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WordPress Stop User Enumeration 1.2.4 Bypass

WordPress Stop User Enumeration 1.2.4 Bypass
Posted Feb 3, 2014
Authored by Andrew Horton (urbanadventurer) | Site morningstarsecurity.com

The WordPress Stop User Enumeration plugin version 1.2.4 can be bypassed by using POST requests instead of GET requests.

tags | exploit, bypass
MD5 | 622fcec0bc866f10c400f9581647461c

WordPress Stop User Enumeration 1.2.4 Bypass

Change Mirror Download
Stop User Enumeration is a WordPress plugin that provides protection
against an unauthenticated attacker gaining a list of all WordPress users.
This information can aid an attacker in further attacks against the website
including brute-force password guessing attacks. This can be performed
using wp-scan.
Homepage: http://wordpress.org/plugins/stop-user-enumeration/
Version: 1.2.4 (latest)

According to the full disclosure methodology I have publicly disclosed
this at the same time as notifying the vendor.

Advisory
-------------
An attacker can bypass the username enumeration protection by using POST
requests. The protection currently only stops GET requests to enumerate
users.

By sending POST requests with the body of "author=1" and incrementing the
number over successive requests, the entire set of WordPress users can be
enumerated.

The WordPress user information is disclosed in the HTML response body,
unlike being disclosed in the redirect header, as with GET requests.

1.

POST / HTTP/1.1
Host: www.wordpress.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 8

author=1











Andrew Horton (urbanadventurer)
www.morningstarsecurity.com

Visit my meta-aggregator of security news at
http://www.morningstarsecurity.com/news/

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