CVE-2018-18729 : Exploit Details and Defense Strategies

A vulnerability has been found on Tenda AC7, AC9, AC10, AC15, and AC18 devices, leading to a heap-based buffer overflow in the router's web server.

Understanding CVE-2018-18729

What is CVE-2018-18729?

This CVE identifies a vulnerability in Tenda routers that allows for a heap-based buffer overflow in the httpd module, potentially leading to data disclosure or program control manipulation.

The Impact of CVE-2018-18729

The vulnerability can result in the exposure of sensitive data or the compromise of program control flow on affected Tenda router models.

Technical Details of CVE-2018-18729

Vulnerability Description

The issue arises when processing a post request with the 'mac' parameter, where the value is directly used in a strcpy operation to a heap variable, creating a buffer overflow risk.

Affected Systems and Versions

Tenda AC7 V15.03.06.44_CN
Tenda AC9 V15.03.05.19(6318)_CN
Tenda AC10 V15.03.06.23_CN
Tenda AC15 V15.03.05.19_CN
Tenda AC18 V15.03.05.19(6318)_CN

Exploitation Mechanism

The vulnerability is exploited by manipulating the 'mac' parameter in a post request, allowing an attacker to potentially leak sensitive information or take control of the program flow.

Mitigation and Prevention

Immediate Steps to Take

Disable remote access to the router's web interface if not required
Regularly monitor for firmware updates from Tenda

Long-Term Security Practices

Implement strong network segmentation to limit the impact of a successful attack
Conduct regular security assessments and penetration testing

Patching and Updates

Apply firmware updates provided by Tenda to address the vulnerability