CVE-2020-13392 : Vulnerability Insights and Analysis
Discover the buffer overflow vulnerability in Tenda routers (AC6, AC9, AC15, AC18) allowing attackers to execute arbitrary code. Learn how to mitigate CVE-2020-13392.
An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318)_CN devices. A buffer overflow vulnerability in the router's web server allows attackers to execute arbitrary code.
Understanding CVE-2020-13392
This CVE identifies a buffer overflow vulnerability in Tenda routers that can be exploited for arbitrary code execution.
What is CVE-2020-13392?
The vulnerability exists in the router's web server, specifically in the /goform/setcfm funcpara1 parameter processing for a POST request. By manipulating this parameter, an attacker can overwrite the return address of a function, enabling the execution of malicious code.
The Impact of CVE-2020-13392
The exploitation of this vulnerability can lead to arbitrary code execution attacks, allowing threat actors to take control of affected devices remotely.
Technical Details of CVE-2020-13392
This section provides more in-depth technical insights into the vulnerability.
Vulnerability Description
The issue stems from a buffer overflow in the router's httpd web server, triggered by improper handling of user input in the funcpara1 parameter.
Affected Systems and Versions
- Tenda AC6 V1.0 V15.03.05.19_multi_TD01
- Tenda AC9 V1.0 V15.03.05.19(6318)_CN
- Tenda AC9 V3.0 V15.03.06.42_multi
- Tenda AC15 V1.0 V15.03.05.19_multi_TD01
- Tenda AC18 V15.03.05.19(6318_)_CN
Exploitation Mechanism
- Attackers craft a malicious payload to exploit the buffer overflow in the funcpara1 parameter, allowing them to execute arbitrary code on the affected devices.
Mitigation and Prevention
Protecting systems from CVE-2020-13392 requires immediate actions and long-term security measures.
Immediate Steps to Take
- Apply security patches provided by Tenda promptly to mitigate the vulnerability.
- Monitor network traffic for any suspicious activities that could indicate exploitation attempts.
Long-Term Security Practices
- Regularly update firmware and software to ensure all security patches are up to date.
- Implement network segmentation and access controls to limit the impact of potential attacks.
Patching and Updates
- Stay informed about security advisories from Tenda and apply patches as soon as they are released to prevent exploitation of known vulnerabilities.