I built an AI webapp defender that autonomously patches code in response to attacks

Hi all, I built an open source PoC AI security tool called Mahoraga Webapp Defender that I wanted to share with you.

If you were paying attention to cybersecurity news lately, you might have heard that Anthropic's Claude Mythos has been successfully exploiting (finding zero days in) pretty much every software it touches fully autonomously. Agentic attack frameworks now outnumber human attackers 82:1 and compress what used to be days of manual pentesting into minutes. Imo, our current security model of humans patching bugs at human speeds is no longer going to be effective.

I wanted to see what the other side of the equation might look like. So I built Mahoraga Webapp Defender, an experiment in real-time, self-healing webapp defense. If you read/watched Jujutsu Kaisen, Mahoraga is a shikigami that adapts to any technique used to kill it. Every attack makes it stronger. That is the defensive posture I wanted to prototype.

The system runs two copies of the target website: a real one, and an identical shadow copy with fake data. A rule-based Watcher scores every user session for threat signals (injection, enumeration, honeypot hits, etc.). If the score crosses a threshold, the session is silently redirected to the shadow environment, where the attacker continues their adversarial activities.

When the attacker finds an exploit in the shadow environment, a Shadow Analyzer agent reads the logs, identifies the exploit, and hands the analysis to a Fixer agent that reads the actual source code, writes a patch, and hands it to a Reviewer agent. If the review passes, the patch is deployed to the real environment, all while the attacker is still poking at the decoy.

My MIT-licensed repo consists of the code for the defender and a pentesting challenge website with 12 CTF flags so you can pentest it with or without the defender activated: https://github.com/AgeOfAlgorithms/Mahoraga-Website-Defender

Would love feedback, ideas, or code/issue contributions. Also would love to know if you know of anyone else working on a similar idea. Thanks for reading!

submitted by /u/AgeOfAlgorithms
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from hacking: security in practice https://ift.tt/K9peJ6g