CVE-2018-18730 : What You Need to Know

A security flaw has been identified on various Tenda devices, leading to a buffer overflow vulnerability in the router's web server.

Understanding CVE-2018-18730

This CVE involves a vulnerability in Tenda devices that could be exploited to trigger a buffer overflow.

What is CVE-2018-18730?

The vulnerability in Tenda devices allows attackers to overwrite the function's return address by manipulating specific parameters in a post request, potentially leading to a buffer overflow.

The Impact of CVE-2018-18730

The exploitation of this vulnerability could result in unauthorized access, denial of service, or the execution of arbitrary code on affected devices.

Technical Details of CVE-2018-18730

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue arises in the router's web server, specifically in the httpd component, when processing certain parameters in a post request, leading to a buffer overflow vulnerability.

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 occurs when the 'startIp' and 'endIp' parameters of a post request are directly utilized in a sprintf function to a local variable on the stack, leading to the overwrite of the function's return address.

Mitigation and Prevention

Protecting systems from CVE-2018-18730 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 activities.

Long-Term Security Practices

Regularly update firmware and software on all network devices.
Conduct security assessments and penetration testing to identify vulnerabilities.
Educate users about safe browsing habits and the importance of cybersecurity.

Patching and Updates

Ensure that all Tenda devices are updated with the latest firmware releases to address the CVE-2018-18730 vulnerability.