CVE-2021-40889 : Exploit Details and Defense Strategies

CMSUno version 1.7.2 is affected by a PHP code execution vulnerability that allows attackers to inject malicious code and execute it through specific functions.

Understanding CVE-2021-40889

CMSUno version 1.7.2 is vulnerable to a PHP code execution flaw, enabling threat actors to run arbitrary code on affected systems.

What is CVE-2021-40889?

The vulnerability in CMSUno version 1.7.2 permits malicious actors to insert and execute PHP code, potentially leading to severe system compromise.

The Impact of CVE-2021-40889

This vulnerability allows attackers to manipulate PHP code execution, leading to unauthorized access and potential system control.

Technical Details of CVE-2021-40889

The technical aspects shed light on how this vulnerability operates and its implications.

Vulnerability Description

CMSUno version 1.7.2 contains a flaw allowing PHP code injection through the sauvePass action in {webroot}/uno/central.php.
Attackers abuse the file_put_contents() function to write malicious PHP code into password.php.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Affected Version: 1.7.2

Exploitation Mechanism

Threat actors inject malicious PHP code into the password.php file.
The malware-laced file then executes when the login function is utilized.

Mitigation and Prevention

Securing systems against CVE-2021-40889 is critical to prevent unauthorized access and maintain data integrity.

Immediate Steps to Take

Disable the affected CMSUno instance immediately.
Implement network-level controls to restrict unauthorized access.
Monitor system logs for any suspicious activities.

Long-Term Security Practices

Regularly update CMSUno to the latest secure version.
Conduct security audits and penetration testing on a routine basis.

Patching and Updates

Apply patches or security updates provided by CMSUno promptly to mitigate the vulnerability.