tZklJxL/LZ= ``` Code to test Pass in the decrypted version of the document ```js decryptedDocument = ... // yours to implement const digestValues = xpath.select( "//*[local-name()='DigestValue'][count(node()) > 1]", decryptedDocument, ); if (digestValues.length > 0) { // Compromise detected, yours to implement } ```