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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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价格未确认★ 509 GitHub Stars目录更新于 · 2026年9月5日agent-skill

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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

查看来源 ↗

文件元数据

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.

查看原始文本

---
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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许可证: MIT
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已记录技能来源

已记录技能指令路径，不代表本站运行测试、安全保证或兼容性认证。

安装前审查: 避免自动安装

许可证: 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

打开完整审计

工具列表来自元数据，并非已测试的兼容性；Agent 提示词是建议的交接方式。

从一个小任务开始

1阅读来源，确认输入、预期输出、依赖和权限。
2先让 Agent 提出计划，批准环境配置和费用，再进行隔离的小规模测试。
3检查输出和变更文件，只报告实际执行结果，并保留来源版本以便复现。

请在来源中核实依赖、API 密钥及第三方费用。公开仓库不代表所有服务免费。

来源与使用须知

已收录

仓库元数据和审核信号仅供参考。受欢迎、已发现来源、成功运行是不同的事实。

来源仓库: transilienceai/communitytools
许可证: MIT
版本: 1.0.0
最近 GitHub 推送: 2026年7月29日
目录更新于: 2026年9月5日
技能指令路径: skills/blockchain-security/SKILL.md @ 95fdc128af4c

版本来自目录元数据，使用前请核实来源发布记录。

质量

68/100

有潜力

信任

63/100

仅限沙盒

审计

75/100

需审查

打开完整审计查看评估报告

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

Verified installs: —
结果: —

复制不等于安装。安装数需有成功安装回报，不代表全面的质量保证。

Agent 接入

本页通过 Registry API 提供相同的决策、信任、审计、场景和安装信号，让 Agent 无需抓取界面即可排序。

打开安装 API LLM 文本格式打开 Manifest 自动解析计划

更多详情

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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"
  }
}

创作者工具

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此列表来自公开来源，维护者认领获批前不会标记为官方。

创作者: transilienceai
来源: transilienceai/communitytools
收录方: OpenAgentSkill 社区索引

归属链接指向公开仓库或创作者主页。创作者可认领列表以更新所有权信号。

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这条 Registry 收录列表归属于 transilienceai，但尚未标记为官方。认领后可增加已验证所有者信号，使后续发布、安装和审计更新更值得信赖。

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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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