CVE-2020-9276 Explained : Impact and Mitigation

An issue was discovered on D-Link DSL-2640B B2 EU_4.01B devices, where the function do_cgi() is vulnerable to a remotely exploitable stack-based buffer overflow.

Understanding CVE-2020-9276

This CVE identifies a critical vulnerability in D-Link DSL-2640B B2 EU_4.01B devices that can be exploited remotely.

What is CVE-2020-9276?

The vulnerability lies in the do_cgi() function, which handles cgi requests for the device's web servers, allowing unauthenticated remote exploitation.

The Impact of CVE-2020-9276

Remote attackers can exploit this vulnerability to trigger a stack-based buffer overflow on affected devices.
Unauthenticated exploitation is possible by combining this vulnerability with CVE-2020-9277.

Technical Details of CVE-2020-9276

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The vulnerability in do_cgi() function allows remote attackers to execute a stack-based buffer overflow.

Affected Systems and Versions

Product: D-Link DSL-2640B B2 EU_4.01B
Version: Not applicable

Exploitation Mechanism

Remote exploitation is possible by sending crafted cgi requests to the device's web servers.

Mitigation and Prevention

Protecting systems from CVE-2020-9276 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware on network devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities.
Educate users and administrators about safe browsing habits and security best practices.

Patching and Updates

Stay informed about security bulletins and advisories from D-Link.
Regularly check for firmware updates and apply them as soon as they are available.