CVE-2022-24788
📋 TL;DR
CVE-2022-24788 is a buffer overrun vulnerability in Vyper smart contract language where importing functions from JSON interfaces that return bytes generates insecure bytecode without proper length validation. This affects developers using Vyper versions before 0.3.2 to create Ethereum smart contracts. The vulnerability could allow attackers to manipulate contract execution through buffer overflows.
💻 Affected Systems
- Vyper smart contract language
📦 What is this software?
Vyper by Vyperlang
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of smart contract functionality leading to theft of funds, contract manipulation, or denial of service through arbitrary code execution in the EVM context.
Likely Case
Smart contract malfunction, unexpected behavior, or potential loss of funds due to buffer overflow conditions during contract execution.
If Mitigated
No impact if contracts are compiled with patched Vyper version and deployed on blockchain.
🎯 Exploit Status
Exploitation requires understanding of smart contract bytecode and EVM execution. No public exploits documented in advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.3.2 and later
Vendor Advisory: https://github.com/vyperlang/vyper/security/advisories/GHSA-4mrx-6fxm-8jpg
Restart Required: No
Instructions:
1. Upgrade Vyper using pip: 'pip install --upgrade vyper>=0.3.2' 2. Recompile all existing smart contracts with the updated version 3. Redeploy recompiled contracts to blockchain
🔧 Temporary Workarounds
No workarounds available
allThe vendor advisory states there are no known workarounds for this vulnerability
🧯 If You Can't Patch
- Audit all smart contracts for imports from JSON interfaces returning bytes and consider rewriting affected contracts
- Implement additional contract monitoring and emergency pause functionality to respond to potential exploitation
🔍 How to Verify
Check if Vulnerable:
Check Vyper version with 'vyper --version'. If version is below 0.3.2, check if contracts import functions from JSON interfaces that return bytes.Check Version:
vyper --versionVerify Fix Applied:
Verify Vyper version is 0.3.2 or higher with 'vyper --version'. Recompile contracts and verify bytecode generation.📡 Detection & Monitoring
Log Indicators:
- Unusual contract behavior, failed transactions, or gas limit exceptions on deployed contracts
Network Indicators:
- Abnormal transaction patterns targeting specific contract functions
SIEM Query:
Not applicable - smart contract execution occurs on blockchain, not traditional enterprise networks🔗 References
- https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b
- https://github.com/vyperlang/vyper/security/advisories/GHSA-4mrx-6fxm-8jpg
- https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b
- https://github.com/vyperlang/vyper/security/advisories/GHSA-4mrx-6fxm-8jpg
