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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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Preis unbestätigt★ 509 GitHub-StarsVerzeichnis aktualisiert · 5. Sept. 2026agent-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

Quelle ansehen ↗

Dateimetadaten

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.

Originaltext anzeigen

---
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

Quelle prüfen

Preis und Betriebskosten

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Lizenz: MIT
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Skill-Quelle erfasst

Ein Anleitungspfad ist erfasst. Das ist kein Ausführungstest und keine Sicherheits- oder Kompatibilitätsgarantie.

Vor Installation prüfen: Automatische Installation vermeiden

Lizenz: 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

Vollständiges Audit öffnen

Tools sind Metadatenhinweise, keine getestete Kompatibilität. Prompts sind Vorschläge.

Mit einer kleinen Aufgabe beginnen

1Quelle lesen und Eingaben, Ergebnisse, Abhängigkeiten sowie Berechtigungen prüfen.
2Agent um einen Plan bitten. Einrichtung und Kosten vor einem isolierten Test genehmigen.
3Ergebnisse und geänderte Dateien prüfen. Nur tatsächliche Ausführungen melden und die Quellrevision aufbewahren.

Prüfe Abhängigkeiten, API-Schlüssel und externe Kosten in der Quelle. Öffentliche Repositories bedeuten nicht, dass alle Dienste kostenlos sind.

Quelle und Nutzungshinweise

Erfasst

Metadaten und Prüfungen dienen der Orientierung. Beliebtheit, Quellenerfassung und erfolgreiche Ausführung sind verschiedene Fakten.

Quell-Repository: transilienceai/communitytools
Lizenz: MIT
Version: 1.0.0
Letzter GitHub-Push: 29. Juli 2026
Verzeichnis aktualisiert: 5. Sept. 2026
Anleitungspfad: skills/blockchain-security/SKILL.md @ 95fdc128af4c

Version aus den Verzeichnismetadaten; Releases der Quelle prüfen.

Qualität

68/100

Vielversprechend

Vertrauen

63/100

Nur Sandbox

Audit

75/100

Prüfung nötig

Vollständiges Audit öffnen Eval-Bericht ansehen

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: —
Ergebnisse: —

Kopieren ist keine Installation. Zahlen benötigen eine Erfolgsmeldung und garantieren keine allgemeine Qualität.

Agent-Zugang

Die Registry API stellt Entscheidungs-, Vertrauens-, Audit-, Use-Case- und Installationssignale ohne UI-Scraping bereit.

Installations-API öffnen LLM-Textformat Manifest öffnen Auto-Auflösungsplan

Weitere Details

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      "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"
  }
}

Für Ersteller

Quelle des Eintrags

Registry-indexiert

Beanspruchbar

Dieser Eintrag wurde aus öffentlichen Quellen indexiert und ist erst nach Genehmigung eines Maintainer-Anspruchs offiziell.

Ersteller: transilienceai
Quelle: transilienceai/communitytools
Indexiert von: OpenAgentSkill Community-Index

Die Zuordnung verlinkt auf das öffentliche Repository oder Creator-Profil. Creator können den Eintrag beanspruchen, um Eigentümersignale zu aktualisieren.

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Dieser Registry-indexiert-Eintrag wird transilienceai zugeschrieben, ist aber noch nicht offiziell markiert. Beanspruche ihn, um ein verifiziertes Eigentümersignal hinzuzufügen und künftige Launch-, Installations- und Audit-Updates vertrauenswürdiger zu machen.

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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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