CVE-2018-14063
📋 TL;DR
The increaseApproval function in Tracto (TRCT) ERC20 smart contract contains an integer overflow vulnerability. This allows attackers to manipulate token approval amounts, potentially stealing tokens from user accounts. Anyone holding or interacting with the TRCT token on Ethereum is affected.
💻 Affected Systems
- Tracto (TRCT) ERC20 Token Smart Contract
📦 What is this software?
Tracto by Tracto
⚠️ Risk & Real-World Impact
Worst Case
Attackers drain all approved tokens from vulnerable wallets, causing complete loss of funds for token holders.
Likely Case
Targeted exploitation of high-value wallets to steal significant token amounts.
If Mitigated
No impact if users haven't approved the vulnerable contract or use patched versions.
🎯 Exploit Status
Integer overflow exploitation is well-understood in smart contracts; public GitHub issue shows proof of concept
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed version in GitHub repository
Vendor Advisory: https://github.com/tracto2/Tracto-ERC20/issues/1
Restart Required: No
Instructions:
1. Deploy patched smart contract version 2. Migrate token holders to new contract 3. Discontinue use of vulnerable contract
🔧 Temporary Workarounds
Revoke Token Approvals
allRemove approval permissions for the vulnerable TRCT contract from your wallet
Use setApprovalForAll(contractAddress, false) or approve(contractAddress, 0)
🧯 If You Can't Patch
- Avoid interacting with the TRCT token contract entirely
- Move funds to wallets that have never approved the vulnerable contract
🔍 How to Verify
Check if Vulnerable:
Check if your wallet has approved the vulnerable TRCT contract address using Etherscan or wallet interfaceCheck Version:
Check contract source code on Etherscan for SafeMath implementationVerify Fix Applied:
Verify new contract deployment and check that it uses SafeMath or similar overflow protection📡 Detection & Monitoring
Log Indicators:
- Unusually large approval amounts in transaction logs
- Multiple approval transactions from same address
Network Indicators:
- Transactions calling increaseApproval with large values
- Suspicious contract interactions
SIEM Query:
Not applicable - blockchain transaction monitoring required