Description
A missing authentication enforcement vulnerability exists in the mutual TLS (mTLS) implementation used by System REST APIs and SOAP services in multiple WSO2 products. Due to improper validation of client certificate–based authentication in certain default configurations, the affected components may permit unauthenticated requests even when mTLS is enabled. This condition occurs when relying on the default mTLS settings for System REST APIs or when the mTLS authenticator is enabled for SOAP services, causing these interfaces to accept requests without enforcing additional authentication. Successful exploitation allows a malicious actor with network access to the affected endpoints to gain administrative privileges and perform unauthorized operations. The vulnerability is exploitable only when the impacted mTLS flows are enabled and accessible in a given deployment. Other certificate-based authentication mechanisms such as Mutual TLS OAuth client authentication and X.509 login flows are not affected, and APIs served through the API Gateway of WSO2 API Manager remain unaffected.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-197988
1. Vulnerability Assessment and Severity Evaluation
Vulnerability Description: The vulnerability EUVD-2025-197988 pertains to a missing authentication enforcement in the mutual TLS (mTLS) implementation used by System REST APIs and SOAP services in multiple WSO2 products. Due to improper validation of client certificate–based authentication in certain default configurations, the affected components may permit unauthenticated requests even when mTLS is enabled.
Severity Evaluation:
- Base Score: 9.8
- Base Score Version: 3.1
- Base Score Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The high base score of 9.8 indicates a critical vulnerability. The CVSS vector breakdown shows that the vulnerability can be exploited over the network (AV:N), requires low complexity (AC:L), does not need privileges (PR:N) or user interaction (UI:N), and has a high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Network Access: An attacker with network access to the affected endpoints can exploit this vulnerability.
- Unauthenticated Requests: The attacker can send unauthenticated requests to the System REST APIs or SOAP services, bypassing the mTLS authentication.
Exploitation Methods:
- Direct Exploitation: By crafting malicious requests, an attacker can gain administrative privileges and perform unauthorized operations.
- Automated Scripts: Attackers can use automated scripts to send a high volume of unauthenticated requests, potentially leading to denial of service (DoS) conditions.
3. Affected Systems and Software Versions
Affected Products and Versions:
- WSO2 API Manager: Various versions including 2.2.0, 2.5.0, 3.0.0, 3.1.0, 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0, 4.5.0
- WSO2 Identity Server: Various versions including 5.10.0, 5.4.0, 5.3.0, 5.7.0, 5.9.0, 6.0.0, 6.1.0, 7.0.0, 7.1.0
- WSO2 Identity Server as Key Manager: Various versions including 5.3.0, 5.5.0, 5.6.0, 5.7.0, 5.9.0, 5.10.0
- WSO2 Universal Gateway: Version 4.5.0
- WSO2 Open Banking AM: Versions 1.4.0, 1.5.0, 2.0.0
- WSO2 Open Banking IAM: Version 2.0.0
- WSO2 Traffic Manager: Version 4.5.0
- WSO2 API Control Plane: Version 4.5.0
- org.wso2.carbon.identity.auth.service: Various versions including 1.1.1, 1.1.16, 1.1.18, 1.1.20, 1.1.26, 1.3.6, 1.4.0, 1.4.25, 1.4.52, 1.6.1, 1.7.1, 1.8.11, 1.9.4, 1.9.18
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Patching: Apply the latest patches and updates provided by WSO2 for the affected products.
- Configuration Review: Ensure that mTLS settings are correctly configured and that additional authentication mechanisms are enforced.
Long-Term Mitigation:
- Regular Audits: Conduct regular security audits and vulnerability assessments.
- Network Segmentation: Implement network segmentation to limit access to critical systems.
- Monitoring: Deploy monitoring tools to detect and respond to unauthorized access attempts.
5. Impact on European Cybersecurity Landscape
Regulatory Compliance:
- GDPR: This vulnerability could lead to unauthorized access to personal data, potentially violating GDPR regulations.
- NIS Directive: Organizations in critical sectors must ensure they comply with the Network and Information Systems (NIS) Directive, which mandates robust cybersecurity measures.
Economic Impact:
- Financial Loss: Unauthorized access could lead to financial losses due to data breaches and operational disruptions.
- Reputation Damage: Organizations suffering from this vulnerability may face reputational damage.
6. Technical Details for Security Professionals
Detection:
- Log Analysis: Monitor logs for unauthenticated access attempts to System REST APIs and SOAP services.
- Intrusion Detection Systems (IDS): Deploy IDS to detect suspicious network activities.
Response:
- Incident Response Plan: Have a well-defined incident response plan to quickly address any detected exploitation attempts.
- Forensic Analysis: Conduct forensic analysis to understand the scope and impact of any successful exploitation.
Prevention:
- Access Controls: Implement strong access controls and multi-factor authentication (MFA) where possible.
- Security Training: Provide regular security training to staff to recognize and respond to potential threats.
Conclusion: The vulnerability EUVD-2025-197988 is critical and requires immediate attention. Organizations using the affected WSO2 products should prioritize patching and implementing robust security measures to mitigate the risk. Regular audits, monitoring, and a proactive security posture are essential to protect against such vulnerabilities and ensure compliance with European cybersecurity regulations.