CVE-2025-13771
📋 TL;DR
CVE-2025-13771 is an arbitrary file read vulnerability in WebITR software developed by Uniong. Authenticated remote attackers can exploit relative path traversal to download arbitrary system files from the server. Organizations using vulnerable versions of WebITR are affected.
💻 Affected Systems
- WebITR
📦 What is this software?
Webitr by Uniong
⚠️ Risk & Real-World Impact
Worst Case
Attackers could read sensitive system files including configuration files, password files, SSH keys, database credentials, and other critical data, potentially leading to full system compromise.
Likely Case
Attackers with authenticated access can exfiltrate sensitive configuration files and credentials stored on the server, enabling lateral movement and privilege escalation.
If Mitigated
With proper network segmentation, strong authentication controls, and file system permissions, impact is limited to files accessible by the WebITR process user.
🎯 Exploit Status
Exploitation requires authenticated access but uses simple path traversal techniques. Attackers can craft malicious requests to traverse directories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10539-21f45-2.html
Restart Required: Yes
Instructions:
1. Contact Uniong for the latest patched version of WebITR. 2. Backup current configuration and data. 3. Apply the security update. 4. Restart the WebITR service. 5. Verify the fix is applied.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation to block path traversal sequences in file download requests
Web Application Firewall Rules
allDeploy WAF rules to detect and block path traversal patterns in HTTP requests
🧯 If You Can't Patch
- Implement strict network access controls to limit WebITR access to authorized users only
- Apply principle of least privilege to WebITR service account and restrict file system access
🔍 How to Verify
Check if Vulnerable:
Test authenticated file download functionality with path traversal payloads like '../../etc/passwd'Check Version:
Check WebITR version through web interface or configuration filesVerify Fix Applied:
Attempt the same path traversal attacks after patching to confirm they are blocked📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' sequences
- Multiple failed file access attempts
- Access to unusual file paths
Network Indicators:
- Unusual file download patterns
- Requests for system files from web application
SIEM Query:
web.url:*../* AND (web.url:*passwd* OR web.url:*shadow* OR web.url:*config*)