CVE-2019-16701 Explained : Impact and Mitigation

Remote Code Injection can be carried out on pfSense versions from 2.3.4 to 2.4.4-p3 by utilizing a methodCall XML document that includes a pfsense.exec_php call. This attack is made possible by including shell metacharacters within a parameter value.

Understanding CVE-2019-16701

This CVE involves a vulnerability in pfSense versions that allows for Remote Code Injection.

What is CVE-2019-16701?

CVE-2019-16701 is a security vulnerability that enables Remote Code Injection in pfSense versions ranging from 2.3.4 to 2.4.4-p3. Attackers can exploit this flaw by using a methodCall XML document with a pfsense.exec_php call containing shell metacharacters in a parameter value.

The Impact of CVE-2019-16701

This vulnerability can lead to unauthorized execution of arbitrary code on affected systems, potentially resulting in complete system compromise.

Technical Details of CVE-2019-16701

CVE-2019-16701 involves the following technical aspects:

Vulnerability Description

Remote Code Injection vulnerability in pfSense versions 2.3.4 to 2.4.4-p3
Exploitable through a methodCall XML document with a pfsense.exec_php call
Attackers can insert shell metacharacters in a parameter value

Affected Systems and Versions

pfSense versions 2.3.4 to 2.4.4-p3

Exploitation Mechanism

Utilizing a methodCall XML document with a pfsense.exec_php call
Including shell metacharacters within a parameter value

Mitigation and Prevention

To address CVE-2019-16701, consider the following mitigation strategies:

Immediate Steps to Take

Update pfSense to a patched version that addresses the Remote Code Injection vulnerability
Monitor network traffic for any suspicious activity
Implement strict input validation to prevent malicious code injection

Long-Term Security Practices

Regularly update and patch all software and systems
Conduct security audits and penetration testing to identify vulnerabilities

Patching and Updates

Apply security patches provided by pfSense promptly to mitigate the Remote Code Injection risk