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How CVE-2025-4342 Works
This vulnerability exploits a buffer overflow in the `formEasySetupWizard3` function of D-Link DIR-600L firmware (up to v2.07B01). The flaw occurs due to insufficient bounds checking when processing the `host` parameter, allowing an attacker to overwrite adjacent memory regions. Remote exploitation is possible by sending a crafted HTTP request containing an excessively long `host` value, leading to arbitrary code execution or device crash. Since the device is unsupported, no patches are available.
DailyCVE Form
Platform: D-Link DIR-600L
Version: ≤ 2.07B01
Vulnerability: Buffer Overflow
Severity: Critical
Date: 2025-05-13
What Undercode Say:
Exploitation
1. Craft malicious HTTP request:
curl -X POST http://<TARGET_IP>/formEasySetupWizard3 -d "host=$(python -c 'print("A"500)')"
2. Metasploit module (hypothetical):
exploit/unix/http/dlink_dir600l_buffer_overflow
Detection
1. Check firmware version:
grep "FW_VERSION" /etc/version
2. Log analysis for overflow attempts:
grep -i "formEasySetupWizard3" /var/log/httpd.log
Mitigation
1. Network segmentation:
iptables -A INPUT -p tcp --dport 80 -j DROP
2. Disable web interface:
/etc/init.d/httpd stop
Memory Analysis
1. Crash dump examination:
gdb -c /tmp/coredump /usr/sbin/httpd
2. Stack trace:
bt full
References
- VulDB: CVE-2025-4342
- NVD: NIST Entry
Firmware Diff
- strcpy(host, input); + strncpy(host, input, MAX_LEN);
No official patch available. Recommended action: Replace unsupported hardware.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
