EUVD-2025-27518

Comprehensive Technical Analysis of EUVD-2025-27518

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-27518 is an SQL injection flaw in the "ID" attribute of the SAML response within the Shibboleth Service Provider (SP). This issue arises when the replay cache is configured to use an SQL database as a storage service, and the database connection utilizes the ODBC plugin. The root cause is insufficient escaping of single quotes in the class SQLString (file odbc-store.cpp, lines 253-271).

Severity Evaluation:

• Base Score: 9.1 (CVSS:3.1)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

The high base score indicates a critical vulnerability due to the following factors:

• Attack Vector (AV:N): Network exploitable.
• Attack Complexity (AC:L): Low complexity required for exploitation.
• Privileges Required (PR:N): No privileges are required.
• User Interaction (UI:N): No user interaction is needed.
• Scope (S:U): Unchanged.
• Confidentiality (C:H): High impact on confidentiality.
• Integrity (I:H): High impact on integrity.
• Availability (A:N): No impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Blind SQL Injection: An attacker can inject malicious SQL code into the "ID" attribute of the SAML response. This can be done without direct feedback from the database, making it a blind SQL injection.
• Data Extraction: By crafting specific SQL queries, an attacker can extract arbitrary data from the database, including sensitive information.

Exploitation Methods:

• Crafting Malicious SAML Responses: An attacker can send specially crafted SAML responses to the Shibboleth SP, exploiting the SQL injection vulnerability.
• Automated Tools: Attackers may use automated tools to perform blind SQL injection attacks, systematically extracting data from the database.

3. Affected Systems and Software Versions

Affected Software:

• Shibboleth Service Provider versions up to and including 3.5.0.

Affected Systems:

• Any system running the vulnerable versions of the Shibboleth SP with the replay cache configured to use an SQL database and the ODBC plugin.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade: Upgrade to Shibboleth SP version 3.5.1 or later, which includes a fix for this vulnerability.
• Disable ODBC Plugin: If upgrading is not immediately possible, consider disabling the ODBC plugin and using an alternative storage service.

Long-Term Mitigation:

• Input Validation: Implement robust input validation and sanitization for all user inputs, especially those related to SAML responses.
• Database Security: Ensure that the database is configured with the principle of least privilege, limiting the data accessible through the ODBC plugin.
• Monitoring: Implement monitoring and alerting for suspicious database activities, such as unusual query patterns.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to organizations within the European Union that rely on Shibboleth for identity federation and single sign-on (SSO) services. Given the critical nature of the vulnerability, it could lead to:

• Data Breaches: Unauthorized access to sensitive data stored in the database.
• Compliance Issues: Potential violations of GDPR and other regulatory requirements.
• Reputation Damage: Loss of trust from users and stakeholders due to compromised security.

6. Technical Details for Security Professionals

Vulnerability Details:

• File: odbc-store.cpp
• Lines: 253-271
• Class: SQLString
• Issue: Insufficient escaping of single quotes.

Exploitation Steps:

1. Identify Target: Locate a Shibboleth SP running a vulnerable version.
2. Craft SAML Response: Create a malicious SAML response with an injected SQL payload in the "ID" attribute.
3. Send Response: Send the crafted SAML response to the Shibboleth SP.
4. Extract Data: Use blind SQL injection techniques to extract data from the database.

Detection and Response:

• Log Analysis: Review logs for unusual SAML responses and database queries.
• Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network traffic related to SAML responses.
• Incident Response: Have an incident response plan in place to quickly address any detected exploitation attempts.

References:

• Shibboleth Security Advisory
• SEC-Consult Report
• Shibboleth SP 3.5.1 Download

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risk and protect their sensitive data.