CVE-2022-24845
📋 TL;DR
This vulnerability in Vyper smart contract language allows integer overflow/underflow when using <iface>.returns_int128() in complex expressions, leading to incorrect integer interpretation and potential contract logic manipulation. It affects Ethereum smart contracts written in Vyper versions before 0.3.0. Developers using Vyper for Ethereum smart contracts are impacted.
💻 Affected Systems
- Vyper
📦 What is this software?
Vyper by Vyperlang
⚠️ Risk & Real-World Impact
Worst Case
Smart contract funds could be stolen or locked due to integer miscalculations, leading to significant financial loss in DeFi applications.
Likely Case
Smart contracts produce incorrect calculations or behave unexpectedly, potentially causing transaction failures or incorrect token transfers.
If Mitigated
With proper validation and bounds checking, contracts function correctly but may still be vulnerable if using affected Vyper versions.
🎯 Exploit Status
Exploitation requires understanding of smart contract interactions and integer overflow conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.0 and later
Vendor Advisory: https://github.com/vyperlang/vyper/security/advisories/GHSA-j2x6-9323-fp7h
Restart Required: No
Instructions:
1. Upgrade Vyper to version 0.3.0 or later using pip: pip install vyper>=0.3.0
2. Recompile and redeploy all affected smart contracts
3. Test contracts thoroughly after upgrade
🔧 Temporary Workarounds
No workaround available
allThe advisory states there is no known workaround for this issue
🧯 If You Can't Patch
- Audit all smart contracts for use of <iface>.returns_int128() in complex expressions
- Implement additional manual bounds checking in contract logic where this function is used
🔍 How to Verify
Check if Vulnerable:
Check Vyper version with: vyper --version. If version is below 0.3.0, check contracts for <iface>.returns_int128() usage in complex expressions.Check Version:
vyper --versionVerify Fix Applied:
Verify Vyper version is 0.3.0 or higher: vyper --version. Test contracts that use <iface>.returns_int128() with edge case values.📡 Detection & Monitoring
Log Indicators:
- Smart contract transaction failures
- Unexpected integer values in contract state changes
Network Indicators:
- Unusual contract interactions targeting functions using returns_int128()
SIEM Query:
Not applicable - this is a smart contract language vulnerability🔗 References
- https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b
- https://github.com/vyperlang/vyper/security/advisories/GHSA-j2x6-9323-fp7h
- https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b
- https://github.com/vyperlang/vyper/security/advisories/GHSA-j2x6-9323-fp7h
