wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php in the REST API implementation in WordPress 4.7 before...

Vulnerability Description

wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php in the REST API implementation in WordPress 4.7 before 4.7.1 does not properly restrict listings of post authors, which allows remote attackers to obtain sensitive information via a wp-json/wp/v2/users request.

References

• https://www.exploit-db.com/exploits/41497/
• https://wpvulndb.com/vulnerabilities/8715
• https://codex.wordpress.org/Version_4.7.1
• https://github.com/WordPress/WordPress/commit/daf358983cc1ce0c77bf6d2de2ebbb43df2add60
• http://www.openwall.com/lists/oss-security/2017/01/14/6
• https://www.wordfence.com/blog/2016/12/wordfence-blocks-username-harvesting-via-new-rest-api-wp-4-7/
• http://www.securitytracker.com/id/1037591
• https://wordpress.org/news/2017/01/wordpress-4-7-1-security-and-maintenance-release/
• http://www.securityfocus.com/bid/95391