Description
ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.
Remediation
References
Related Vulnerabilities
Apache HTTP Server CVE-2005-2700 Vulnerability (CVE-2005-2700)
WordPress Plugin Canalplan Cross-Site Scripting (3.22)
WordPress 3.9.x Multiple Vulnerabilities (3.9 - 3.9.37)
Oracle JRE CVE-2013-2417 Vulnerability (CVE-2013-2417)
WordPress Plugin BuddyPress Multiple Cross-Site Request Forgery Vulnerabilities (2.8.1)