Headline
GHSA-m974-647v-whv7: Signature bypass via multiple root elements
Impact
A remote attacker may be able to bypass SAML authentication on a website using passport-saml. A successful attack requires that the attacker is in possession of an arbitrary IDP signed XML element. Depending on the IDP used, fully unauthenticated attacks (e.g without access to a valid user) might also be feasible if generation of a signed message can be triggered.
Patches
Users should upgrade to passport-saml 3.2.2 or newer. The issue was also present in the beta releases of node-saml before v4.0.0-beta.5.
Workarounds
Disable SAML authentication.
References
Are there any links users can visit to find out more?
For more information
If you have any questions or comments about this advisory:
- Open a discussion in the node-saml repo
Credits
- Felix Wilhelm of Google Project Zero
Impact
A remote attacker may be able to bypass SAML authentication on a website using passport-saml. A successful attack requires that the attacker is in possession of an arbitrary IDP signed XML element. Depending on the IDP used, fully unauthenticated attacks (e.g without access to a valid user) might also be feasible if generation of a signed message can be triggered.
Patches
Users should upgrade to passport-saml 3.2.2 or newer. The issue was also present in the beta releases of node-saml before v4.0.0-beta.5.
Workarounds
Disable SAML authentication.
References
Are there any links users can visit to find out more?
For more information
If you have any questions or comments about this advisory:
- Open a discussion in the node-saml repo
Credits
- Felix Wilhelm of Google Project Zero
References
- GHSA-m974-647v-whv7
- node-saml/passport-saml@8b7e3f5
- https://github.com/node-saml/passport-saml/releases/tag/v3.2.2
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Passport-SAML is a SAML 2.0 authentication provider for Passport, the Node.js authentication library. A remote attacker may be able to bypass SAML authentication on a website using passport-saml. A successful attack requires that the attacker is in possession of an arbitrary IDP signed XML element. Depending on the IDP used, fully unauthenticated attacks (e.g without access to a valid user) might also be feasible if generation of a signed message can be triggered. Users should upgrade to passport-saml version 3.2.2 or newer. The issue was also present in the beta releases of `node-saml` before version 4.0.0-beta.5. If you cannot upgrade, disabling SAML authentication may be done as a workaround.