Versions of samlify prior to 2.4.0-rc5 are vulnerable to Authentication Bypass. The package fails to prevent XML Signature Wrapping, allowing tokens to be reused with different usernames. A remote attacker can modify SAML content for a SAML service provider without invalidating the cryptographic signature, which may allow attackers to bypass primary authentication for the affected SAML service provider.

Recommendation

Upgrade to version 2.4.0-rc5 or later

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-1000452
• https://hackerone.com/reports/356284
• https://www.whitehats.nl/blog/xml-signature-wrapping-samlify
• tngan/samlify@d382bbc
• tngan/samlify@v2.4.0-rc4...v2.4.0-rc5
• https://github.com/tngan/samlify/releases/tag/v2.4.0-rc5