CVE-2023-40178 in node-saml
Summary
by MITRE • 08/24/2023
Node-SAML is a SAML library not dependent on any frameworks that runs in Node. The lack of checking of current timestamp allows a LogoutRequest XML to be reused multiple times even when the current time is past the NotOnOrAfter. This could impact the user where they would be logged out from an expired LogoutRequest. In bigger contexts, if LogoutRequests are sent out in mass to different SPs, this could impact many users on a large scale. This issue was patched in version 4.0.5.
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Analysis
by VulDB Data Team • 09/14/2023
The vulnerability identified as CVE-2023-40178 affects the Node-SAML library, a popular SAML implementation for Node.js environments that operates independently of specific web frameworks. This library serves as a critical component in Single Sign-On (SSO) implementations, enabling secure authentication and authorization flows between Identity Providers and Service Providers. The flaw resides in the library's handling of LogoutRequest XML messages, specifically the absence of proper timestamp validation mechanisms that should verify the current time against the NotOnOrAfter attribute specified in SAML assertions.
The technical implementation flaw represents a failure in time-based validation controls that are fundamental to SAML security protocols. When a LogoutRequest is processed, the library fails to validate whether the current system time has exceeded the expiration time defined by the NotOnOrAfter attribute within the SAML message. This omission creates a window of opportunity for replay attacks where malicious actors can capture and reuse expired LogoutRequest messages. The vulnerability is classified under CWE-352, representing Cross-Site Request Forgery, as it enables unauthorized operations through the manipulation of valid request messages. The flaw directly violates the SAML 2.0 specification requirements for message expiration handling and timestamp validation.
The operational impact of this vulnerability extends beyond individual user sessions to potentially affect large-scale enterprise environments where SAML-based authentication systems are deployed. When LogoutRequests are broadcast to multiple Service Providers simultaneously, the compromised system could trigger mass logout events affecting numerous users across different applications and services. This scenario creates significant disruption to business operations and represents a serious degradation of service availability. The vulnerability could be exploited by attackers to cause unauthorized logouts, potentially leading to session hijacking or denial of service conditions where legitimate users are suddenly disconnected from services they should be able to access. From an adversary perspective, this issue maps to ATT&CK technique T1566.002 for credential access through the exploitation of SAML session management weaknesses.
Mitigation strategies for CVE-2023-40178 require immediate deployment of version 4.0.5 or later, which implements proper timestamp validation for LogoutRequest messages. Organizations should also implement additional monitoring of SAML logout activities to detect anomalous patterns that might indicate exploitation attempts. Network segmentation and access controls around SAML endpoints can help limit the impact if the vulnerability is exploited. Security teams should conduct comprehensive audits of all SAML implementations within their environments, particularly focusing on timestamp validation mechanisms and message expiration handling. Regular security assessments of identity and access management systems should include verification of proper SAML message validation controls. The fix addresses the core issue by implementing proper time-based validation that ensures LogoutRequest messages are only processed when within their valid time window, preventing the reuse of expired authentication tokens and maintaining the integrity of session management processes.