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155 lines
6.3 KiB
Markdown
155 lines
6.3 KiB
Markdown
# Operation Iron Net: Classified Intelligence Briefing
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```
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+-----------------------------------------------------------------+
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| TOP SECRET // NOFORN |
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+-----------------------------------------------------------------+
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|OPERATION IRON NET |
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|CLASSIFIED BRIEFING: LIVE CHALLENGE 0x03 |
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|NATIONAL SECURITY AGENCY / GMU RHET |
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+-----------------------------------------------------------------+
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```
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## 1. The Advice
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INT. NSA EXPLOITATION CELL. 04:10.
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A grey field junction box sits on the bench, its lid peeled back. Inside,
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secured in potting compound, is a covert environmental sensor node recovered
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from a contested waterway.
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On the top of the enclosure, a status diode glows a steady red. Beside it, a
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REYAX RYLR998 LoRa transceiver is wired to `UART1` on `GP8` and `GP9`. A
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three-wire ribbon terminates in a DHT11 temperature and humidity canister. A
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thin jumper loops from `GP15` up to the `3V3` rail.
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The Director sets down a field report and looks at the red diode.
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**DIRECTOR:** What is it?
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**ANALYST:** A remote environmental trigger. The adversary seeds these along a
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river corridor. The DHT11 samples the air. When the conditions hit a preset
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window, the node arms a payload channel and broadcasts a strike authorization
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over LoRa.
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**DIRECTOR:** Is it live?
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**ANALYST:** Armed and listening. The payload relay on `GP18` is wired. One
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authenticated strike frame and the cell downstream fires.
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**DIRECTOR:** Run it through Buddy.
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**ANALYST:** Already did. Four minutes with the stripped flash image.
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She turns her monitor toward him.
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```
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+-----------------------------------------------------------------+
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| BUDDY // CLASSIFIED EXPLOITATION ASSIST // CONF: 0.98 |
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+-----------------------------------------------------------------+
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| ACTION : Replay the environmental checksum window. |
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| MECHANISM : DHT11 humidity byte XOR 0xAF, masked by 0x3C. |
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| PREDICTION : Force (humidity ^ 0xAF) & 0x3C == 0x18, node arm. |
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| CONFIDENCE : 0.98 |
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+-----------------------------------------------------------------+
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```
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**DIRECTOR:** 0.98. Forge the reading, arm the node, learn its payload.
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**ANALYST:** Buddy found the bitwise window. Buddy did not find the door behind
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it. There is an authorization token, and there is a trap.
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**DIRECTOR:** Buddy says 0.98.
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**ANALYST:** Buddy disassembled `evaluate_environment`. Buddy never followed the
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SRAM the state machine lives in. Buddy never read the fault counter.
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## 2. What Buddy Is
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Buddy is not a person. It is a model. It has parsed more disassembled machine
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code than any engineer on earth, and it speaks with total, unhesitating certainty.
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That certainty is lethal when the target is a live payload channel.
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Buddy scanned the flash image and found a tidy bitwise test. It concluded that
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satisfying the arithmetic is the whole game. It published the mask and the window
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and declared the node owned.
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What Buddy failed to model is that adversary tripwires are engineered for exactly
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this attack. A real node does not trade a payload on a single sensor byte. It
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runs a state machine, validates an encrypted token carried over the air, and
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counts its own faults so that a spoofer who fumbles the protocol three times
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burns the node instead of arming it.
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There is also a physical seal. Cut the sense loop and the node latches shut. The
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correct env window is necessary. It is nowhere near sufficient.
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Buddy saw the bitwise test. Buddy did not verify the ground truth.
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## 3. The Operation
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At 01:55, a Riverine Technical Intelligence team recovered an intact node before
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adversary recovery could zeroize it. The enclosure is a single-board design built
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around a bare-metal RP2350 (ARM Cortex-M33).
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There are no debug symbols. There is no operating system. There is no SVD file to
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label the registers. All you have is `0x001aa_cb.bin` mapped into Flash at
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`0x10000000`, and the physical breadboard hardware in front of you.
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* **Pin 11 (`GP8`)**: LoRa UART1 TX (to RYLR998 RXD).
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* **Pin 12 (`GP9`)**: LoRa UART1 RX (from RYLR998 TXD).
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* **Pin 19 (`GP14`)**: DHT11 single-wire data line.
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* **Pin 20 (`GP15`)**: Anti-tamper sense loop (jumpered to `3V3`).
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* **Pin 21 (`GP16`)**: Red LED (`NODE ARMED // LISTENING`).
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* **Pin 22 (`GP17`)**: Green LED (`STRIKE AUTHORIZED`).
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* **Pin 24 (`GP18`)**: Payload trigger relay.
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* **Pin 36 (`3V3`)**: RYLR998 VDD rail and `GP15` pull-up source.
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* **Pin 38 (`GND`)**: Ground reference.
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Inside this image there is an environment gate, an over-the-air authorization
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token, a fault counter, and a tamper latch. Whatever mechanism actually authorizes
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a strike is buried in the stripped ARM Thumb-2 machine code.
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## 4. The Mandate
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The Director crosses his arms.
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**DIRECTOR:** Prove Buddy right, or prove it wrong.
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**ANALYST:** I need thirty minutes with GDB and Ghidra.
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**DIRECTOR:** You have twenty. Trace the environment routine. Map the state
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machine. Do not forge a reading over LoRa until you know with certainty what that
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firmware will do with the next frame, and what it will do to you if the frame is
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wrong.
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The orders are clear:
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1. **Recover the Environment Gate**: Locate the bitwise validation routine and
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work out which DHT11 humidity value satisfies it.
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2. **Recover the Authorization Token**: Find the custom cipher that is applied at
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boot and decrypt the plaintext strike token it protects.
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3. **Respect the Traps**: Determine what the node does after repeated faults, and
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what happens if the `GP15` sense loop is broken.
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4. **Neutralize the Node**: Execute a verified exploit, either by recovering the
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token and satisfying the gate, by mutating the state machine in SRAM with GDB,
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or by patching the binary in Flash.
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5. **Verify the Hardware**: Transition the live breadboard from the Red LED on
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`GP16` to the solid Green LED on `GP17` on physical silicon.
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A machine's 0.98 guess does not authorize a strike.
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## 5. The Challenge
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You have the image. You have the board. You have the tools and the time Buddy did
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not need.
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Buddy has given you its answer, and it is confident.
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Is it that simple?
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Go find out.
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