EUVD-2023-30807

Comprehensive Technical Analysis of EUVD-2023-30807

1. Vulnerability Assessment and Severity Evaluation

The vulnerability identified as EUVD-2023-30807 (also known as CVE-2023-27017 and GSD-2023-27017) pertains to a stack overflow in the Tenda AC10 router firmware version US_AC10V4.0si_V16.03.10.13_cn. This vulnerability is located within the sub_45DC58 function. The stack overflow can be exploited to cause a Denial of Service (DoS) or execute arbitrary code via a crafted payload.

Severity Evaluation:

• CVSS Base Score: 9.8
• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

The high CVSS score of 9.8 indicates a critical vulnerability. The vector string breakdown is as follows:

• AV:N (Attack Vector: Network) - The vulnerability is exploitable over the network.
• AC:L (Attack Complexity: Low) - The attack requires low complexity to exploit.
• PR:N (Privileges Required: None) - No privileges are required to exploit the vulnerability.
• UI:N (User Interaction: None) - No user interaction is required.
• S:U (Scope: Unchanged) - The vulnerability does not change the security scope.
• C:H (Confidentiality: High) - The vulnerability has a high impact on confidentiality.
• I:H (Integrity: High) - The vulnerability has a high impact on integrity.
• A:H (Availability: High) - The vulnerability has a high impact on availability.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Network-Based Attacks: Given the AV:N vector, attackers can exploit this vulnerability remotely over the network.
• Crafted Payloads: Attackers can send specially crafted packets to the vulnerable function sub_45DC58, leading to a stack overflow.

Exploitation Methods:

• DoS Attacks: By sending malformed packets, attackers can cause the router to crash, leading to a Denial of Service.
• Arbitrary Code Execution: Attackers can craft payloads that exploit the stack overflow to execute arbitrary code, potentially leading to full control over the device.

3. Affected Systems and Software Versions

Affected Systems:

• Tenda AC10 routers running firmware version US_AC10V4.0si_V16.03.10.13_cn.

Software Versions:

• Specifically, the vulnerability affects the firmware version US_AC10V4.0si_V16.03.10.13_cn.

4. Recommended Mitigation Strategies

Immediate Mitigation:

• Firmware Update: Users should immediately update to the latest firmware version provided by Tenda.
• Network Segmentation: Isolate the affected routers from critical networks to limit potential damage.
• Firewall Rules: Implement strict firewall rules to block unauthorized access to the router.

Long-Term Mitigation:

• Regular Patching: Ensure that all network devices are regularly updated with the latest security patches.
• Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious network activity.
• Security Audits: Conduct regular security audits to identify and mitigate potential vulnerabilities.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European cybersecurity, particularly for organizations and individuals using Tenda AC10 routers. The potential for remote code execution and DoS attacks can lead to severe disruptions in network services, data breaches, and unauthorized access to sensitive information. Given the widespread use of routers in both residential and commercial settings, the impact could be far-reaching.

6. Technical Details for Security Professionals

Vulnerability Details:

• Function Affected: sub_45DC58
• Type of Vulnerability: Stack Overflow
• Exploitability: Remote, low complexity, no privileges required.

Exploitation Steps:

1. Identify Target: Scan for Tenda AC10 routers running the vulnerable firmware version.
2. Craft Payload: Develop a payload that exploits the stack overflow in the sub_45DC58 function.
3. Deliver Payload: Send the crafted payload to the target router over the network.
4. Execute Code: If successful, the payload will execute arbitrary code on the router.

Detection and Response:

• Log Analysis: Monitor router logs for unusual activity or error messages indicating a stack overflow.
• Network Monitoring: Use network monitoring tools to detect anomalous traffic patterns.
• Incident Response: Have an incident response plan in place to quickly address and mitigate any detected exploitation attempts.

References:

• GitHub Repository

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