Multiple Vulnerabilities in Shibboleth Products Leading to DoS and Security Policy Bypass

Multiple vulnerabilities have been identified in Shibboleth Identity Provider and OpenSAML Java library products. These vulnerabilities can be exploited by an attacker to trigger a remote denial of service (DoS) condition and bypass security policies. The vulnerabilities affect Identity Provider and OpenSAML Java library versions prior to 5.2.2. Successful exploitation could lead to disruptions in services relying on Shibboleth for authentication and authorization, potentially impacting access to critical resources. The vendor has released security advisories to address these issues, urging users to apply the necessary patches to mitigate the risks.

Attack Chain

1. An attacker identifies a vulnerable Shibboleth Identity Provider or OpenSAML Java library instance running a version prior to 5.2.2.
2. The attacker crafts a malicious request designed to exploit CVE-2025-7962 or other vulnerabilities.
3. The malicious request is sent to the vulnerable Shibboleth component, potentially targeting a specific endpoint or function.
4. The vulnerable component processes the request, triggering a denial-of-service condition or a security policy bypass.
5. In a DoS attack, the server becomes unresponsive due to resource exhaustion, preventing legitimate users from accessing services.
6. In a security policy bypass, the attacker gains unauthorized access to protected resources or functionalities.
7. The attacker leverages the bypass to perform actions they are not authorized to do.
8. The attacker may further compromise the system or network, depending on the scope of the bypassed security policy.

Impact

Successful exploitation of these vulnerabilities could result in a denial of service, disrupting authentication and authorization services for users relying on Shibboleth. A security policy bypass could grant unauthorized access to sensitive resources and functionalities, potentially leading to data breaches or further system compromise. These vulnerabilities affect Identity Provider and OpenSAML Java library versions prior to 5.2.2.

Recommendation

• Upgrade Shibboleth Identity Provider and OpenSAML Java library to version 5.2.2 or later to remediate the vulnerabilities described in the vendor’s security advisories (https://shibboleth.net/community/advisories/secadv_20260513.txt, https://shibboleth.net/community/advisories/secadv_20260513a.txt, https://shibboleth.net/community/advisories/secadv_20260513b.txt).
• Monitor web server logs for suspicious activity and requests targeting Shibboleth endpoints, using webserver logs.
• Implement rate limiting and input validation to mitigate potential denial-of-service attacks and security policy bypass attempts.