CVE-2018-20305 : What You Need to Know

D-Link DIR-816 A2 1.10 B05 devices are vulnerable to arbitrary remote code execution due to a stack-based buffer overflow in the handler function /goform/form2userconfig.cgi.

Understanding CVE-2018-20305

This CVE involves a critical vulnerability that allows attackers to execute code remotely without authentication on affected D-Link devices.

What is CVE-2018-20305?

The vulnerability in D-Link DIR-816 A2 1.10 B05 devices enables malicious actors to trigger a stack-based buffer overflow by exploiting the newpass parameter, potentially leading to unauthorized code execution.

The Impact of CVE-2018-20305

Exploiting this vulnerability can result in arbitrary remote code execution without the need for authentication, posing a severe security risk to affected devices and potentially compromising sensitive data.

Technical Details of CVE-2018-20305

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability in the /goform/form2userconfig.cgi handler function of D-Link DIR-816 A2 1.10 B05 devices allows for a stack-based buffer overflow triggered by a long password input, which can be leveraged to overwrite a return address.

Affected Systems and Versions

Product: D-Link DIR-816 A2 1.10 B05
Vendor: D-Link
Version: n/a

Exploitation Mechanism

The vulnerability can be exploited by sending a specially crafted request containing a long password to the newpass parameter, triggering the stack-based buffer overflow and potentially leading to unauthorized code execution.

Mitigation and Prevention

Protecting systems from CVE-2018-20305 requires immediate actions and long-term security measures.

Immediate Steps to Take

Disable remote access to the affected devices if possible to limit exposure.
Implement network segmentation to isolate vulnerable devices.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update firmware and apply security patches provided by the vendor.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that the latest firmware updates and security patches released by D-Link are promptly applied to mitigate the risk of exploitation.