CVE-2024-37357

Comprehensive Technical Analysis of CVE-2024-37357

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2024-37357 CVSS Score: 9.1

The vulnerability in question is a buffer overflow in the adm.cgi set_TR069() functionality of the Wavlink AC3000 M33A8.V5030.210505 router. This vulnerability allows an attacker to send a specially crafted HTTP request, leading to a stack-based buffer overflow. The high CVSS score of 9.1 indicates that this vulnerability is critical, posing a significant risk to affected systems.

Severity Evaluation:

• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

The severity is high due to the potential for remote code execution, which can compromise the confidentiality, integrity, and availability of the affected device.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Authenticated HTTP Request: An attacker needs to be authenticated to exploit this vulnerability. This could be achieved through credential theft, brute-forcing, or exploiting other vulnerabilities that allow unauthorized access.
• Network Access: The attacker must have network access to the device, which could be achieved through local network access or remote access if the device is exposed to the internet.

Exploitation Methods:

• Crafted HTTP Request: The attacker sends a specially crafted HTTP request to the adm.cgi endpoint, targeting the set_TR069() function.
• Buffer Overflow: The crafted request causes a stack-based buffer overflow, potentially leading to arbitrary code execution.

3. Affected Systems and Software Versions

Affected Systems:

• Wavlink AC3000 M33A8.V5030.210505

Software Versions:

• Firmware version M33A8.V5030.210505

It is crucial to identify and update all devices running the affected firmware version to mitigate the risk.

4. Recommended Mitigation Strategies

Immediate Actions:

• Firmware Update: Apply the latest firmware update provided by Wavlink to patch the vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit potential damage.
• Access Control: Implement strong authentication mechanisms and regularly update credentials.

Long-Term Strategies:

• Regular Patching: Establish a routine for regularly updating firmware and software.
• Intrusion Detection: Deploy intrusion detection systems (IDS) to monitor for suspicious activity.
• Security Audits: Conduct regular security audits and vulnerability assessments.

5. Impact on Cybersecurity Landscape

The discovery of this vulnerability highlights the ongoing risk posed by buffer overflow issues in embedded systems. It underscores the importance of secure coding practices and regular security audits for IoT devices. The high CVSS score indicates that such vulnerabilities can have severe consequences, including unauthorized access, data breaches, and potential takeover of networked devices.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: set_TR069() in adm.cgi
• Type of Overflow: Stack-based buffer overflow
• Trigger: Specially crafted HTTP request

Exploitation Steps:

1. Authentication: Obtain valid credentials for the device.
2. Crafted Request: Construct an HTTP request targeting the set_TR069() function with a payload designed to overflow the buffer.
3. Execution: Send the request to the device, causing the buffer overflow and potentially executing arbitrary code.

Detection:

• Log Analysis: Monitor HTTP request logs for unusual patterns or payloads targeting the adm.cgi endpoint.
• Memory Analysis: Use tools to analyze the device's memory for signs of buffer overflow and unauthorized code execution.

Mitigation:

• Input Validation: Ensure proper input validation and sanitization in the set_TR069() function.
• Code Review: Conduct a thorough code review to identify and fix similar vulnerabilities.

References:

• Talos Intelligence Report
• Additional Report

By addressing this vulnerability promptly and implementing robust security measures, organizations can significantly reduce the risk of exploitation and protect their networked devices from potential attacks.