CVE-2025-27786
📋 TL;DR
Applio voice conversion tool versions 3.2.8-bugfix and prior contain a path traversal vulnerability that allows attackers to delete arbitrary files on the system. This occurs because user-controlled input is passed to file removal functions without proper validation. Anyone running vulnerable Applio versions is affected.
💻 Affected Systems
- Applio
📦 What is this software?
Applio by Applio
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through deletion of critical system files, leading to OS corruption, data loss, or service disruption.
Likely Case
Data loss through deletion of user files, application files, or configuration files, potentially causing service outages.
If Mitigated
Limited impact if proper file permissions restrict write access to sensitive directories.
🎯 Exploit Status
The vulnerability is well-documented in GitHub Security Lab advisories with technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: None
Restart Required: No
Instructions:
No official patch available. Monitor the Applio GitHub repository for updates.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation on the output_tts_path parameter to prevent path traversal.
# Modify core.py to validate output_tts_path parameter
# Ensure paths are restricted to safe directories
File Permission Restrictions
linuxRun Applio with minimal file system permissions to limit damage scope.
# Run as non-root user
# chmod 700 /path/to/applio/data
# setfacl -m u:appliouser:rwx /path/to/applio/data
🧯 If You Can't Patch
- Disable or restrict access to the vulnerable TTS functionality
- Implement network-level controls to limit who can access the Applio service
🔍 How to Verify
Check if Vulnerable:
Check Applio version. If version is 3.2.8-bugfix or earlier, it is vulnerable.Check Version:
Check the version in Applio's interface or configuration filesVerify Fix Applied:
Verify that output_tts_path parameter validation has been implemented in core.py and tts.py.📡 Detection & Monitoring
Log Indicators:
- Unexpected file deletion events
- Access to files outside expected directories
- Error messages related to file removal
Network Indicators:
- HTTP requests with path traversal patterns in output_tts_path parameter
SIEM Query:
source="applio.log" AND ("FileNotFoundError" OR "PermissionError" OR "removing" AND path="*")