CVE-2025-50817
📋 TL;DR
CVE-2025-50817 is a disputed vulnerability in Python-Future 1.0.0 where the module automatically imports a file named test.py if present in accessible directories, potentially allowing arbitrary code execution. This affects systems where attackers can write files to directories in Python's sys.path. The vulnerability is disputed as some consider it a documented Python import system feature rather than a security flaw.
💻 Affected Systems
- python-future
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise with arbitrary code execution leading to data theft, lateral movement, or ransomware deployment.
Likely Case
Limited code execution in specific contexts where attackers have file write permissions but not full system access.
If Mitigated
No impact if proper file permissions and directory isolation prevent unauthorized file writes.
🎯 Exploit Status
Exploitation requires file write capability to directories in sys.path. Proof of concept available in references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1
Vendor Advisory: https://github.com/PythonCharmers/python-future
Restart Required: No
Instructions:
1. Run: pip install --upgrade future
2. Verify installation with: pip show future
3. Ensure version is 1.0.1 or higher
🔧 Temporary Workarounds
Remove test.py files
allRemove any test.py files from directories in Python's sys.path
find /path/to/python/environment -name 'test.py' -delete
Restrict file permissions
Unix/LinuxSet strict permissions on directories in sys.path to prevent unauthorized file writes
chmod 755 /path/to/python/directories
chown root:root /path/to/python/directories
🧯 If You Can't Patch
- Implement strict file system permissions to prevent unauthorized writes to Python directories
- Monitor for creation of test.py files in Python environment directories
🔍 How to Verify
Check if Vulnerable:
Check if python-future version 1.0.0 is installed and if test.py files exist in Python import pathsCheck Version:
pip show future | grep VersionVerify Fix Applied:
Verify python-future version is 1.0.1 or higher and test.py files are removed from import paths📡 Detection & Monitoring
Log Indicators:
- Unexpected import of test.py modules
- File creation events for test.py in Python directories
Network Indicators:
- Unusual outbound connections from Python processes after test.py imports
SIEM Query:
source="file_system" AND (file_name="test.py" AND file_path CONTAINS "python") OR (process="python" AND command_line CONTAINS "test.py")