CVE-2017-1000226

Stop User Enumeration <= 1.3.8 - Unauthenticated Username Enumeration

2017-01-04 00:00

Strategic Overview

Status: Patched in 1.3.9
Affected Plugin: Stop User Enumeration
Affected Version: <= 1.3.8
CVSS: 5.3Medium
Weakness type: CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
CVE: CVE-2017-1000226

View all Stop User Enumeration vulnerabilities

At a glance

CVE-2017-1000226 is a medium-severity Exposure of Sensitive Information to an Unauthorized Actor vulnerability in the Stop User Enumeration WordPress plugin, affecting versions <= 1.3.8. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.3.9; sites on affected versions should update now. Disclosed January 2017, reported by Glyn Wintle.

Vulnerability Overview

The Stop User Enumeration plugin for WordPress is vulnerable to Username Enumeration in versions up to, and including, 1.3.8 via the due to the REST API. This makes it possible for unauthenticated attackers to generate lists of usernames gathered from vulnerable services.

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, and no interaction from a victim user.

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

Reaching this weakness in Stop User Enumeration <= 1.3.8 takes no account at all. Sensitive information exposure means data the application intended to keep internal is returned to a caller who should not be able to see it.

The disclosed data — credentials, tokens, customer records or internal paths — is usually worth more as material for a follow-up attack than as an end in itself. For Stop User Enumeration the fix is 1.3.9: builds <= 1.3.8 are affected, anything from 1.3.9 onward is not.

Remediation

Update to version 1.3.9, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Stop User Enumeration 1.3.9 closes this, and updating the plugin is the step that ends it.

Login Security
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2017-1000226 https://www.wordfence.com/threat-intel/vulnerabilities/id/6fd6cb72-c508-46b1-99fb-cbd6b12b45de https://nvd.nist.gov/vuln/detail/CVE-2017-1000226

Related records

Same weakness class

Other vulnerabilities in Stop User Enumeration

CVSS Vector

5.3

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityLow
IntegrityNone
AvailabilityNone

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