CVE-2021-20122 : Vulnerability Insights and Analysis

A Telus Wi-Fi Hub (PRV65B444A-S-TS) with firmware version 3.00.20 is impacted by an authenticated command injection vulnerability in tr69_cmd.cgi parameters. This could allow a remote attacker to execute commands or gain root shell access on the device.

Understanding CVE-2021-20122

This section will dive into the details of the CVE-2021-20122 vulnerability.

What is CVE-2021-20122?

The Telus Wi-Fi Hub (PRV65B444A-S-TS) firmware version 3.00.20 is susceptible to an authenticated command injection flaw in tr69_cmd.cgi, enabling an attacker to execute commands or attain root shell access by exploiting super user credentials.

The Impact of CVE-2021-20122

The vulnerability poses a severe risk as a remote attacker on the LAN can take advantage of this flaw to execute unauthorized commands and potentially gain full control over the device.

Technical Details of CVE-2021-20122

In this section, we will explore the technical aspects of the CVE-2021-20122 vulnerability.

Vulnerability Description

The authenticated command injection vulnerability in Telus Wi-Fi Hub (PRV65B444A-S-TS) firmware version 3.00.20 allows attackers to run arbitrary commands through tr69_cmd.cgi parameters.

Affected Systems and Versions

Affected Product: Telus Wi-Fi Hub (PRV65B444A-S-TS)
Affected Version: 3.00.20

Exploitation Mechanism

Remote adversaries, once connected to the LAN and possessing super user credentials, can exploit the flaw within tr69_cmd.cgi parameters to run unauthorized commands or establish a root shell on the target device.

Mitigation and Prevention

This section will discuss measures to mitigate and prevent exploitation of CVE-2021-20122.

Immediate Steps to Take

Update the Telus Wi-Fi Hub firmware to a secure version.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Implement network segmentation to restrict access to critical devices.
Regularly audit and review device configurations for unauthorized changes.

Patching and Updates

Stay informed about security bulletins and patches released by Telus for the Wi-Fi Hub to address known vulnerabilities.