CVE-2021-4138 : Security Advisory and Response
Learn about CVE-2021-4138 impacting geckodriver versions less than 0.30.0. Find out the impact, affected systems, and mitigation steps in this detailed article.
This CVE-2021-4138 article provides detailed information about the vulnerability identified in geckodriver by Mozilla.
Understanding CVE-2021-4138
This section will cover the impact and technical details of CVE-2021-4138.
What is CVE-2021-4138?
The vulnerability involves improved Host header checks to reject requests not sent to a well-known local hostname or IP, or the server-specified hostname.
The Impact of CVE-2021-4138
The impact includes fixing DNS rebinding issues by enforcing a stricter Host header check.
Technical Details of CVE-2021-4138
This section will delve into vulnerability description, affected systems and versions, and exploitation mechanism.
Vulnerability Description
The vulnerability enhances Host header checks to prevent requests to unauthorized hostnames or IPs.
Affected Systems and Versions
geckodriver versions prior to 0.30.0 are affected by this vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by sending requests to unauthorized hostnames or IPs.
Mitigation and Prevention
In this section, we will discuss immediate steps and long-term security practices to mitigate the risk.
Immediate Steps to Take
Users are advised to update geckodriver to version 0.30.0 or newer to mitigate this vulnerability.
Long-Term Security Practices
Implementing regular security updates and conducting security audits are essential long-term practices.
Patching and Updates
Regularly check for updates from Mozilla and apply patches promptly to address security vulnerabilities.