MailDepot 2033 2.3.3022 Cross Site Scripting

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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)  
  
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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.  
  
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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.  
  
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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>  
  
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Solution:  
  
Install the provided hotfix 43-restproxy-usergui [2]  
  
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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  
  
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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/  
  
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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  
  
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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.  
  
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Copyright:  
  
Creative Commons - Attribution (by) - Version 3.0  
URL: http://creativecommons.org/licenses/by/3.0/deed.en  
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