RRX IOB LP 1.0 DNS Cache Snooping

CVE Category Price Severity
CVE-2021-12345 CWE-200 $500 High
Author Risk Exploitation Type Date
SecurityResearcherX High Remote 2022-10-17
Our sensors found this exploit at:

Below is a copy:

RRX IOB LP 1.0 DNS Cache Snooping
Document Title:
RRX IOB LP v1.0 - DNS Cache Snooping Vulnerability

References (Source):


Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:

Current Estimated Price:
2.000 - 3.000

Product & Service Introduction:
This product, solution or service ("Product") contains third-party software components listed in this document. These components are Open Source
Software licensed under a license approved by the Open Source Initiative ( or similar licenses as determined by SIEMENS ("OSS")
and/or commercial or freeware software components. With respect to the OSS components, the applicable OSS license conditions prevail over any other
terms and conditions covering the Product. The OSS portions of this Product are provided royalty-free and can be used at no charge.

If SIEMENS has combined or linked certain components of the Product with/to OSS components licensed under the GNU LGPL version 2 or later as per the
definition of the applicable license, and if use of the corresponding object file is not unrestricted ("LGPL Licensed Module", whereas the LGPL
Licensed Module and the components that the LGPL Licensed Module is combined with or linked to is the "Combined Product"), the following additional
rights apply, if the relevant LGPL license criteria are met: (i) you are entitled to modify the Combined Product for your own use, including but not
limited to the right to modify the Combined Product to relink modified versions of the LGPL Licensed Module, and (ii) you may reverse-engineer the
Combined Product, but only to debug your modifications. The modification right does not include the right to distribute such modifications and you
shall maintain in confidence any information resulting from such reverse-engineering of a Combined Product.

Certain OSS licenses require SIEMENS to make source code available, for example, the GNU General Public License, the GNU Lesser General Public License
and the Mozilla Public License. If such licenses are applicable and this Product is not shipped with the required source code, a copy of this source
code can be obtained by anyone in receipt of this information during the period required by the applicable OSS licenses by contacting the following address.

Abstract Advisory Information:
The vulnerability laboratory core research team discovered a dns snooping vulnerability in the Rhein Ruhr Express (RRX IOB Landing Page 1.0 - Open Source Software) with Hotspot Siemens Portal.

Vulnerability Disclosure Timeline:
2020-08-03: Researcher Notification & Coordination (Security Researcher)
2020-08-04: Vendor Notification (Security Department)
2020-08-27: Vendor Response/Feedback #1 (Security Department)
2020-11-10: Vendor Response/Feedback #2 (Security Department)
2021-01-30: Security Acknowledgements (Security Department)
2022-10-09: Vendor Fix/Patch by Check (Service Developer Team)
2022-10-11: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

Authentication Type:
Restricted Authentication (Guest Privileges)

User Interaction:
No User Interaction

Disclosure Type:
Responsible Disclosure

Technical Details & Description:
A dns cache snooping vulnerability has been discovered in the official Rhein Ruhr Express (RRX IOB Landing Page 1.0 - Open Source Software) with Hotspot Siemens Portal.
The vulnerability allows remote attackers to determine resolved sites and name servers to followup with manipulative interactions.

The vulnerability allows remote attackers to determine which domains have recently been resolved via this name server, and therefore which hosts have been recently visited.
For instance, if an attacker was interested in whether your company utilizes the online services of a particular financial institution, they would be able to use this attack
to build a statistical model regarding company usage of that financial institution. Of course, the attack can also be usead to find B2B partners, web-surfing patterns, external
mail servers, and more. If this is an internal DNS server not accessible to outside networks, attacks would be limited to the internal network. This may include employees,
consultants and potentially users on a guest network or WiFi connection if supported.

Proof of Concept (PoC):
The dns cache snooping vulnerability can be exploited by remote attackers with wifi guest access without user interaction or privileged user account.
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

--- PoC Session Logs ---
Sent a non-recursive query for
and received 1 answer: dnsmasq-2.75

53 / udp / dns

Solution - Fix & Patch:
Improve the cache management via dns to ensure no manipulations can take place.
Contact the manufacturer siemens to resolve the issue by an automated or manual patch.
2022-10-09: Vendor Fix/Patch by Check (Service Developer Team)
The patching process will be delivered by siemens during train maintenance and will take at least until 2022 Q2-Q3 to be rolled out on all trains (40+).

Security Risk:
The security risk of the web vulnerability in the siemens hotspot rxx wifi is estimated as medium.

Credits & Authors:
Vulnerability-Lab [Research Team] -

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