CVE-2024-45409: The Ruby SAML library vulnerable to a SAML authentication bypass via Incorrect XPath selector

Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system.

This vulnerability was reported by ahacker1 of SecureSAML (ahacker1@securesaml.com)

— GitHub

SAML-Toolkits Ruby SAML could allow a remote attacker to bypass security restrictions, caused by improper validation of signature of the SAML Response. By sending a specially crafted SAML Response/Assertion with arbitrary contents, an attacker could exploit this vulnerability to log in as arbitrary user on the system.

— IBM

The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.

— MITRE

Updates dependencies omniauth-saml to version 2.2.1 and ruby-saml to 1.17.0 to mitigate CVE-2024-45409. This security vulnerability applies only to instances which have configured SAML based authentication.

— GitLab