CVE-2023-51957

Comprehensive Technical Analysis of CVE-2023-51957

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2023-51957 Description: Tenda AX1803 v1.0.0.1 contains a stack overflow vulnerability via the iptv.stb.mode parameter in the function formGetIptv. CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for remote code execution (RCE), which can lead to complete system compromise. The stack overflow can be exploited to overwrite critical memory areas, allowing an attacker to execute arbitrary code.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can send a specially crafted HTTP request to the vulnerable device, targeting the iptv.stb.mode parameter.
• Network-Based Attacks: Since the vulnerability is in a network-accessible function, it can be exploited over the network, making it a prime target for remote attacks.

Exploitation Methods:

• Buffer Overflow: By sending a large payload to the iptv.stb.mode parameter, an attacker can cause a stack overflow, leading to arbitrary code execution.
• Payload Delivery: The attacker can craft a payload that includes shellcode or other malicious code to be executed on the vulnerable device.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AX1803 routers running firmware version v1.0.0.1.

Software Versions:

• Specifically, the vulnerability is present in the formGetIptv function of the firmware version v1.0.0.1.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Users should immediately update their Tenda AX1803 routers to the latest firmware version that addresses this vulnerability.
• Network Segmentation: Isolate the affected devices from critical networks to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the device's web interface.

Long-Term Mitigation:

• Regular Patching: Establish a regular patching and update schedule for all network devices.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity targeting the vulnerable function.
• Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Supply Chain Security: This vulnerability highlights the importance of securing the supply chain, as routers are critical components in both home and enterprise networks.
• IoT Security: With the increasing number of IoT devices, ensuring the security of firmware and software updates is paramount.
• Remote Workforce: The vulnerability underscores the risks associated with remote work, where home routers can become entry points for attacks on corporate networks.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: formGetIptv
• Parameter: iptv.stb.mode
• Vulnerability Type: Stack Overflow

Exploitation Steps:

1. Identify Target: Scan the network to identify Tenda AX1803 routers running the vulnerable firmware.
2. Craft Payload: Develop a payload that exceeds the buffer size for the iptv.stb.mode parameter.
3. Deliver Payload: Send the crafted payload via an HTTP request to the router's web interface.
4. Execute Code: If successful, the payload will overwrite the stack and execute the attacker's code.

Detection and Response:

• Log Analysis: Monitor logs for unusual activity related to the formGetIptv function.
• Anomaly Detection: Use anomaly detection tools to identify abnormal traffic patterns targeting the router.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any successful exploitation attempts.

Conclusion: CVE-2023-51957 represents a significant risk to users of Tenda AX1803 routers. Immediate action is required to update the firmware and implement additional security measures to protect against potential exploitation. The broader cybersecurity community should take note of the vulnerability to enhance overall network security practices and protocols.