CVE-2022-39299 in Passport-SAML
Summary
by MITRE • 10/13/2022
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.
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Analysis
by VulDB Data Team • 11/07/2022
The vulnerability identified as CVE-2022-39299 affects passport-saml, a widely used SAML 2.0 authentication provider for Node.js applications that integrates with the Passport authentication library. This authentication mechanism is critical for enterprise applications that rely on single sign-on capabilities, making the vulnerability particularly concerning for organizations implementing federated identity solutions. The flaw resides in the SAML authentication processing logic where insufficient validation occurs on signed XML elements received from identity providers, creating a pathway for authentication bypass scenarios that could compromise the security posture of affected systems.
The technical implementation flaw stems from inadequate verification of SAML assertion signatures and XML element integrity checks within the passport-saml library. Attackers can exploit this weakness by crafting maliciously signed XML elements that appear valid to the authentication system, potentially allowing unauthorized access without proper user credentials. The vulnerability specifically targets the validation process where the library accepts signed elements without sufficient cryptographic verification, enabling attackers who possess access to any valid identity provider signed XML content to manipulate the authentication flow. This weakness operates at the intersection of cryptographic validation and XML processing, creating an attack surface where the system trusts malformed or manipulated signed assertions.
The operational impact of this vulnerability extends beyond simple authentication bypass to potentially enable full unauthorized access to protected applications and services. Depending on the identity provider implementation and the specific attack vector utilized, attackers might achieve completely unauthenticated access to systems, eliminating the need for legitimate user credentials or session tokens. This represents a significant risk for organizations relying on SAML-based authentication, as it could allow attackers to gain access to sensitive data, perform administrative functions, or establish persistent access within the target environment. The vulnerability's impact is amplified in environments where SAML authentication serves as a primary or sole authentication mechanism for critical applications.
Organizations affected by this vulnerability should prioritize immediate remediation through upgrading to passport-saml version 3.2.2 or later, which includes the necessary cryptographic validation fixes. The vulnerability also affected beta releases of node-saml library before version 4.0.0-beta.5, indicating that the issue was present across multiple components of the SAML implementation ecosystem. When immediate upgrades are not feasible, administrators should consider disabling SAML authentication as a temporary workaround, though this may impact legitimate user access and should be implemented with careful consideration of business continuity requirements. This vulnerability aligns with CWE-347, which addresses improper verification of cryptographic signatures, and represents a potential technique within the ATT&CK framework under credential access and privilege escalation tactics. The security implications underscore the importance of maintaining up-to-date authentication libraries and implementing proper cryptographic validation processes to prevent similar vulnerabilities from compromising enterprise security infrastructures.