How CVE-2025-25783 Works
The vulnerability exists in `admin/plugin.php` of Emlog Pro v2.5.3 due to insufficient validation during plugin uploads. Attackers can craft a malicious ZIP file containing a PHP webshell and upload it via the plugin installation feature. The server extracts the ZIP without proper file extension checks, allowing arbitrary code execution when the uploaded file is accessed. The attack requires admin privileges but can lead to full system compromise if exploited.
DailyCVE Form:
Platform: Emlog Pro
Version: 2.5.3
Vulnerability: Arbitrary File Upload
Severity: Critical
Date: 2025-04-07
What Undercode Say:
Exploitation:
- Craft a ZIP containing `shell.php` with malicious payload:
zip exploit.zip shell.php
2. Upload via Emlog’s plugin interface:
POST /admin/plugin.php?action=upload HTTP/1.1 Content-Type: multipart/form-data File: exploit.zip
Detection:
Check server logs for suspicious ZIP uploads:
grep -r "plugin.php?action=upload" /var/log/nginx/access.log
Mitigation:
1. Patch to Emlog Pro v2.5.4+.
2. Restrict plugin uploads to trusted users:
// Add file extension validation in plugin.php
$allowed_ext = ['zip'];
if (!in_array($file_ext, $allowed_ext)) { die("Invalid file"); }
3. Use web application firewall (WAF) rules:
location ~ /admin/plugin.php {
deny all;
}
Post-Exploit Analysis:
Locate uploaded shells:
find /var/www/html -name ".php" -mtime -1
Indicators of Compromise (IoC):
- Unauthorized `plugin.php` POST requests.
- New PHP files in
/content/plugins/.
References:
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-25783
Extra Source Hub:
Undercode
