The register_routes function in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php in the REST API in...

Vulnerability Description

The register_routes function in wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php in the REST API in WordPress 4.7.x before 4.7.2 does not require an integer identifier, which allows remote attackers to modify arbitrary pages via a request for wp-json/wp/v2/posts followed by a numeric value and a non-numeric value, as demonstrated by the wp-json/wp/v2/posts/123?id=123helloworld URI.

References

• https://codex.wordpress.org/Version_4.7.2
• https://make.wordpress.org/core/2017/02/01/disclosure-of-additional-security-fix-in-wordpress-4-7-2/
• https://blogs.akamai.com/2017/02/wordpress-web-api-vulnerability.html
• https://gist.github.com/leonjza/2244eb15510a0687ed93160c623762ab
• https://blog.sucuri.net/2017/02/content-injection-vulnerability-wordpress-rest-api.html
• https://github.com/WordPress/WordPress/commit/e357195ce303017d517aff944644a7a1232926f7
• https://wordpress.org/news/2017/01/wordpress-4-7-2-security-release/
• http://www.openwall.com/lists/oss-security/2017/02/10/16
• http://www.securitytracker.com/id/1037731