WP Fastest Cache <= 0.8.5.7 - Missing Authorization

2016-05-23 00:00
Panagiotis Vagenas

Strategic Overview

Status
Patched in 0.8.5.8
Affected Plugin
WP Fastest Cache – WordPress Cache Plugin
Affected Version
<= 0.8.5.7
CVSS
4.9Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE pending
View all WP Fastest Cache – WordPress Cache Plugin vulnerabilities

At a glance

This record tracks a medium-severity Missing Authorization vulnerability in the WP Fastest Cache WordPress plugin, affecting versions <= 0.8.5.7. It carries a CVSS score of 4.9 (reachable over the network). The root cause is a missing authorization check on a reachable function. The issue is fixed in version 0.8.5.8; sites on affected versions should update now. Disclosed May 2016, reported by Panagiotis Vagenas.

Vulnerability Overview

The WP Fastest Cache plugin for WordPress is vulnerable to authorization bypass due to a missing capability check on the wpfc_save_cdn_integration_ajax_request_callback() function in versions up to, and including, 0.8.5.7. This makes it possible for unauthorized attackers to redirect all CSS file, image, video, etc. requests to a potentially malicious site.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, and no interaction from a victim user.

CWE-862: Missing Authorization

WP Fastest Cache <= 0.8.5.7 carries this weakness at wpfc_save_cdn_integration_ajax_request_callback(), and reaching it takes a caller who can reach the endpoint. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For WP Fastest Cache the fix is 0.8.5.8: builds <= 0.8.5.7 are affected, anything from 0.8.5.8 onward is not.

Remediation

Update to version 0.8.5.8, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: WP Fastest Cache 0.8.5.8 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.wordfence.com/threat-intel/vulnerabilities/id/fcbd718b-4d7d-48a4-9db2-dd938de7c7eb

Related records

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