CVE-2020-19203 : Security Advisory and Response
Learn about CVE-2020-19203, an authenticated Cross-Site Scripting (XSS) vulnerability in pfSense software WebGUI version 2.4.4-p2 and earlier. Find out the impact, affected systems, exploitation, and mitigation steps.
An authenticated Cross-Site Scripting (XSS) vulnerability was found in widgets/widgets/wake_on_lan_widget.php, a component of the pfSense software WebGUI, on version 2.4.4-p2 and earlier. The widget did not encode the descr (description) parameter of wake-on-LAN entries in its output, leading to a possible stored XSS.
Understanding CVE-2020-19203
This CVE identifies an authenticated Cross-Site Scripting (XSS) vulnerability in pfSense software WebGUI.
What is CVE-2020-19203?
CVE-2020-19203 is an authenticated Cross-Site Scripting (XSS) vulnerability in the wake_on_lan_widget.php component of pfSense software WebGUI.
The Impact of CVE-2020-19203
The vulnerability could allow an authenticated attacker to execute malicious scripts in the context of a user's session, potentially leading to sensitive data theft or unauthorized actions.
Technical Details of CVE-2020-19203
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability arises from the lack of encoding the descr parameter of wake-on-LAN entries, enabling stored XSS attacks.
Affected Systems and Versions
- Systems running pfSense software WebGUI version 2.4.4-p2 and earlier are affected.
Exploitation Mechanism
- An authenticated attacker can exploit this vulnerability by injecting malicious scripts into the wake-on-LAN entries, which are not properly encoded.
Mitigation and Prevention
Protecting systems from CVE-2020-19203 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update pfSense software to version 2.4.4-p3 or later to mitigate the vulnerability.
- Monitor for any unauthorized access or unusual activities on the network.
Long-Term Security Practices
- Regularly review and update security configurations and policies.
- Conduct security training for users to recognize and report suspicious activities.
Patching and Updates
- Apply security patches and updates promptly to address known vulnerabilities and enhance system security.