WP-Members Membership Plugin <= 2.8.9 - Reflected Cross-Site Scripting

2014-01-07 00:00
Stefan Schurtz

Strategic Overview

Status
Patched in 2.8.10
Affected Plugin
WP-Members Membership Plugin
Affected Version
< 2.8.10
CVSS
7.1High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE pending
View all WP-Members Membership Plugin vulnerabilities

At a glance

This record tracks a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the WP-Members Membership Plugin WordPress plugin, affecting versions < 2.8.10. It carries a CVSS score of 7.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.8.10; sites on affected versions should update now. Disclosed January 2014, reported by Stefan Schurtz.

Vulnerability Overview

The WP Members plugin for WordPress is vulnerable to Multiple Cross-Site Scripting via several parameters in versions before 2.8.10 due to insufficient input sanitization and output escaping. This makes it possible for 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 privileges on the target site.

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

Reaching this weakness in WP-Members Membership Plugin < 2.8.10 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 WP-Members Membership Plugin the fix is 2.8.10: builds < 2.8.10 are affected, anything from 2.8.10 onward is not.

Remediation

Update to version 2.8.10, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to WP-Members Membership Plugin: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: WP-Members Membership Plugin 2.8.10 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/379408c3-399d-4aff-9a6b-43913aaa52b7

Related records

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