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MailDepot 2033 2.3.3022 Cross Site Scripting

MailDepot 2033 2.3.3022 Cross Site Scripting
Posted Nov 16, 2020
Authored by Micha Borrmann, Thomas Engel | Site syss.de

MailDepot version 2033 (2.3.3022) suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2020-26554
MD5 | 1fd4f4c962bf56df0c1ae99d3b9409e2

MailDepot 2033 2.3.3022 Cross Site Scripting

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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Advisory ID: SYSS-2020-037
Product: MailDepot
Manufacturer: REDDOXX GmbH
Affected Version(s): 2033 (2.3.3022)
Tested Version(s): 2033 (2.3.3022)
Vulnerability Type: Persistent Cross-site Scripting (CWE-79)
Risk Level: High
Solution Status: Open
Manufacturer Notification: 2020-10-01
Solution Date: 2020-11-11
Public Disclosure: 2020-11-13
CVE Reference: CVE-2020-26554
Authors of Advisory: Micha Borrmann, Thomas Engel (SySS GmbH)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Overview:

REDDOXX MailDepot is an e-mail archiving solution with many features
and an optional web browser user interface.

The manufacturer describes the product as follows (see [1]):

"The email archiving solution works independently from the type of
mail server, supports any type of storage and can therefore be easily
integrated into any existing infrastructure."

Due to the improper server-side invalidation of authentication tokens
when using the logout function, authentication tokens can still be
used.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Vulnerability Details:

The web-based application displays the entire content of HTML e-mails.
Also, external resources like images or JavaScript will be executed
during the display of an e-mail. In addition, the subject field is not
sanitized and allows the injection of JavaScript code which will be
executed when an e-mail is displayed.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Proof of Concept (PoC):

There are a lot of tools that generate HTML mails including JavaScript.

The following part in an HTML e-mail illustrates the security issue:

<img src="https://www.example.org/xss.png">
<script>alert("XSS Demonstration")</script>
<script src="https://www.example.org/xss.js"></script>

The subject of an e-mail may contain the following code which will be
executed when the e-mail is viewed:

<img src=X onerror='alert("XSS Demonstration")'</script>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution:

Install the provided hotfix 43-restproxy-usergui [2]

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclosure Timeline:

2020-09-30: Detection of the vulnerability
2020-10-01: Vulnerability reported to manufacturer
2020-10-04: CVE number assigned
2020-10-05: Manufacturer confirms vulnerability
2020-11-11: Hotfix was released by the vendor
2020-11-13: Public release of the security advisory

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

References:

[1] REDDOXX MailDepot Product Website
https://www.reddoxx.com/en/products/archiving/
[2] REDDOXX Release Notes
https://appliance.docs.reddoxx.com/de/release-notes/release-notes-version-2033-final-2-3-3022
[3] SySS Security Advisory SYSS-2020-037
https://www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2020-037.txt
[4] SySS Responsible Disclosure Policy
https://www.syss.de/en/responsible-disclosure-policy/

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Credits:

This security vulnerability was found by Micha Borrmann and Thomas
Engel of SySS GmbH.

E-Mail: micha.borrmann (at) syss.de
Public Key: https://www.syss.de/fileadmin/dokumente/PGPKeys/Micha_Borrmann.asc
Key Fingerprint: 38BD 7A9C 3EA9 39C5 33F9 94D0 CFC2 D5B0 8EE0 CBB9

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Disclaimer:

The information provided in this security advisory is provided "as is"
and without warranty of any kind. Details of this security advisory
may be updated in order to provide as accurate information as
possible. The latest version of this security advisory is available on
the SySS website.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Copyright:

Creative Commons - Attribution (by) - Version 3.0
URL: http://creativecommons.org/licenses/by/3.0/deed.en
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