CVE-2025-69620
📋 TL;DR
A path traversal vulnerability in Moo Chan Song v4.5.7 allows attackers to write arbitrary files to internal storage, potentially causing Denial of Service (DoS) by filling disk space or corrupting critical files. This affects all systems running the vulnerable version of Moo Chan Song software. Attackers could disrupt service availability without authentication.
💻 Affected Systems
- Moo Chan Song
📦 What is this software?
Office Reader by Ntoolslab
⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability due to disk exhaustion, critical file corruption, or service crash, potentially requiring system restoration from backups.
Likely Case
Service disruption through disk space consumption, degraded performance, or temporary unavailability until files are cleaned up.
If Mitigated
Limited impact with proper file permission controls, disk quotas, and monitoring in place to detect abnormal file writes.
🎯 Exploit Status
Path traversal vulnerabilities are typically easy to exploit with publicly available tools. The GitHub reference suggests proof-of-concept exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None provided in references
Restart Required: Yes
Instructions:
1. Check vendor website for security updates. 2. Apply patch if available. 3. Restart Moo Chan Song service. 4. Verify fix by testing path traversal attempts.
🔧 Temporary Workarounds
Restrict File Write Permissions
linuxLimit the directories where Moo Chan Song can write files using OS-level permissions.
chmod 750 /path/to/moochan/data
chown moochan:restricted_group /path/to/moochan/data
Implement Input Validation
allAdd path traversal validation in web server or application firewall configuration.
# Example nginx location block with path validation
location ~ "\.\./" { deny all; }
🧯 If You Can't Patch
- Upgrade to a newer version if available, or migrate to alternative software.
- Implement strict network segmentation and limit access to Moo Chan Song to trusted sources only.
🔍 How to Verify
Check if Vulnerable:
Check if Moo Chan Song version is 4.5.7. Attempt to write a test file using path traversal payloads like '../../test.txt'.Check Version:
Check application configuration files or use 'moochan --version' if available.Verify Fix Applied:
After applying workarounds or patch, retest path traversal attempts and verify they are blocked. Monitor file system for unauthorized writes.📡 Detection & Monitoring
Log Indicators:
- Unusual file write patterns in application logs
- Multiple failed path traversal attempts
- Disk space alerts from monitoring systems
Network Indicators:
- HTTP requests containing '../' patterns
- Abnormal traffic to file upload endpoints
SIEM Query:
source="moochan.log" AND ("../" OR "..\\" OR "%2e%2e%2f")