Fgtsystemconf — Patched

Run the following command on any host where fgtsystemconf exists:

fgtsystemconf --version

Patched versions: 3.1.0, 3.0.6 (hotfix), 4.0.0 or later.
If you see 2.x or 3.0.0 through 3.0.5, you are vulnerable.

Q: Is fgtsystemconf part of a specific vendor's software? A: Primarily associated with FlexGen power generation managers, but also appears in rebranded Siemens or Fuji Electric configuration tools. If unsure, ask your OEM for the software bill of materials.

Q: Can I just delete fgtsystemconf? A: No. It is often a dependency. Deleting it will cause the HMI or gateway service to fail. Always patch, never remove. fgtsystemconf patched

Q: How do I scan my entire network for vulnerable versions? A: Use a simple Nmap script:

nmap -p 5515 --script=banner 192.168.1.0/24

If the banner says fgtsystemconf/2.x or 3.0.x, it's vulnerable.

Q: Does the patch require a reboot? A: No, just a restart of the fgt-gateway service. However, in safety-instrumented systems, a controlled restart may be required. Run the following command on any host where

If you are using an unpatched version of fgtsystemconf:

If you have identified that your system is running an unpatched fgtsystemconf, follow this playbook. Note: Downtime may be required for critical infrastructure.

Because this is niche operational technology (OT) software. Unlike Apache or OpenSSL, fgtsystemconf doesn't run on millions of public web servers. Instead, it runs on perhaps 10,000 to 50,000 industrial gateways worldwide, controlling hydroelectric dams, solar inverters, or assembly line robots. That rarity made it a prime target for Advanced Persistent Threats (APTs) like Dragonfly or Xenotime. Patched versions: 3

| Before (Vulnerable) | After (Patched) | | --- | --- | | Uses snprintf(cmd, "fgtsystemconf --set %s", user_input); system(cmd); | Uses fork() + execv("/usr/bin/fgtsystemconf", "--set", validated_param, NULL); | | No character filtering | Rejects any input containing ;, \, $, `, |, & | | Runs as root | Drops privileges to nobody before executing the config write |

Additionally, the patched version removes interactive shell fallbacks. Previously, if the config file was missing, the binary would drop to a sh shell. That feature is now completely gone.

The FGTSystemConf module allowed authenticated users to modify system parameters. However, a flaw existed where: