EUVD-2025-3143

Comprehensive Technical Analysis of EUVD-2025-3143

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The Tandoor Recipes application, which is used for managing recipes, planning meals, and building shopping lists, contains a Jinja2 Server-Side Template Injection (SSTI) vulnerability. This vulnerability allows any user to execute arbitrary commands on the server, particularly when the application is deployed using the provided Docker Compose file as root.

Severity Evaluation: The vulnerability has a CVSS Base Score of 10.0, which is the highest possible score, indicating a critical severity. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H breaks down as follows:

• AV:N - Attack Vector: Network
• AC:L - Attack Complexity: Low
• PR:L - Privileges Required: Low
• UI:N - User Interaction: None
• S:C - Scope: Changed
• C:H - Confidentiality: High
• I:H - Integrity: High
• A:H - Availability: High

This indicates that the vulnerability can be exploited remotely with low complexity, requires low privileges, and does not need user interaction. The impact on confidentiality, integrity, and availability is high, and the scope of the vulnerability changes, affecting components beyond the initial security scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Code Execution (RCE): An attacker can inject malicious code into the Jinja2 templates, leading to arbitrary command execution on the server.
• Privilege Escalation: If the Docker Compose file runs the application as root, an attacker can gain root-level access to the server.

Exploitation Methods:

• Template Injection: By crafting specific input that includes Jinja2 template syntax, an attacker can inject code that will be executed on the server.
• Command Injection: Once the attacker gains the ability to execute commands, they can perform various malicious activities such as data exfiltration, system modification, or further exploitation.

3. Affected Systems and Software Versions

Affected Systems:

• Any server running the Tandoor Recipes application version < 1.5.24.
• Systems using the provided Docker Compose file to deploy the application as root.

Software Versions:

• Tandoor Recipes versions prior to 1.5.24 are vulnerable.

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Software: Upgrade to Tandoor Recipes version 1.5.24 or later, which includes the fix for this vulnerability.
• Limit Privileges: Ensure that the application is not running as root. Use a non-privileged user to run the Docker container.
• Input Validation: Implement strict input validation and sanitization to prevent template injection attacks.

Long-Term Strategies:

• Regular Patching: Establish a regular patching and update schedule for all software components.
• Security Audits: Conduct regular security audits and code reviews to identify and mitigate potential vulnerabilities.
• Least Privilege Principle: Apply the principle of least privilege to all services and applications.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• Organizations using Tandoor Recipes must ensure compliance with GDPR and other relevant regulations by addressing this vulnerability promptly.
• Failure to mitigate this vulnerability could result in data breaches, leading to regulatory fines and reputational damage.

Cybersecurity Posture:

• The high severity of this vulnerability underscores the importance of robust cybersecurity practices, including regular updates and proactive threat detection.
• European organizations should prioritize cybersecurity training and awareness programs to reduce the risk of similar vulnerabilities being exploited.

6. Technical Details for Security Professionals

Vulnerability Details:

• The vulnerability is located in the template_helper.py file, specifically around line 95.
• The Jinja2 template engine is used to render templates, and the vulnerability arises from improper handling of user input within these templates.

References:

• GitHub Advisory: GHSA-r6rj-h75w-vj8v
• Fix Commit: e6087d5129cc9d0c24278948872377e66c2a2c20
• Code Reference: template_helper.py

Mitigation Steps:

1. Update Application: Ensure all instances of Tandoor Recipes are updated to version 1.5.24 or later.
2. Review Docker Configuration: Modify the Docker Compose file to run the application with a non-root user.
3. Implement Security Best Practices: Regularly review and update security policies and procedures to prevent similar vulnerabilities in the future.

By addressing this vulnerability promptly and thoroughly, organizations can significantly reduce the risk of a successful attack and maintain a strong cybersecurity posture.