Hey everyone,
If you caught my last post about Go4Hive, you know I’ve been building a ultra-minimalist, text-centric reader for the Hive blockchain. It’s all about that retro terminal aesthetic: green text, blocky cursors, and zero bloat.
But "minimalist" shouldn't mean "insecure."
Google recently released a neat security extension for the Gemini CLI (you can find it here), so I thought I’d give it a whirl. I pointed it at the go4hive repo and, honestly, I’m glad I did. It surfaced three specific issues that needed my attention, and it even wrote Proof-of-Concept attacks that worked!
Two of them were immediate "fix right now" items, and the third is leading me down a very productive refactoring rabbit hole.
The Findings
1. The Handshake Bypass (Critical)
This was the "Oh no" moment. My login flow for Hive Keychain was relying too much on the client-side. The app was setting the session user after the client reported a successful signature, but the server-side view wasn't actually verifying that signature itself.
An attacker could have just navigated directly to the handshake URL and spoofed any username they wanted. Not that it would have affected much, you still need to sign everything with keychain, but I didn't want people to be able to take over sessions.
The Fix: I moved the signature verification entirely to the server. We now use hive-nectar to validate the challenge-response properly before the session is ever touched.
2. Open Redirect in Theme Selection (High)
I love my CRT themes (Amber, Green, White), but I was a bit sloppy with the next parameter in the theme switcher. It was taking a URL from the query string and redirecting the user without checking if it was staying within the app. This is a classic "Open Redirect" vulnerability that could be used for phishing.
The Fix: I’ve added proper host validation using Django’s url_has_allowed_host_and_scheme. Now, it only redirects you if the destination is safe.
3. The ecdsa Dependency (High/Pending)
The scanner flagged a known vulnerability in the python-ecdsa library (the Minerva timing attack on P-256).
Now, technically, this doesn't impact Hive directly because we don't use the P-256 curve in the hive-nectar code: we’re all about secp256k1. However, having a vulnerable dependency in the uv.lock file is just bad practice.
The Plan: Instead of just patching it, I’ve decided to use this as an excuse to remove python-ecdsa entirely.
I’m currently mid-refactor to move our secp256k1 math and signing logic over to the more robust cryptography library. It’s a bit of a deep dive into point math and signature recovery, but it’ll result in a cleaner, faster, and more secure SDK. I’ve already got a detailed TODO list and several phases of testing mapped out to ensure we don't break transaction signing or BIP32 derivation.
Better Safe Than Sorry
Even on a "fun" side project like this, security matters. The blockchain is a public ledger, and any weakness in the interface can be exploited.
If you're building on Hive (or anywhere else), I highly recommend running an audit on your codebase. Whether you use the Gemini extension or a manual review, it’s worth the time.
You can check out the latest (hardened) code over on GitHub:
GitHub Repo: https://github.com/TheCrazyGM/go4hive
Stay secure out there.
As always,
Michael Garcia a.k.a. TheCrazyGM