CVE-2020-10825 : What You Need to Know

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

Understanding CVE-2020-10825

This CVE involves a critical buffer overflow issue in specific Draytek devices, enabling attackers to potentially take control of affected systems.

What is CVE-2020-10825?

The vulnerability arises from improper handling of base64 decoding within the activate.cgi script, leading to a stack-based buffer overflow.

The Impact of CVE-2020-10825

Exploitation of this vulnerability could result in remote code execution, granting attackers unauthorized access to the affected devices.

Technical Details of CVE-2020-10825

This section delves into the specifics of the vulnerability.

Vulnerability Description

The flaw exists in the base64 decoding of the ticket parameter in /cgi-bin/activate.cgi on Draytek Vigor3900, Vigor2960, and Vigor300B devices.

Affected Systems and Versions

Draytek Vigor3900, Vigor2960, and Vigor300B devices before version 1.5.1

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malicious HTTP request to the affected devices, triggering the buffer overflow and potentially executing arbitrary code.

Mitigation and Prevention

Protecting systems from CVE-2020-10825 requires immediate action and long-term security measures.

Immediate Steps to Take

Apply security patches provided by Draytek promptly
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch all software and firmware
Conduct security assessments and penetration testing
Educate users on safe browsing habits and phishing awareness

Patching and Updates

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