A symbolic lesson in what happens when attackers leave behind breadcrumbs.
You thought updating your FortiGate VPN would send the hackers packing? Plot twist—they left a backdoor key hidden in your “language folder.” Symbolic links, folks. They’re the sneaky shortcuts no one invited to the patch party.
According to Fortinet, threat actors who previously breached systems via known vulnerabilities (like CVE-2022-42475 or CVE-2024-21762) quietly planted symbolic links. These links point from a seemingly harmless language file folder to the root filesystem of the device. And guess what? That trick still works even after you update the system.
It’s like evicting a tenant but forgetting they copied the key before they left.
Why do hackers love symbolic links?
Because they’re great at pointing fingers… and file paths.
This persistence method grants read-only access via the SSL-VPN web panel, which is like letting the attacker peer through the window with a telescope while you think your house is locked.
And the best part? It’s not even a new vulnerability—just an old one with really good social skills.
Cybersecurity Pro Tip:
If your VPN panel starts speaking in tongues, check the language folders.
It might be possessed… or just exploited.
So what should you do?
- Update your FortiOS to the latest secure version
- Search your filesystem for weird symbolic links
- Reset your secrets—passwords, tokens, keys, identity charms, all of it
- Pour yourself a strong cup of coffee and tell your firewall it deserves better
Symbolic links: harmless in Linux tutorials, but in production systems, they’re the digital equivalent of leaving a window cracked in a storm. Patch wisely, audit often, and never trust anything labeled “language support” again without a second glance.