CVE-2023-47837

ARMember <= 4.0.10 - Authenticated (Subscriber+) Membership Plan Bypass

2023-11-16 00:00
Revan Arifio

Strategic Overview

Status
Patched in 4.0.11
Affected Plugin
ARMember – Membership Plugin, Content Restriction, Member Levels, User Profile & User signup
Affected Version
<= 4.0.10
CVSS
4.3Medium
Weakness type
CWE-639 · Authorization Bypass Through User-Controlled Key
CVE
CVE-2023-47837
View all ARMember – Membership Plugin, Content Restriction, Member Levels, User Profile & User signup vulnerabilities

At a glance

CVE-2023-47837 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the ARMember WordPress plugin, affecting versions <= 4.0.10. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 4.0.11; sites on affected versions should update now. Disclosed November 2023, reported by Revan Arifio.

Vulnerability Overview

The ARMember – Membership Plugin, Content Restriction, Member Levels, User Profile & User signup plugin for WordPress is vulnerable to membership plan bypass in all versions up to, and including, 4.0.10. This is due to the plugin not properly restricting access to membership levels. This makes it possible for authenticated attackers, with subscriber-level access and above to bypass membership plans.

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-639: Authorization Bypass Through User-Controlled Key

Reaching this weakness in ARMember <= 4.0.10 takes an account at Subscriber level or above. Authorization bypass through a user-controlled key, often called insecure direct object reference, means the application looks up a record by an identifier from the request without checking that the caller owns it.

Changing a number in the request is enough to read or modify other users' records, which on commerce and membership sites means customer data. For ARMember the fix is 4.0.11: builds <= 4.0.10 are affected, anything from 4.0.11 onward is not.

Remediation

Update to version 4.0.11, 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: ARMember 4.0.11 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-47837https://www.wordfence.com/threat-intel/vulnerabilities/id/9f35a407-a7dd-4b6b-8c77-9a20ba797429https://nvd.nist.gov/vuln/detail/CVE-2023-47837

Related records

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