Advisories

passport-saml-encrypted through 0.1.13 XML Signature Wrapping via Assertion Prepending

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severity
critical
date
Affecting
  • passport-saml-encrypted <= 0.1.13

CWE
  • CWE-347 Improper Verification of Cryptographic Signature
CVSS
9.1
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
Yu Bao, PayPal Cyber Security Team
Description
passport-saml-encrypted through 0.1.13 contains an XML signature wrapping vulnerability where signature verification and assertion extraction use independent XPath lookups with no cross-validation. Attackers holding any validly signed SAML message can prepend a forged unsigned assertion that gets accepted as the verified identity while the genuine signature validates against the original assertion.

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