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transilienceai

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blockchain-security

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

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Precio sin confirmar★ 509 Estrellas de GitHubRegistro actualizado · 5 sept 2026agent-skill

Resumen

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.

Leer documentación completa

Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

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

# 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
VulnerabilityCheck
ReentrancyExternal calls before state updates
Access controlMissing onlyOwner / msg.sender checks
Integer overflowSolidity < 0.8.0 without SafeMath
Delegatecall injectionUser-controlled delegatecall target
tx.origin authtx.origin instead of msg.sender
SelfdestructForce-send ETH, reset contract nonce
Weak randomnessblockhash/timestamp as entropy source
Empty array bypassLoop validation with no min-length check
Signature malleabilityRaw 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
Ver fuente ↗
Metadatos del archivo
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.
Ver texto original
---
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

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Licencia: MIT

  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • 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.
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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Empieza con una tarea pequeña

  1. 1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
  2. 2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
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Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.

Fuente y notas de uso

Indexado

Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.

Repositorio fuente
transilienceai/communitytools
Licencia
MIT
Versión
1.0.0
Último push de GitHub
29 jul 2026
Registro actualizado
5 sept 2026
Ruta de instrucciones
skills/blockchain-security/SKILL.md @ 95fdc128af4c

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

68/100

Prometedor

Confianza

63/100

Solo sandbox

Auditoría

75/100

Requiere revisión

Abrir auditoría completaVer informe de evaluación
  • Dependency or permission surface needs review
  • Permission surface may require sandboxing
  • 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.
  • Quality score needs review
  • Permission surface needs review: secrets or environment access, shell or command execution
  • Dependency/runtime risk: command execution surface, credential or environment access
  • Permission surface: secrets or environment access, shell or command execution
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Más detalles
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  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "transilienceai-blockchain-security",
      "task": "Use blockchain-security in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/transilienceai-blockchain-security",
    "api": "https://www.openagentskill.com/api/agent/skills/transilienceai-blockchain-security",
    "audit": "https://www.openagentskill.com/skills/transilienceai-blockchain-security/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=transilienceai-blockchain-security&task=Use%20blockchain-security%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20blockchain-security%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20blockchain-security%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/transilienceai-blockchain-security/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/transilienceai-blockchain-security"
  }
}

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[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/transilienceai-blockchain-security?metric=listed&label=Listed)](https://www.openagentskill.com/skills/transilienceai-blockchain-security?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/transilienceai-blockchain-security?metric=trust&label=Trust)](https://www.openagentskill.com/skills/transilienceai-blockchain-security?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/transilienceai-blockchain-security?metric=audit&label=Audit)](https://www.openagentskill.com/skills/transilienceai-blockchain-security/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/transilienceai-blockchain-security?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/transilienceai-blockchain-security?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
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