Vulnerability Instance

This module exploits an underflow vulnerability in versions 7.1.x
          below 7.1.33, 7.2.x below 7.2.24 and 7.3.x below 7.3.11 of PHP-FPM on
          Nginx. Only servers with certains Nginx + PHP-FPM configurations are
          exploitable. This is a port of the original neex's exploit code (see
          refs.). First, it detects the correct parameters (Query String Length
          and custom header length) needed to trigger code execution. This step
          determines if the target is actually vulnerable (Check method). Then,
          the exploit sets a series of PHP INI directives to create a file
          locally on the target, which enables code execution through a query
          string parameter. This is used to execute normal payload stagers.
          Finally, this module does some cleanup by killing local PHP-FPM
          workers (those are spawned automatically once killed) and removing
          the created local file.

Stability:
  - crash-service-restarts
Reliability:
  - repeatable-session
SideEffects:
  - artifacts-on-disk
  - ioc-in-logs