blockchain-security: Security & Code Review for AI Agents | OpenAgentSkill

Overview

Smart contract security testing and blockchain CTF exploitation. Covers Solidity vulnerability analysis, EVM storage manipulation, delegatecall attacks, CREATE/CREATE2 address prediction, and common DeFi exploit patterns. Use when analyzing Solidity contracts, solving blockchain challenges, or testing smart contract security.

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Blockchain Security

Quick Start

Download and decompile contracts (source or bytecode)
Map storage layout and identify privileged operations
Check for delegatecall, CREATE address prediction, reentrancy, access control
Deploy exploit contracts via web3.py or cast/forge
Verify win condition (isSolved/flag endpoint)

Blockchain CTF Challenge Pattern

# Get connection info
curl http://$HOST:$PORT/connection_info  # -> PrivateKey, Address, TargetAddress, setupAddress
# RPC endpoint
RPC_URL="http://$HOST:$PORT/rpc"
# Win condition: Setup.isSolved() must return true

Key Attack Vectors

1. Delegatecall Storage Manipulation

When contract A does delegatecall to contract B, B's code runs with A's storage.

Deploy exploit contract that mirrors A's storage layout
Exploit contract writes to A's storage slots via delegatecall
Critical: Storage layout must match exactly (same slot ordering)
See reference/delegatecall-attacks.md

2. CREATE Address Prediction (Nonce Manipulation)

Contract addresses from CREATE are deterministic: keccak256(rlp([sender, nonce]))[12:]

Brute-force nonce to find which nonce produces target address
Send dummy transactions (self-transfers) to increment nonce
Deploy exploit contract at the exact nonce that hits target address
See reference/create-address-prediction.md

3. Storage Layout & Slot Computation

Mappings: keccak256(h(key) || uint256(slot_number))
- Value types: h(k) = abi.encode(k) (left-padded to 32 bytes)
- String/bytes: h(k) = keccak256(k)
Read private variables via eth_getStorageAt
See reference/storage-layout.md

4. Empty Array / Zero-Length Input Bypass

When a function loops over a user-supplied array to validate items (signatures, approvals, votes), passing an empty array skips the loop entirely. If there's no minimum-length check, validation is bypassed.

Check: for (uint i = 0; i < arr.length; i++) with no require(arr.length >= N)
Exploit: Call the function with [] to skip all validation

5. ECDSA Signature Malleability

Raw ecrecover accepts both (v, r, s) and (v', r, N-s) (where N = secp256k1 order, v flipped 27↔28). If a contract deduplicates signatures by hash of raw bytes, the malleable form has a different hash but recovers to the same signer.

Check: ecrecover used without s <= N/2 enforcement (OpenZeppelin's ECDSA.sol enforces this)
Exploit: Take a known valid signature, compute new_s = N - s, flip v, submit as "new" signature

6. Common Vulnerability Classes

Vulnerability	Check
Reentrancy	External calls before state updates
Access control	Missing onlyOwner / msg.sender checks
Integer overflow	Solidity < 0.8.0 without SafeMath
Delegatecall injection	User-controlled delegatecall target
tx.origin auth	`tx.origin` instead of `msg.sender`
Selfdestruct	Force-send ETH, reset contract nonce
Weak randomness	blockhash/timestamp as entropy source
Empty array bypass	Loop validation with no min-length check
Signature malleability	Raw ecrecover without s-normalization

Tools

# web3.py essentials
from web3 import Web3
w3 = Web3(Web3.HTTPProvider(RPC_URL))
acct = w3.eth.account.from_key(PRIVATE_KEY)

# Read private storage
w3.eth.get_storage_at(contract_addr, slot)

# Deploy contract
from solcx import compile_source, install_solc
install_solc("0.8.13")
compiled = compile_source(source, output_values=["abi", "bin"], solc_version="0.8.13")

# Send raw bytecode deployment
tx = {'data': bytecode, 'gas': 3000000, 'gasPrice': w3.eth.gas_price, 'nonce': nonce, 'chainId': chain_id}
signed = acct.sign_transaction(tx)
w3.eth.send_raw_transaction(signed.raw_transaction)

Reference

Critical Rules

Always read storage before attacking (private vars are readable on-chain)
Mirror exact storage layout when exploiting delegatecall
For CREATE nonce brute-force, check nonces 0-100000+ systematically
CTF instances are often ephemeral -- script the full attack for speed

View source ↗

File metadata

name: blockchain-security
description: Smart contract security testing and blockchain CTF exploitation. Covers Solidity vulnerability analysis, EVM storage manipulation, delegatecall attacks, CREATE/CREATE2 address prediction, and common DeFi exploit patterns. Use when analyzing Solidity contracts, solving blockchain challenges, or testing smart contract security.

