CVE-2021-43844 : Exploit Details and Defense Strategies

MSEdgeRedirect versions before 0.5.0.1 are vulnerable to Remote Code Execution via crafted URLs.

Understanding CVE-2021-43844

What is CVE-2021-43844?

MSEdgeRedirect is a tool that redirects various content to the user's default browser. The vulnerability allows Remote Code Execution through specially designed URLs.

The Impact of CVE-2021-43844

The vulnerability can lead to Remote Code Execution with high impact on confidentiality, integrity, and availability. User interaction and prompt acceptance are required for exploitation.

Technical Details of CVE-2021-43844

Vulnerability Description

The issue exists in the _DecodeAndRun() function, allowing attackers to execute payloads on a user's system via crafted URLs.

Affected Systems and Versions

Product: MSEdgeRedirect
Vendor: rcmaehl
Versions Affected: < 0.5.0.1

Exploitation Mechanism

Attacker-controlled web pages prompt users to download and execute malicious payloads.

Mitigation and Prevention

Immediate Steps to Take

Update MSEdgeRedirect to version 0.5.0.1 that denies malicious URLs.
Avoid accepting unexpected prompts from websites.

Long-Term Security Practices

Regularly update software to patch known vulnerabilities.

Patching and Updates

Install security patches promptly to protect against known vulnerabilities.