[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

WordPress <=v4.4 Username Exists Information Disclosure

Information security research credited to John Martinelli @ SECURELI.com. (john@xxxxxxxxxxxx)


Affects: WordPress <=v4.4
Vulnerability: Information Disclosure
CVE-ID: Pending
Impact: Username exists disclosure on /wp-login.php


By default, WordPress <=4.4 discloses whether a username is registered inside the system, allowing attackers the opportunity to do brute-force password cracking attacks.

One proof of concept would be to scrape Alexa.com for WordPress running domains, check automatically whether it confirms the username (possibly top 100 most popular WP usernames) exists in the WordPress users table using a simple RegEx boolean to determine “IF USER EXISTS”, then to send a Selenium automated browser to attempt logins with top 10 most popular passwords.

Would easily allow attackers to login and with publishing or editing permissions, install malware onto the WordPress installation as well as potentially escalate privileges on the hosting account if running vulnerable versions of WordPress or plugins.

**** Proof screenshot @ http://secureli.com/information-security-research/wordpress/ ****