EUVD-2024-0981

Comprehensive Technical Analysis of EUVD-2024-0981

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in Symfony 1, a PHP framework, involves a gadget chain due to dangerous deserialization in the sfNamespacedParameterHolder class. This flaw allows an attacker to achieve remote code execution (RCE) if a developer deserializes user input in their project.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.8, which is considered critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates:

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

This high severity score underscores the critical nature of the vulnerability, which can lead to full system compromise.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: An attacker can exploit this vulnerability over the network without requiring any user interaction.
• Deserialization of Untrusted Data: The primary attack vector involves deserializing user input, which can be manipulated to trigger the gadget chain leading to RCE.

Exploitation Methods:

• Crafted Payloads: An attacker can craft a malicious payload that, when deserialized, triggers the gadget chain in the sfNamespacedParameterHolder class.
• Web Application Inputs: Any input fields or parameters in web applications using Symfony 1 that deserialize user input are potential entry points for exploitation.

3. Affected Systems and Software Versions

Affected Versions:

• Symfony 1 versions starting from 1.1.0 up to but not including 1.5.19.

Affected Systems:

• Any web application or service built using the affected versions of Symfony 1.
• Systems that process user input and deserialize it using the vulnerable sfNamespacedParameterHolder class.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Upgrade to Version 1.5.19: The most effective mitigation is to upgrade to Symfony 1 version 1.5.19, which contains the patch for this issue.
• Disable Deserialization: If upgrading is not immediately possible, disable deserialization of user input.

Long-Term Mitigation:

• Input Validation: Implement strict input validation and sanitization to ensure that only expected data formats are processed.
• Use Secure Deserialization Libraries: If deserialization is necessary, use libraries that provide secure deserialization mechanisms.
• Regular Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.

5. Impact on European Cybersecurity Landscape

Impact Assessment:

• Widespread Use: Symfony 1 is widely used in web applications across Europe, making this vulnerability a significant risk.
• Critical Infrastructure: Web applications used in critical infrastructure, such as healthcare, finance, and government services, are at risk of compromise.
• Data Breaches: The high confidentiality, integrity, and availability impact scores indicate potential for severe data breaches and service disruptions.

Regulatory Compliance:

• GDPR: Organizations must ensure compliance with GDPR by protecting personal data from unauthorized access and breaches.
• NIS Directive: Critical infrastructure providers must adhere to the Network and Information Systems (NIS) Directive to maintain security and resilience.

6. Technical Details for Security Professionals

Technical Analysis:

• Gadget Chain: The vulnerability involves a gadget chain, a series of method calls that can be triggered during deserialization to achieve RCE.
• sfNamespacedParameterHolder Class: The specific class involved in the deserialization process that contains the vulnerable code.
• Patch Details: The patch in version 1.5.19 addresses the deserialization issue by ensuring that only trusted data is deserialized.

References:

• GitHub Advisory: GHSA-pv9j-c53q-h433
• CVE Details: CVE-2024-28861
• Source Code: Symfony 1 Repository
• Patch Commit: Commit 0bd9d59c69221f49bfc8be8b871b79e12d7d171a

Conclusion: This vulnerability in Symfony 1 poses a significant risk to web applications and services using the affected versions. Immediate action, including upgrading to the patched version and implementing robust input validation, is crucial to mitigate the risk of remote code execution and potential data breaches.