Nginx stack-based buffer overflow

Description
  • Greg MacManus, of iSIGHT Partners Labs, found a security problem in several recent versions of nginx. A stack-based buffer overflow might occur in a worker process while handling a specially crafted request, potentially resulting in arbitrary code execution (CVE-2013-2028).

    The problem affects nginx 1.3.9 - 1.4.0.
    The problem is fixed in nginx 1.5.0, 1.4.1.
Remediation
  • Patch for the problem can be found here:
    http://nginx.org/download/patch.2013.chunked.txt

    As a temporary workaround the following configuration can be used in each server{} block:
        if ($http_transfer_encoding ~* chunked) {
            return 444;
        }
    
References