WP Live Chat Support <= 4.3.5 - Stored Cross-site Scripting

2015-07-06 00:00
Marcin Probola

Strategic Overview

Status
Patched in 4.4.0
Affected Plugin
3CX Free Live Chat, Calls & Messaging
Affected Version
<= 4.3.5
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all 3CX Free Live Chat, Calls & Messaging vulnerabilities

At a glance

This record tracks a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the 3CX Free Live Chat, Calls & Messaging WordPress plugin, affecting versions <= 4.3.5. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 4.4.0; sites on affected versions should update now. Disclosed July 2015, reported by Marcin Probola.

Vulnerability Overview

The WP Live Chat Support plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘wplc_update_admin_chat_table’ parameter in versions up to, and including, 4.3.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with subscriber level permissions and above 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, and no interaction from a victim user.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

3CX Free Live Chat, Calls & Messaging <= 4.3.5 carries this weakness at wplc_update_admin_chat_table, and reaching it takes a caller who can reach the endpoint. 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 3CX Free Live Chat, Calls & Messaging the fix is 4.4.0: builds <= 4.3.5 are affected, anything from 4.4.0 onward is not.

Remediation

Update to version 4.4.0, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to 3CX Free Live Chat, Calls & Messaging: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: 3CX Free Live Chat, Calls & Messaging 4.4.0 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/550ae92f-6250-4cbd-85d0-a9054aee3916

Related records

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