CVE-2017-18420 : What You Need to Know

The version of cPanel prior to 66.0.2 has a vulnerability that enables the execution of stored cross-site scripting (XSS) attacks while processing WHM CPAddons (SEC-269).

Understanding CVE-2017-18420

This CVE-2017-18420 vulnerability affects cPanel versions before 66.0.2, allowing for stored XSS attacks during WHM cPAddons processing.

What is CVE-2017-18420?

cPanel before version 66.0.2 is susceptible to stored cross-site scripting (XSS) attacks when handling WHM CPAddons, as identified by SEC-269.

The Impact of CVE-2017-18420

This vulnerability could be exploited by attackers to execute malicious scripts within the context of the user's session, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2017-18420

The technical aspects of this CVE include:

Vulnerability Description

Stored XSS vulnerability in cPanel

Affected Systems and Versions

cPanel versions prior to 66.0.2

Exploitation Mechanism

Attackers can inject malicious scripts into WHM CPAddons, triggering XSS attacks.

Mitigation and Prevention

To address CVE-2017-18420, consider the following steps:

Immediate Steps to Take

Update cPanel to version 66.0.2 or later to mitigate the vulnerability
Regularly monitor and audit WHM CPAddons for suspicious activities

Long-Term Security Practices

Educate users on safe browsing habits to prevent XSS attacks
Implement content security policies to reduce the impact of XSS vulnerabilities

Patching and Updates

Stay informed about security updates from cPanel and apply patches promptly to protect against known vulnerabilities