View original text

---
name: blockchain-security
description: Smart contract security testing and blockchain CTF exploitation. Covers Solidity vulnerability analysis, EVM storage manipulation, delegatecall attacks, CREATE/CREATE2 address prediction, and common DeFi exploit patterns. Use when analyzing Solidity contracts, solving blockchain challenges, or testing smart contract security.
---

# Blockchain Security

## Quick Start
1. Download and decompile contracts (source or bytecode)
2. Map storage layout and identify privileged operations
3. Check for delegatecall, CREATE address prediction, reentrancy, access control
4. Deploy exploit contracts via web3.py or cast/forge
5. Verify win condition (isSolved/flag endpoint)

## Blockchain CTF Challenge Pattern
```bash
# Get connection info
curl http://$HOST:$PORT/connection_info  # -> PrivateKey, Address, TargetAddress, setupAddress
# RPC endpoint
RPC_URL="http://$HOST:$PORT/rpc"
# Win condition: Setup.isSolved() must return true
```

## Key Attack Vectors

### 1. Delegatecall Storage Manipulation
When contract A does `delegatecall` to contract B, B's code runs with A's storage.
- Deploy exploit contract that mirrors A's storage layout
- Exploit contract writes to A's storage slots via delegatecall
- **Critical**: Storage layout must match exactly (same slot ordering)
- See [reference/delegatecall-attacks.md](reference/delegatecall-attacks.md)

### 2. CREATE Address Prediction (Nonce Manipulation)
Contract addresses from CREATE are deterministic: `keccak256(rlp([sender, nonce]))[12:]`
- Brute-force nonce to find which nonce produces target address
- Send dummy transactions (self-transfers) to increment nonce
- Deploy exploit contract at the exact nonce that hits target address
- See [reference/create-address-prediction.md](reference/create-address-prediction.md)

### 3. Storage Layout & Slot Computation
- Mappings: `keccak256(h(key) || uint256(slot_number))`
  - Value types: `h(k) = abi.encode(k)` (left-padded to 32 bytes)
  - String/bytes: `h(k) = keccak256(k)`
- Read private variables via `eth_getStorageAt`
- See [reference/storage-layout.md](reference/storage-layout.md)

### 4. Empty Array / Zero-Length Input Bypass
When a function loops over a user-supplied array to validate items (signatures, approvals, votes), passing an **empty array** skips the loop entirely. If there's no minimum-length check, validation is bypassed.
- Check: `for (uint i = 0; i < arr.length; i++)` with no `require(arr.length >= N)`
- Exploit: Call the function with `[]` to skip all validation

### 5. ECDSA Signature Malleability
Raw `ecrecover` accepts both `(v, r, s)` and `(v', r, N-s)` (where N = secp256k1 order, v flipped 27↔28). If a contract deduplicates signatures by hash of raw bytes, the malleable form has a different hash but recovers to the same signer.
- Check: `ecrecover` used without `s <= N/2` enforcement (OpenZeppelin's ECDSA.sol enforces this)
- Exploit: Take a known valid signature, compute `new_s = N - s`, flip `v`, submit as "new" signature

### 6. Common Vulnerability Classes
| Vulnerability | Check |
|---|---|
| Reentrancy | External calls before state updates |
| Access control | Missing onlyOwner / msg.sender checks |
| Integer overflow | Solidity < 0.8.0 without SafeMath |
| Delegatecall injection | User-controlled delegatecall target |
| tx.origin auth | `tx.origin` instead of `msg.sender` |
| Selfdestruct | Force-send ETH, reset contract nonce |
| Weak randomness | blockhash/timestamp as entropy source |
| Empty array bypass | Loop validation with no min-length check |
| Signature malleability | Raw ecrecover without s-normalization |

## Tools
```python
# web3.py essentials
from web3 import Web3
w3 = Web3(Web3.HTTPProvider(RPC_URL))
acct = w3.eth.account.from_key(PRIVATE_KEY)

# Read private storage
w3.eth.get_storage_at(contract_addr, slot)

# Deploy contract
from solcx import compile_source, install_solc
install_solc("0.8.13")
compiled = compile_source(source, output_values=["abi", "bin"], solc_version="0.8.13")

# Send raw bytecode deployment
tx = {'data': bytecode, 'gas': 3000000, 'gasPrice': w3.eth.gas_price, 'nonce': nonce, 'chainId': chain_id}
signed = acct.sign_transaction(tx)
w3.eth.send_raw_transaction(signed.raw_transaction)
```

## Reference
- [Delegatecall Attacks](reference/delegatecall-attacks.md)
- [CREATE Address Prediction](reference/create-address-prediction.md)
- [Storage Layout](reference/storage-layout.md)

## Critical Rules
- Always read storage before attacking (private vars are readable on-chain)
- Mirror exact storage layout when exploiting delegatecall
- For CREATE nonce brute-force, check nonces 0-100000+ systematically
- CTF instances are often ephemeral -- script the full attack for speed

Review the source

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Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

Financial research output is not financial advice; require human review before any live investment decision
No explicit warning about using these techniques only on authorized targets (e.g., CTF challenges or contracts you own).
Financial research output is not financial advice; require human review before any live investment decision.
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License: MIT
Version: 1.0.0
Last GitHub push: Jul 29, 2026
Registry updated: Sep 5, 2026
Instruction path: skills/blockchain-security/SKILL.md @ 95fdc128af4c

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