EUVD-2023-41596

Comprehensive Technical Analysis of EUVD-2023-41596

1. Vulnerability Assessment and Severity Evaluation

The vulnerability EUVD-2023-41596, also known as CVE-2023-37719, pertains to a stack overflow in the page parameter within the fromP2pListFilter function in specific versions of Tenda F1202 and FH1202 devices. The CVSS (Common Vulnerability Scoring System) base score of 9.8 indicates a critical severity level. The vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:

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

This high score underscores the potential for severe impact on confidentiality, integrity, and availability of the affected systems.

2. Potential Attack Vectors and Exploitation Methods

Given the nature of the vulnerability, potential attack vectors include:

• Remote Exploitation: An attacker can exploit this vulnerability over the network without requiring any user interaction or special privileges.
• Buffer Overflow: The stack overflow can be triggered by sending specially crafted input to the page parameter, leading to arbitrary code execution.
• Denial of Service (DoS): Exploiting the stack overflow can cause the device to crash, resulting in a denial of service.

Exploitation methods may involve:

• Crafting Malicious Input: An attacker can craft a malicious input to the page parameter to overflow the stack.
• Code Execution: By carefully manipulating the input, an attacker can execute arbitrary code on the device.
• Network Scanning: Attackers can scan for vulnerable devices on the network and exploit them remotely.

3. Affected Systems and Software Versions

The vulnerability affects the following Tenda devices and firmware versions:

• Tenda F1202 V1.0BR_V1.2.0.20(408)
• Tenda FH1202_V1.2.0.19_EN

Users and administrators of these devices should be particularly vigilant and take immediate action to mitigate the risk.

4. Recommended Mitigation Strategies

To mitigate the risk associated with this vulnerability, the following strategies are recommended:

• Firmware Update: Ensure that the devices are updated to the latest firmware version provided by Tenda. Regularly check for updates and apply them promptly.
• Network Segmentation: Isolate vulnerable devices on separate network segments to limit the potential impact of an exploit.
• Firewall Rules: Implement strict firewall rules to restrict access to the vulnerable devices, allowing only necessary traffic.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor network traffic for suspicious activity that may indicate an attempt to exploit this vulnerability.
• Regular Audits: Conduct regular security audits and vulnerability assessments to identify and address potential security issues.

5. Impact on European Cybersecurity Landscape

The presence of this vulnerability in widely used IoT devices like Tenda routers poses a significant risk to the European cybersecurity landscape. The potential for remote exploitation and the high impact on confidentiality, integrity, and availability make it a critical concern for both individual users and organizations. The widespread use of such devices in homes and small businesses increases the attack surface, making it essential for European cybersecurity authorities to address this issue promptly.

6. Technical Details for Security Professionals

For security professionals, the following technical details are pertinent:

• Vulnerable Function: The vulnerability resides in the fromP2pListFilter function, specifically in the handling of the page parameter.
• Stack Overflow: The stack overflow occurs due to improper bounds checking on the page parameter, allowing an attacker to overwrite adjacent memory.
• Exploit Development: Crafting an exploit involves sending a specially crafted input to the page parameter to trigger the stack overflow and execute arbitrary code.
• Detection: Monitoring network traffic for unusual patterns or large payloads directed at the page parameter can help detect potential exploitation attempts.
• Patch Analysis: Review the patch provided by Tenda to understand the changes made to mitigate the vulnerability and ensure similar issues are not present in other functions.

Conclusion

EUVD-2023-41596 represents a critical vulnerability in Tenda F1202 and FH1202 devices that requires immediate attention. The potential for remote exploitation and severe impact on system security necessitates prompt mitigation strategies, including firmware updates, network segmentation, and enhanced monitoring. Security professionals should remain vigilant and proactive in addressing this vulnerability to protect the European cybersecurity landscape.

References

• GitHub Report
• Mitre CVE
• ENISA