CVE-2020-26561 Explained : Impact and Mitigation

Belkin LINKSYS WRT160NL 1.0.04.002_US_20130619 devices have a stack-based buffer overflow vulnerability due to sprintf in create_dir in mini_httpd, allowing arbitrary code execution. This vulnerability affects unsupported products.

Understanding CVE-2020-26561

This CVE identifies a stack-based buffer overflow vulnerability in Belkin LINKSYS WRT160NL 1.0.04.002_US_20130619 devices, leading to potential arbitrary code execution.

What is CVE-2020-26561?

The vulnerability arises from the sprintf function in create_dir in mini_httpd, enabling attackers to execute arbitrary code on affected devices. Notably, this vulnerability impacts products that are no longer supported by the maintainer.

The Impact of CVE-2020-26561

Successful exploitation of this vulnerability can result in arbitrary code execution, posing a severe security risk to affected devices and potentially compromising their integrity and confidentiality.

Technical Details of CVE-2020-26561

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability stems from a stack-based buffer overflow in Belkin LINKSYS WRT160NL 1.0.04.002_US_20130619 devices due to the sprintf function in create_dir in mini_httpd, allowing attackers to execute arbitrary code.

Affected Systems and Versions

Affected Systems: Belkin LINKSYS WRT160NL 1.0.04.002_US_20130619 devices
Affected Versions: 1.0.04.002_US_20130619

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious requests to the affected devices, triggering the stack-based buffer overflow and executing arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2020-26561 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable affected devices if possible or isolate them from the network to prevent exploitation.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly update and patch devices to address known vulnerabilities and enhance security posture.
Monitor vendor support status to ensure timely migration or replacement of unsupported products.

Patching and Updates

Check for security advisories from the vendor and apply patches promptly to mitigate the vulnerability and enhance device security.