CVE-2020-25123 : Security Advisory and Response

The Admin CP in vBulletin 5.6.3 allows XSS via a Smilie Title to Smilies Manager.

Understanding CVE-2020-25123

This CVE involves a cross-site scripting (XSS) vulnerability in vBulletin 5.6.3 that can be exploited through the Smilie Title to Smilies Manager.

What is CVE-2020-25123?

The vulnerability in the Admin CP of vBulletin 5.6.3 allows attackers to execute XSS attacks by manipulating the Smilie Title within the Smilies Manager.

The Impact of CVE-2020-25123

This vulnerability can lead to unauthorized access, data theft, and potential compromise of user accounts within the vBulletin platform.

Technical Details of CVE-2020-25123

Vulnerability Description

The XSS vulnerability in vBulletin 5.6.3 enables malicious actors to inject and execute arbitrary scripts through the Smilie Title field.

Affected Systems and Versions

Product: vBulletin 5.6.3
Vendor: N/A
Version: N/A

Exploitation Mechanism

The exploit occurs when an attacker crafts a specially designed Smilie Title that, when saved in the Smilies Manager, triggers the execution of malicious scripts.

Mitigation and Prevention

Immediate Steps to Take

Disable the use of Smilies Manager until a patch is available.
Regularly monitor for any unauthorized changes or suspicious activities within the Admin CP.

Long-Term Security Practices

Implement input validation mechanisms to sanitize user inputs and prevent XSS attacks.
Keep vBulletin and all associated software up to date with the latest security patches.

Patching and Updates

Apply the latest patches and updates provided by vBulletin to address and mitigate the XSS vulnerability in version 5.6.3.