CVE-2012-5353 in Openathens Service Provider
Summary
by MITRE
Eduserv OpenAthens SP 2.0 for Java allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a "Signature exclusion attack."
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Analysis
by VulDB Data Team • 02/05/2018
The vulnerability identified as CVE-2012-5353 affects Eduserv OpenAthens SP 2.0 for Java, a single sign-on solution designed for educational institutions. This flaw represents a critical security weakness in the SAML (Security Assertion Markup Language) implementation that enables unauthorized users to bypass authentication mechanisms. The vulnerability specifically targets the signature validation process within the SAML assertion handling, creating a pathway for malicious actors to forge authentication messages and gain unauthorized access to protected resources.
The technical flaw stems from the application's insufficient validation of SAML assertions that lack signature elements. In proper SAML implementations, assertions should contain cryptographic signatures to verify their authenticity and integrity. However, the OpenAthens SP 2.0 for Java fails to enforce mandatory signature validation, allowing attackers to submit SAML assertions without signatures. This omission creates a signature exclusion attack vector where malicious users can craft fake assertions that appear legitimate to the relying party, effectively bypassing the authentication process. The vulnerability is classified under CWE-347 as "Improper Verification of Cryptographic Signature," which directly addresses the failure to properly validate digital signatures in security-critical contexts.
The operational impact of this vulnerability is severe for educational institutions relying on OpenAthens for identity management. Attackers can exploit this weakness to gain unauthorized access to protected academic resources, student data, and institutional systems without proper authentication credentials. This creates a significant risk of data breaches, unauthorized access to sensitive information, and potential disruption of educational services. The attack can be executed remotely without requiring any privileged access or complex exploitation techniques, making it particularly dangerous. The vulnerability undermines the fundamental security model of SAML-based single sign-on implementations, where trust is established through cryptographic verification of assertions.
Organizations using Eduserv OpenAthens SP 2.0 for Java should implement immediate mitigations to address this vulnerability. The primary recommendation involves configuring the application to enforce mandatory signature validation for all incoming SAML assertions, ensuring that any assertion lacking a valid signature is rejected. Security administrators should also consider implementing additional monitoring and logging mechanisms to detect suspicious authentication attempts. The mitigation strategy aligns with ATT&CK technique T1566.002 for credential access through SAML-based authentication bypass. Organizations should also review their SAML implementation against industry standards such as NIST SP 800-63B and ISO/IEC 27017 to ensure proper cryptographic signature validation. Patch management should be prioritized, with vendors encouraged to release updated versions that properly enforce SAML signature validation. Regular security assessments and penetration testing should be conducted to verify that the implemented controls effectively prevent signature exclusion attacks and maintain the integrity of the authentication infrastructure.