CVE-2022-28937
📋 TL;DR
This vulnerability in FISCO-BCOS blockchain nodes allows a malicious node to send invalid proposals with bad headers, causing normal nodes to stop processing new blocks and client requests. This affects all nodes running the vulnerable version, leading to denial of service in the blockchain network.
💻 Affected Systems
- FISCO-BCOS
📦 What is this software?
Fisco Bcos by Fisco Bcos
⚠️ Risk & Real-World Impact
Worst Case
Complete network disruption where all normal nodes stop processing transactions and producing blocks, effectively halting the blockchain.
Likely Case
Partial network disruption where affected nodes become unresponsive, causing transaction delays and potential consensus failures.
If Mitigated
Minimal impact if nodes are patched or isolated from malicious nodes.
🎯 Exploit Status
Exploitation requires the attacker to control a node in the network. The attack involves sending specially crafted invalid proposals.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after release-3.0.0-rc2
Vendor Advisory: https://github.com/FISCO-BCOS/FISCO-BCOS/issues/2312
Restart Required: Yes
Instructions:
1. Upgrade FISCO-BCOS to a version after release-3.0.0-rc2. 2. Restart all nodes. 3. Verify nodes are processing blocks normally.
🔧 Temporary Workarounds
Node Isolation
allTemporarily isolate or block malicious nodes from the network to prevent exploitation.
# Configure firewall rules to block suspicious nodes
# Use network segmentation to isolate untrusted nodes
🧯 If You Can't Patch
- Implement strict node admission controls to prevent untrusted nodes from joining the network.
- Monitor network traffic for abnormal proposal patterns and block suspicious nodes immediately.
🔍 How to Verify
Check if Vulnerable:
Check if running FISCO-BCOS release-3.0.0-rc2 version. Monitor if nodes stop producing blocks after receiving proposals.Check Version:
./fisco-bcos --versionVerify Fix Applied:
Verify upgraded to version after release-3.0.0-rc2. Test by sending normal proposals and confirming blocks are produced.📡 Detection & Monitoring
Log Indicators:
- Nodes stopping block production
- Error messages about invalid proposals or headers
- Consensus failures in logs
Network Indicators:
- Sudden drop in block production rate
- Increased network traffic with malformed proposals
SIEM Query:
source="fisco-bcos.log" AND ("invalid proposal" OR "stop producing blocks" OR "consensus error")