CVE-2024-45244
📋 TL;DR
This vulnerability allows attackers to bypass timestamp validation in Hyperledger Fabric, potentially enabling transaction replay attacks or manipulation of transaction ordering. It affects all Hyperledger Fabric deployments using vulnerable versions. The issue stems from missing timestamp verification within the expected time window.
💻 Affected Systems
- Hyperledger Fabric
📦 What is this software?
Fabric by Hyperledger
⚠️ Risk & Real-World Impact
Worst Case
Attackers could replay old transactions, manipulate transaction ordering, or bypass time-based security controls, potentially leading to double-spending attacks or unauthorized state changes in blockchain networks.
Likely Case
Transaction replay attacks where attackers reuse valid transactions from different time periods, potentially causing inconsistent ledger states or bypassing time-based business logic.
If Mitigated
With proper network segmentation and additional validation layers, impact is limited to potential transaction ordering issues within isolated network segments.
🎯 Exploit Status
Exploitation requires network access to the Fabric peer and ability to craft/send transactions. Public proof-of-concept code demonstrates the timestamp spoofing technique.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 155457a6624b3c74b22e5729c35c8499bfe952cd and later versions
Vendor Advisory: https://github.com/hyperledger/fabric/commit/155457a6624b3c74b22e5729c35c8499bfe952cd
Restart Required: Yes
Instructions:
1. Update Hyperledger Fabric to a patched version (post-commit 155457a6624b3c74b22e5729c35c8499bfe952cd). 2. Restart all Fabric components (peers, orderers). 3. Verify timestamp validation is enforced in transaction processing.
🔧 Temporary Workarounds
Network Time Protocol (NTP) Enforcement
linuxEnforce strict NTP synchronization across all Fabric nodes to reduce timestamp manipulation opportunities
timedatectl set-ntp true
systemctl restart systemd-timesyncd
Transaction Validation Rules
allImplement custom chaincode validation that includes timestamp verification
🧯 If You Can't Patch
- Implement network segmentation to isolate Fabric components from untrusted networks
- Deploy additional monitoring for transaction timestamp anomalies and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check Fabric version: docker exec <peer_container> peer version | grep 'Version:'Check Version:
docker exec <peer_container> peer versionVerify Fix Applied:
Verify version is newer than vulnerable versions and test transaction timestamp validation📡 Detection & Monitoring
Log Indicators:
- Transaction timestamps outside expected windows
- Multiple identical transactions with different timestamps
- Timestamp validation failures
Network Indicators:
- Unusual transaction replay patterns
- Transactions with timestamps far from current time
SIEM Query:
source="fabric-peer" AND ("timestamp validation" OR "transaction replay")