adding validated services? patching forcad_local.py

OmCTF-2025/sploits/block-game/README.md

@@ -0,0 +1,20 @@
+# Sploit 1
+
+Flagstore 1. Unbeatable levels (their prizes)
+
+Vulnerability: No bounds check in the MoveOutOfWay function (checked on the client side). The levels are beatable by going out of bounds.
+
+Fix: Add bounds check in the MoveOutOfWay function:
+```Go
+if p.X < 0 || p.Y < 0 || p.X >= sess.Tiles.size || p.Y >= sess.Tiles.size {
+    return false
+}
+```
+
+# Sploit 2
+
+Flagstore 2. Private levels (their prizes)
+
+Vulnerability: Backdoor in the Level.CreateFrom function (hidden in the template with a bunch of tabs which get it out of the screen). It creates a user with name and password both equal to `sha256(level_name)[:32]`, which can then be used to access the level and the flag.
+
+Fix: remove the backdoor code from `create_from.tmpl` and regenerate OR remove it directly from `create_from.go`.