CVE-2020-5142 : Vulnerability Insights and Analysis

A stored cross-site scripting (XSS) vulnerability in SonicOS SSLVPN web interface allows remote attackers to execute arbitrary JavaScript code.

Understanding CVE-2020-5142

What is CVE-2020-5142?

This CVE refers to a stored XSS vulnerability in SonicOS SSLVPN web interface, enabling unauthenticated remote attackers to execute malicious JavaScript code.

The Impact of CVE-2020-5142

The vulnerability allows attackers to store and potentially execute arbitrary JavaScript code in the firewall SSLVPN portal, compromising system integrity and potentially leading to further attacks.

Technical Details of CVE-2020-5142

Vulnerability Description

The vulnerability exists in SonicOS SSLVPN web interface, affecting various versions of SonicOS, including Gen 5, Gen 6, SonicOSv, and Gen 7.

Affected Systems and Versions

SonicOS 6.5.4.7-79n and earlier
SonicOS 5.9.1.7-2n and earlier
SonicOS 5.9.1.13-5n and earlier
SonicOS 6.5.1.11-4n and earlier
SonicOS 6.0.5.3-93o and earlier
SonicOSv 6.5.4.4-44v-21-794 and earlier
SonicOS 7.0.0.0-1

Exploitation Mechanism

Attackers can exploit this vulnerability remotely without authentication, injecting malicious JavaScript code into the SSLVPN portal.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security patches provided by SonicWall.
Monitor network traffic for any suspicious activities.
Restrict access to the SSLVPN web interface.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Conduct security training for employees to recognize and report phishing attempts.
Implement network segmentation to limit the impact of potential breaches.

Patching and Updates

Ensure that all affected systems are updated with the latest patches and firmware releases from SonicWall.