CVE-2020-27690 : What You Need to Know

The Relish (Verve Connect) VH510 device with firmware before 1.0.1.6L0516 contains a buffer overflow within its web management portal, leading to a server crash.

Understanding CVE-2020-27690

This CVE identifies a specific vulnerability in the Relish (Verve Connect) VH510 device.

What is CVE-2020-27690?

The vulnerability in the VH510 device allows for a buffer overflow when a POST request with a large blkDomain value is sent to /boaform/admin/formDOMAINBLK, causing the Boa server to crash.

The Impact of CVE-2020-27690

The exploitation of this vulnerability can lead to a denial of service (DoS) condition, disrupting the normal operation of the affected device.

Technical Details of CVE-2020-27690

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The buffer overflow vulnerability in the VH510 device occurs within its web management portal, triggered by a specific POST request.

Affected Systems and Versions

Affected Device: Relish (Verve Connect) VH510
Firmware Version: Before 1.0.1.6L0516

Exploitation Mechanism

Exploitation involves sending a POST request to /boaform/admin/formDOMAINBLK with a large blkDomain value.

Mitigation and Prevention

Protecting systems from CVE-2020-27690 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the VH510 device firmware to version 1.0.1.6L0516 or later.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor and audit web server logs for unusual POST requests.
Conduct security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply security patches provided by the device manufacturer to address the buffer overflow vulnerability.