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How CVE-2025-4341 Works
The vulnerability exists in the `sub_16570` function within `/htdocs/ssdpcgi` which handles SSDP (Simple Service Discovery Protocol) requests. The function improperly sanitizes user-supplied input from HTTP headers including HTTP_ST, REMOTE_ADDR, REMOTE_PORT, and SERVER_ID. An attacker can craft malicious HTTP requests containing OS commands in these headers, which are then executed with root privileges due to insufficient input validation. The vulnerability is remotely exploitable without authentication, allowing attackers to gain complete control of affected devices. The root cause is the lack of proper sanitization before passing user input to system() calls.
DailyCVE Form
Platform: D-Link DIR-880L
Version: <= 104WWb01
Vulnerability: Command Injection
Severity: Critical
Date: 2025-05-06
What Undercode Say:
Exploitation POC
curl -H "REMOTE_ADDR: `id > /tmp/pwned`" http://target/ssdpcgi
nc -lvnp 4444 -e /bin/sh
Detection Command
strings /htdocs/ssdpcgi | grep system(
grep -r "system(" /htdocs/
Mitigation Steps
1. Disable WAN access to admin interface
2. Apply input validation filters:
sed -i 's/system(/safe_system(/g' /htdocs/ssdpcgi
3. Implement firmware patch:
wget https://patches.dlink.com/DIR880L/secure_cgi.patch
patch -p1 < secure_cgi.patch
Forensic Analysis
cat /var/log/messages | grep ssdpcgi
hexdump -C /htdocs/ssdpcgi | grep -A10 system
Network Protection
iptables -A INPUT -p tcp --dport 1900 -j DROP
iptables -A INPUT -p udp --dport 1900 -j DROP
Memory Protection
echo 1 > /proc/sys/kernel/randomize_va_space
ulimit -c 0
Permanent Fix
rm /htdocs/ssdpcgi
chattr +i /htdocs/
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
