XREX CISO Open-Sources Two Web3 Security Tools to Enhance Smart Contract Development

Editor's Note:
Sun Huang, XREX Chief Information Security Officer (CISO) & General Manager, brings over 15 years of international cybersecurity expertise. Certified as an Offensive Security Certified Professional (OSCP), Ethical Hacker (CEH), and AWS Security Specialist, Sun recently open-sourced two Web3 security tools to empower developers in building safer smart contracts. This article explores their development rationale and provides hands-on usage examples.

Why These Tools Were Created

As XREX’s CISO, I initiated internal training in March 2025 to elevate our team’s Web3 security analysis and blockchain threat-assessment capabilities. These efforts culminated in the June and July 2025 releases of DeFiHackLabs and DeFiVulnLabs—tools designed to demystify smart contract vulnerabilities through reproducible attack simulations.

Key Motivations:

• Post-Hack Analysis: After each DeFi exploit, XREX replicates attacks by forking blockchain states to study exploit mechanics.
• Knowledge Sharing: Open-sourcing these tools extends our learnings to the broader Web3 community.

👉 Explore DeFiHackLabs now

Tool 1: DeFiVulnLabs (Beginner-Friendly)

Focus: 19 common Solidity vulnerabilities, including reentrancy and oracle manipulation.

Usage Example: ERC777 Reentrancy Attack

Objective: Bypass a token supply cap (≤1,000 tokens) by exploiting callback functions.

1. Code Execution:

   forge test --contracts ./src/test/ERC777-reentrancy.sol -vvv

2. Attack Flow:

   • The attacker’s contract triggers tokensReceived() during transfer().
   • Malicious code re-enters mint(), minting an extra 9,000 tokens.

Outcome: Token balance surges from 1,000 to 10,000.

Tool 2: DeFiHackLabs (Intermediate Level)

Focus: 42 real-world DeFi exploit recreations, like Inverse Finance’s $1.2M oracle manipulation (June 2022).

Usage Example: Flashloan Attack Simulation

1. Run:

   forge test --contracts ./src/test/InverseFinance_exp.sol -vvv

2. Key Takeaway: Insecure price oracles enable collateral price spoofing via flash loans.

👉 Master DeFi security with DeFiHackLabs

FAQ Section

1. Who should use these tools?

• Developers building DeFi protocols.
• Auditors seeking real-world exploit patterns.

2. What’s the prerequisite knowledge?

• Basic Solidity and Foundry framework familiarity.

3. How do these tools improve security?

• Provide actionable PoCs to preempt common vulnerabilities.

4. Are updates planned?

• Yes! Community feedback drives new vulnerability additions.

Conclusion

Sun Huang’s tools bridge the gap between theoretical security and实战 (practical defense). By studying past exploits, developers can fortify contracts against emerging threats.

Connect with Sun: @1nf0s3cpt

Originally published on ABMedia.

Co-authors: Sun Huang, Seal Cao, Yoyo Yu, Fred Lai.

Tags: #Web3Security #SmartContracts #DeFi #Blockchain #XREX
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