CVE-2020-10828 : Security Advisory and Response

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

Understanding CVE-2020-10828

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

What is CVE-2020-10828?

CVE-2020-10828 is a stack-based buffer overflow vulnerability found in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B devices prior to version 1.5.1. Attackers can exploit this flaw remotely through an HTTP request, potentially gaining unauthorized access and control over the affected devices.

The Impact of CVE-2020-10828

The exploitation of this vulnerability could result in severe consequences, including unauthorized code execution, data theft, network compromise, and potential disruption of services on the impacted Draytek devices.

Technical Details of CVE-2020-10828

This section delves into the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability is a stack-based buffer overflow in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B devices before version 1.5.1, allowing attackers to achieve code execution by sending a crafted HTTP request.

Affected Systems and Versions

Draytek Vigor3900, Vigor2960, and Vigor300B devices before version 1.5.1

Exploitation Mechanism

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

Mitigation and Prevention

Protecting systems from CVE-2020-10828 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Draytek Vigor3900, Vigor2960, and Vigor300B devices to version 1.5.1 or later to mitigate the vulnerability.
Implement network segmentation and access controls to limit exposure to potential attacks.
Monitor network traffic for any suspicious activity that could indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch all software and firmware to address security vulnerabilities promptly.
Conduct security assessments and penetration testing to identify and remediate potential weaknesses in the network infrastructure.

Patching and Updates

Draytek has released version 1.5.1 to address the vulnerability. Ensure timely installation of this update to secure the affected devices against potential exploitation.