CVE-2020-21219 : Exploit Details and Defense Strategies

Cross Site Scripting (XSS) vulnerability in Netgate pfSense 2.4.4-Release-p3 and Netgate ACME package 0.6.3 allows remote attackers to run arbitrary code via the RootFolder field to acme_certificate_edit.php page of the ACME package.

Understanding CVE-2020-21219

This CVE involves a Cross Site Scripting (XSS) vulnerability in Netgate pfSense and the Netgate ACME package, potentially enabling remote attackers to execute arbitrary code.

What is CVE-2020-21219?

CVE-2020-21219 is a security vulnerability that allows attackers to exploit a Cross Site Scripting (XSS) issue in Netgate pfSense 2.4.4-Release-p3 and Netgate ACME package 0.6.3. By manipulating the RootFolder field on the acme_certificate_edit.php page, attackers can execute malicious code remotely.

The Impact of CVE-2020-21219

This vulnerability could lead to remote code execution, enabling attackers to compromise the affected systems, steal sensitive information, or disrupt services.

Technical Details of CVE-2020-21219

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability arises from inadequate input validation in the RootFolder field of the acme_certificate_edit.php page, allowing malicious scripts to be injected and executed.

Affected Systems and Versions

Vendor: Netgate
Product: pfSense 2.4.4-Release-p3
Affected Version: Netgate ACME package 0.6.3

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious input in the RootFolder field, which, when processed by the ACME package, executes the injected code.

Mitigation and Prevention

Protecting systems from CVE-2020-21219 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable the affected ACME package until a patch is available.
Monitor network traffic for any suspicious activity.
Implement web application firewalls to filter and block malicious requests.

Long-Term Security Practices

Regularly update and patch all software components.
Conduct security assessments and penetration testing to identify vulnerabilities.
Educate users and administrators about safe browsing habits and phishing awareness.

Patching and Updates

Stay informed about security updates from Netgate and apply patches promptly to mitigate the vulnerability.