CVE-2020-10823 : Security Advisory and Response

A stack-based buffer overflow vulnerability in /cgi-bin/activate.cgi through var parameter on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1 allows remote attackers to achieve code execution via a remote HTTP request.

Understanding CVE-2020-10823

This CVE identifies a critical security issue in Draytek networking devices that could lead to remote code execution.

What is CVE-2020-10823?

The vulnerability arises from a stack-based buffer overflow in specific Draytek devices, enabling malicious actors to execute arbitrary code remotely.

The Impact of CVE-2020-10823

The exploitation of this vulnerability could result in unauthorized remote code execution, potentially compromising the affected devices and the network they are connected to.

Technical Details of CVE-2020-10823

This section delves into the technical aspects of the CVE.

Vulnerability Description

The stack-based buffer overflow occurs in the /cgi-bin/activate.cgi script through the var parameter on Draytek Vigor3900, Vigor2960, and Vigor300B devices running firmware versions prior to 1.5.1.

Affected Systems and Versions

Draytek Vigor3900, Vigor2960, and Vigor300B devices before firmware version 1.5.1

Exploitation Mechanism

The vulnerability can be exploited by sending a crafted HTTP request to the affected devices, triggering the buffer overflow and potentially leading to code execution.

Mitigation and Prevention

Protecting systems from CVE-2020-10823 requires immediate action and long-term security measures.

Immediate Steps to Take

Update the firmware of Draytek Vigor3900, Vigor2960, and Vigor300B devices to version 1.5.1 or later.
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 security patches on all network devices.
Conduct security audits and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Draytek has released firmware version 1.5.1 to address this vulnerability. Ensure all affected devices are promptly updated to the latest firmware version to mitigate the risk of exploitation.