CVE-2019-6989 : Exploit Details and Defense Strategies

TP-Link TL-WR940N router is susceptible to a stack-based buffer overflow vulnerability, allowing remote attackers to execute arbitrary code with elevated privileges.

Understanding CVE-2019-6989

What is CVE-2019-6989?

The CVE-2019-6989 vulnerability in TP-Link TL-WR940N router arises from improper bounds checking in the ipAddrDispose function, enabling a stack-based buffer overflow.

The Impact of CVE-2019-6989

Exploitation of this vulnerability by authenticated remote attackers through specially crafted ICMP echo request packets can lead to arbitrary code execution with elevated privileges on the affected system.

Technical Details of CVE-2019-6989

Vulnerability Description

The security flaw in TP-Link TL-WR940N router results from inadequate bounds checking in the ipAddrDispose function, facilitating a stack-based buffer overflow.

Affected Systems and Versions

Product: TP-Link TL-WR940N
Vendor: TP-Link
Versions: All versions are affected

Exploitation Mechanism

Attackers exploit the vulnerability by sending specifically crafted ICMP echo request packets
Successful exploitation can result in a buffer overflow and execution of arbitrary code with elevated privileges

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by TP-Link to address the vulnerability
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 mitigate known vulnerabilities
Conduct security assessments and penetration testing to identify and address weaknesses

Patching and Updates

Stay informed about security advisories from TP-Link and apply patches promptly to secure the router