CVE-2025-62703
📋 TL;DR
This CVE describes a remote code execution vulnerability in Fugue's RPC server implementation. Attackers can send malicious pickle data that gets deserialized without sanitization, allowing arbitrary code execution on the server. Users running Fugue version 0.9.2 or earlier with FlaskRPCServer enabled are affected.
💻 Affected Systems
- Fugue
📦 What is this software?
Fugue by Fugue Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Fugue server with full system access, data exfiltration, and lateral movement within the network.
Likely Case
Unauthorized code execution leading to data theft, service disruption, or installation of backdoors.
If Mitigated
Limited impact if network segmentation and proper access controls prevent exploitation.
🎯 Exploit Status
Pickle deserialization vulnerabilities are well-understood and easily weaponized. The advisory provides technical details that could facilitate exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 6f25326
Vendor Advisory: https://github.com/fugue-project/fugue/security/advisories/GHSA-xv5p-fjw5-vrj6
Restart Required: Yes
Instructions:
1. Update Fugue to a version containing commit 6f25326 or later. 2. Restart all Fugue services. 3. Verify the fix by checking the version and testing RPC functionality.
🔧 Temporary Workarounds
Disable FlaskRPCServer
allTemporarily disable the vulnerable RPC server component if not required.
Modify Fugue configuration to disable FlaskRPCServer
Network Segmentation
allRestrict network access to Fugue RPC endpoints.
Configure firewall rules to limit access to Fugue RPC ports
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Fugue RPC endpoints
- Monitor for unusual pickle deserialization patterns or unexpected code execution
🔍 How to Verify
Check if Vulnerable:
Check if Fugue version is 0.9.2 or earlier and FlaskRPCServer is enabled in configuration.Check Version:
python -c "import fugue; print(fugue.__version__)"Verify Fix Applied:
Verify the installed version includes commit 6f25326 and test RPC functionality with safe payloads.📡 Detection & Monitoring
Log Indicators:
- Unusual pickle deserialization errors
- Unexpected process execution from Fugue services
- Abnormal RPC request patterns
Network Indicators:
- Malformed pickle data in RPC communications
- Unexpected outbound connections from Fugue servers
SIEM Query:
source="fugue" AND (event="deserialization_error" OR process_execution="unexpected")