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CVE-2022-39299 is an authentication bypass in the Passport-SAML (passport-saml) SAML 2.0 strategy for Passport (Node.js), also affecting node-saml beta releases prior to 4.0.0-beta.5. The issue stems from XML parsing/validation behavior that permits non-well-formed XML with multiple top-level (root) elements, which can break assumptions made during XML signature validation. An attacker who can supply a SAML message containing an IdP-signed XML element can leverage this to bypass SAML authentication checks in applications using the affected libraries.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (2 hidden).
This repository provides a proof-of-concept exploit for CVE-2022-39299, a signature bypass vulnerability in the 'passport-saml' library used for SAML SSO authentication in Node.js applications. The exploit targets multi-tenant platforms that allow custom SAML IdP configuration. The core of the exploit is the 'payloadGenerator.py' script, which constructs a malicious SAML response with two root elements: a signed error message (from 'base_payload.xml') and an unsigned assertion (from 'payload_appendix.xml') containing attacker-controlled authentication data. The script signs the error message using the provided 'cert.pem' and 'key.pem', appends the tampered assertion, and outputs the payload in a format suitable for delivery to the target's SAML login endpoint. The exploit demonstrates how an attacker can bypass authentication and impersonate any user if the target's SAML logic is vulnerable. The repository includes all necessary files for payload generation and clear instructions in the README.md for setting up a test environment and reproducing the attack.
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