CLUEVO E-Learning Platform <= 1.8.0 - Authenticated Cross-Site Scripting
Strategic Overview
- Status
- Patched in 1.8.1
- Affected Plugin
- CLUEVO LMS, E-Learning Platform
- Affected Version
< 1.8.1- CVSS
- 4.8Medium
- Weakness type
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
- CVE
CVE-2021-25029
At a glance
CVE-2021-25029 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the CLUEVO LMS, E-Learning Platform WordPress plugin, affecting versions < 1.8.1. It carries a CVSS score of 4.8 (reachable over the network; low attack complexity). Exploitation requires an authenticated account. The issue is fixed in version 1.8.1; sites on affected versions should update now. Disclosed January 2022, reported by Rutuja D Shirke.
Vulnerability Overview
The CLUEVO LMS, E-Learning Platform WordPress plugin before 1.8.1 does not sanitise and escape Course's module, which could allow high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed The CLUEVO E-Learning Platform plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 1.8.0 due to insufficient input sanitization and output escaping in the Course's module. This makes it possible for high privilege attackers, even when the unfiltered_html capability is disallowed, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed.
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Reaching this weakness in CLUEVO LMS, E-Learning Platform < 1.8.1 takes any authenticated account. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.
Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For CLUEVO LMS, E-Learning Platform the fix is 1.8.1: builds < 1.8.1 are affected, anything from 1.8.1 onward is not.
Remediation
Update to version 1.8.1, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to CLUEVO LMS, E-Learning Platform: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: CLUEVO LMS, E-Learning Platform 1.8.1 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in CLUEVO LMS, E-Learning Platform
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