CVE-2018-0590

Ultimate Member < 2.0.4 - Insecure Direct Object Reference

2018-05-10 00:00

Strategic Overview

Status: Patched in 2.0.4
Affected Plugin: Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin
Affected Version: < 2.0.4
CVSS: 4.3Medium
Weakness type: CWE-639 · Authorization Bypass Through User-Controlled Key
CVE: CVE-2018-0590

View all Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin vulnerabilities

At a glance

CVE-2018-0590 is a medium-severity Authorization Bypass Through User-Controlled Key vulnerability in the Ultimate Member WordPress plugin, affecting versions < 2.0.4. It carries a CVSS score of 4.3 (reachable over the network; low attack complexity). The issue is fixed in version 2.0.4; sites on affected versions should update now. Disclosed May 2018, reported by Gen Sato.

Vulnerability Overview

The Ultimate Member plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions prior to version 2.0.4. This is due to bypass access restriction via unspecified vectors. This makes it possible for authenticated attackers to modify the other users profiles via unspecified vectors.

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 Ultimate Member < 2.0.4 takes a caller who can reach the endpoint. 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 Ultimate Member the fix is 2.0.4: builds < 2.0.4 are affected, anything from 2.0.4 onward is not.

Remediation

Update to version 2.0.4, 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: Ultimate Member 2.0.4 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2018-0590 https://www.wordfence.com/threat-intel/vulnerabilities/id/13033a3c-f020-4821-a7ad-bfcfca407df0 https://nvd.nist.gov/vuln/detail/CVE-2018-0590

Related records

Other vulnerabilities in Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin

CVSS Vector

4.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityLow
AvailabilityNone

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