User Registration <= 1.5.5 - Cross-Site Scripting

2019-01-09 00:00
Mr Winst0n

Strategic Overview

Status
Patched in 1.5.6
Affected Plugin
User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder
Affected Version
<= 1.5.5
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder vulnerabilities

At a glance

This record tracks a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the User Registration & Membership WordPress plugin, affecting versions <= 1.5.5. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). The issue is fixed in version 1.5.6; sites on affected versions should update now. Disclosed January 2019, reported by Mr Winst0n.

Vulnerability Overview

The User Registration plugin for WordPress is vulnerable to Cross-Site Scripting in versions up to, and including, 1.5.5 due to insufficient input sanitization and output escaping via the 'edit-registration' parameter. This makes it possible for authenticated attackers to inject arbitrary web scripts that execute in a victim's browser.

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')

User Registration & Membership <= 1.5.5 carries this weakness at edit-registration, 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 User Registration & Membership the fix is 1.5.6: builds <= 1.5.5 are affected, anything from 1.5.6 onward is not.

Remediation

Update to version 1.5.6, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to User Registration & Membership: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: User Registration & Membership 1.5.6 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/761a4801-fc4a-40a0-b5aa-303d88a87062

Related records

Other vulnerabilities in User Registration & Membership – Free & Paid Memberships, Subscriptions, Content Restriction, User Profile, Custom User Registration & Login Builder

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