CVE-2025-36938

# CVE-2025-36938 PoC - Fault Injection on U-Boot append_uint32_le() # This is a conceptual demonstration, actual exploitation requires physical access import struct def append_uint32_le(buffer, value): """ Original U-Boot append_uint32_le() implementation Simulates the vulnerable function behavior """ # Vulnerable: No fault injection protection encoded = struct.pack('<I', value & 0xFFFFFFFF) return buffer + encoded def simulate_fault_injection(buffer, value): """ Simulate fault injection attack scenario In real attack, physical methods (voltage glitching, EM fault injection) would be used to corrupt the execution """ print("[*] Simulating fault injection attack...") print(f"[*] Original value to append: {value}") # In real attack, fault injection could: # 1. Skip the bounds check # 2. Corrupt the value being written # 3. Skip the write entirely # 4. Write to wrong memory location # Simulate corrupted write (fault injection effect) corrupted_value = 0xFFFFFFFF # Max uint32, could bypass security checks result = append_uint32_le(buffer, corrupted_value) print(f"[*] Value after fault injection: {corrupted_value}") print(f"[*] Result buffer length: {len(result)} bytes") return result def demonstrate_attack(): """ Demonstrate the vulnerability exploitation path """ print("=" * 60) print("CVE-2025-36938 - U-Boot Fault Injection PoC") print("=" * 60) # Simulate buffer that might contain security-critical data buffer = b'\x00' * 100 target_value = 0x12345678 print(f"\n[*] Initial buffer size: {len(buffer)}") print(f"[*] Target value: 0x{target_value:08X}") # Normal execution normal_result = append_uint32_le(buffer, target_value) print(f"\n[+] Normal execution result: {normal_result[:20].hex()}") # Fault injection scenario faulted_result = simulate_fault_injection(buffer, target_value) print(f"\n[!] Fault injection result: {faulted_result[:20].hex()}") print("\n[*] Attack requires:") print(" 1. Physical access to target device") print(" 2. Fault injection equipment (FPGA-based glitcher, etc.)") print(" 3. Precise timing control during bootloader execution") print(" 4. Understanding of U-Boot execution flow") print("\n[*] Mitigation: Implement fault injection countermeasures in U-Boot code") if __name__ == "__main__": demonstrate_attack()

{"cve": {"id": "CVE-2025-36938", "sourceIdentifier": "[email protected]", "published": "2025-12-11T20:15:58.357", "lastModified": "2026-03-11T16:16:20.010", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "In U-Boot of append_uint32_le(), there is a possible fault injection due to a logic error in the code. This could lead to physical escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.8, "baseSeverity": "MEDIUM", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-693"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:google:android:-:*:*:*:*:*:*:*", "matchCriteriaId": "F8B9FEC8-73B6-43B8-B24E-1F7C20D91D26"}]}]}], "references": [{"url": "https://source.android.com/security/bulletin/pixel/2025-12-01", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://source.android.com/docs/security/bulletin/pixel/2026/2026-03-01", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}