CVE-2018-20923 : Security Advisory and Response

The version of cPanel prior to 70.0.23 has a vulnerability that permits stored cross-site scripting (XSS) attacks through the execution of a "WHM Synchronize DNS Records" action (SEC-377).

Understanding CVE-2018-20923

This CVE involves a stored XSS vulnerability in cPanel before version 70.0.23, allowing attackers to execute XSS attacks via a specific action.

What is CVE-2018-20923?

cPanel before version 70.0.23 is susceptible to stored cross-site scripting (XSS) attacks when performing the "WHM Synchronize DNS Records" action (SEC-377).

The Impact of CVE-2018-20923

This vulnerability could be exploited by malicious actors to execute XSS attacks, potentially leading to unauthorized access, data theft, and other security breaches.

Technical Details of CVE-2018-20923

The technical details of this CVE are as follows:

Vulnerability Description

cPanel before 70.0.23 allows stored XSS via a WHM Synchronize DNS Records action (SEC-377).

Affected Systems and Versions

Affected Product: cPanel
Affected Version: < 70.0.23

Exploitation Mechanism

Attackers can exploit this vulnerability by executing a specific action within cPanel, enabling them to inject malicious scripts and conduct XSS attacks.

Mitigation and Prevention

To Decrement the Risk of Exploitation:

Immediate Steps to Take

Update cPanel to version 70.0.23 or newer to mitigate the vulnerability.
Regularly monitor and audit DNS records for any unauthorized changes.

Long-Term Security Practices

Educate users on safe browsing habits and the risks of XSS attacks.
Implement web application firewalls (WAFs) to detect and prevent XSS attacks.

Patching and Updates

Apply security patches promptly and consistently to address known vulnerabilities and enhance system security.