Add module for CVE-2024-21762 FortiOS out-of-bounds write to RCE

[jheysel-r7]

Summary

A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests

Basic example

PoC

Motivation

The application is widely used and is currently being exploited

[sempervictus]

Seconded, this may be a poor fix to a prior cve in the same stack and may be ripe terrain to find more. Infra for the sslvpn interfaces would be great and probably useful again down the line (as well as to backfill prior exploits).
Small note of caution: the automatic updates for the fixed versions seem to be broken for a lot of users so this ones very much still out in the wild and may be for some time if the broken versions preclude auto-update (as opposed to some server side issue).

[iNoSec2]

Second it too. It will be a nice module to add since we see some of them in pentest