CVE-2025-7625
📋 TL;DR
This critical vulnerability in YiJiuSmile kkFileViewOfficeEdit allows remote attackers to perform path traversal attacks via the 'url' parameter in the /download endpoint. Attackers can potentially access sensitive files outside the intended directory. All users running affected versions of this software are at risk.
💻 Affected Systems
- YiJiuSmile kkFileViewOfficeEdit
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through arbitrary file read/write, potentially leading to sensitive data exposure, credential theft, or remote code execution.
Likely Case
Unauthorized access to sensitive configuration files, source code, or user data stored on the server.
If Mitigated
Limited impact with proper input validation and file system permissions restricting access to sensitive areas.
🎯 Exploit Status
Exploit details are publicly disclosed in GitHub issues, making weaponization straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit after 5fbc57c48e8fe6c1b91e0e7995e2d59615f37abd
Vendor Advisory: https://github.com/YiJiuSmile/kkFileViewOfficeEdit/issues/12
Restart Required: Yes
Instructions:
1. Pull latest code from repository 2. Rebuild application 3. Restart service 4. Verify fix by testing path traversal attempts
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation to block directory traversal sequences in URL parameter
Implement regex filter: if (url.contains("..") || url.contains("/")) { reject request }
Web Application Firewall Rule
allBlock requests containing path traversal patterns to /download endpoint
WAF rule: deny if request_uri contains "/download" and args contains ".." or "%2e%2e"
🧯 If You Can't Patch
- Implement strict file system permissions to limit accessible directories
- Deploy network segmentation to isolate vulnerable instances from sensitive systems
🔍 How to Verify
Check if Vulnerable:
Test by sending request to /download endpoint with traversal payload: GET /download?url=../../../etc/passwdCheck Version:
Check git commit hash: git log --oneline -1Verify Fix Applied:
Attempt same traversal payload; should receive error or sanitized response instead of file contents📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /download with '..' or encoded equivalents in parameters
- Unusual file access patterns from web server process
Network Indicators:
- Multiple failed traversal attempts
- Successful downloads of unexpected file types
SIEM Query:
source="web_logs" AND uri_path="/download" AND (query_string="*..*" OR query_string="*%2e%2e*")