EUVD-2025-5807

Comprehensive Technical Analysis of EUVD-2025-5807

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability EUVD-2025-5807 pertains to an "Improper Restriction of Operations within the Bounds of a Memory Buffer" in the libwebsockets library. This flaw allows for Pointer Manipulation, which can lead to out-of-bounds memory access. The issue is present in versions of libwebsockets before 4.3.4 and specifically affects code built for the Win32 platform.

Severity Evaluation: The vulnerability has a CVSS Base Score of 10.0, indicating a critical severity level. The CVSS vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H highlights the following:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Confidentiality (VC), Integrity (VI), and Availability (VA) Impact: High (H)
• Scope Change (SC): High (H)
• Scope Integrity (SI) and Scope Availability (SA): High (H)

This high severity score underscores the potential for significant damage if exploited.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the AV:N vector, attackers can exploit this vulnerability over the network without requiring local access.
• Pointer Manipulation: Attackers can manipulate pointers to access memory outside the intended buffer, leading to memory corruption.

Exploitation Methods:

• Out-of-Bounds Access: By manipulating pointers, attackers can read or write to memory locations outside the allocated buffer, potentially leading to data leakage, code execution, or system crashes.
• Memory Corruption: Exploiting this vulnerability can result in memory corruption, which can be leveraged to execute arbitrary code or cause denial-of-service conditions.

3. Affected Systems and Software Versions

Affected Software:

• libwebsockets versions before 4.3.4
• Specifically affects code built for the Win32 platform

Conditions for Execution:

• The vulnerability is triggered only if certain CMake options are set:
  • LWS_WITHOUT_EXTENSIONS is set to OFF (default is ON)
  • LWS_WITH_HTTP_STREAM_COMPRESSION is set to ON (default is OFF)

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Update Software: Upgrade to libwebsockets version 4.3.4 or later, which includes the fix for this vulnerability.
• Disable Affected Features: Ensure that the CMake options LWS_WITHOUT_EXTENSIONS and LWS_WITH_HTTP_STREAM_COMPRESSION are set to their default values to avoid triggering the vulnerability.

Long-Term Mitigation:

• Regular Patching: Implement a regular patching and update schedule for all software dependencies.
• Code Review: Conduct thorough code reviews and static analysis to identify and mitigate similar vulnerabilities.
• Network Security: Implement network security measures such as firewalls and intrusion detection systems to monitor and block suspicious network activities.

5. Impact on European Cybersecurity Landscape

Potential Impact:

• Critical Infrastructure: Given the widespread use of libwebsockets in various applications, including critical infrastructure, the vulnerability poses a significant risk to European cybersecurity.
• Data Integrity and Confidentiality: Exploitation can lead to data breaches, loss of data integrity, and unauthorized access to sensitive information.
• Service Disruption: The potential for denial-of-service conditions can disrupt essential services, affecting businesses and public services.

Regulatory Compliance:

• GDPR: Organizations must ensure that personal data is protected, and any breach resulting from this vulnerability could lead to GDPR violations.
• NIS Directive: Critical infrastructure providers must comply with the Network and Information Systems (NIS) Directive, ensuring robust cybersecurity measures are in place.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2025-1866
• GHSA ID: GHSA-w9v7-r27g-jrmx
• Affected Product: libwebsockets
• Affected Versions: 0 << 4.3.4
• Vendor: warmcat

References:

• NVD Entry
• GitHub Commit

Technical Recommendations:

• Memory Safety: Implement memory safety techniques such as bounds checking and safe memory management practices.
• Static Analysis: Use static analysis tools to detect and mitigate similar vulnerabilities during the development process.
• Fuzz Testing: Employ fuzz testing to identify and fix memory-related vulnerabilities in the software.

Conclusion: The vulnerability EUVD-2025-5807 in libwebsockets poses a critical risk to systems using the affected versions. Immediate mitigation through software updates and configuration changes is essential. Long-term strategies, including regular patching, code reviews, and network security measures, are crucial for maintaining robust cybersecurity posture. The potential impact on European cybersecurity underscores the need for vigilant monitoring and compliance with regulatory requirements.