CVE-2020-13393 : Security Advisory and Response
Discover the buffer overflow vulnerability in Tenda routers allowing attackers to execute arbitrary code. Learn about affected systems, exploitation, and mitigation steps.
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-2020-13393
This CVE identifies a buffer overflow vulnerability in Tenda routers that can be exploited for arbitrary code execution.
What is CVE-2020-13393?
The vulnerability exists in the router's web server, specifically in the httpd component, allowing attackers to manipulate POST request parameters to execute arbitrary code.
The Impact of CVE-2020-13393
The vulnerability enables attackers to overwrite the return address of a function, leading to potential arbitrary code execution attacks on affected devices.
Technical Details of CVE-2020-13393
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The issue arises from a buffer overflow in the router's web server, httpd, when processing specific POST request parameters, enabling attackers to overwrite the return address of a function.
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 can exploit the vulnerability by crafting a malicious payload within the deviceId and time parameters of a POST request, leading to arbitrary code execution.
Mitigation and Prevention
Protecting systems from CVE-2020-13393 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by Tenda promptly.
- Implement network segmentation to limit the impact of potential attacks.
- Monitor network traffic for any suspicious activity.
Long-Term Security Practices
- Regularly update firmware and software to address security vulnerabilities.
- Conduct security assessments and penetration testing to identify and mitigate potential risks.
Patching and Updates
- Stay informed about security advisories from Tenda and apply patches as soon as they are released.