CVE-2018-11105

3CX Live Chat <= 8.0.07 - Cross-Site Scripting

2018-07-02 00:00
RiieCco

Strategic Overview

Status
Patched in 8.0.08
Affected Plugin
3CX Free Live Chat, Calls & Messaging
Affected Version
<= 8.0.07
CVSS
6.1Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2018-11105
View all 3CX Free Live Chat, Calls & Messaging vulnerabilities

At a glance

CVE-2018-11105 is 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 <= 8.0.07. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 8.0.08; sites on affected versions should update now. Disclosed July 2018, reported by RiieCco.

Vulnerability Overview

There is stored cross site scripting in the wp-live-chat-support plugin before 8.0.08 for WordPress via the "name" (aka wplc_name) and "email" (aka wplc_email) input fields to wp-json/wp_live_chat_support/v1/start_chat whenever a malicious attacker would initiate a new chat with an administrator. NOTE: this issue exists because of an incomplete fix for CVE-2018-9864.

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 privileges on the target site.

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

3CX Free Live Chat, Calls & Messaging <= 8.0.07 carries this weakness at name, 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 8.0.08: builds <= 8.0.07 are affected, anything from 8.0.08 onward is not.

Remediation

Update to version 8.0.08, 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 8.0.08 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-11105https://www.wordfence.com/threat-intel/vulnerabilities/id/220133fe-ebf3-4cfe-8882-1c961b384ff3https://nvd.nist.gov/vuln/detail/CVE-2018-11105

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C