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Teltonika Gateway TRB245 Stored Cross-site Scripting

Low

Synopsis

A stored cross-site scripting vulnerability exists in the Web UI. A remote, authenticated attacker is able to inject malicious client-side code into the 'URL/ Host / Connection' form in the 'DATA TO SERVER' configuration section. An attacker with low privileges could exploit this to steal session details from a higher privileged user.

Proof of Concept

In the below screenshot we can see the tester has added some script tags into the 'URL/ Host / Connection' form.

“<script>alert(‘1337 hacks’)</script>

When the tester selects ‘Save & Apply’ this change you will be redirected to the list of data sensors and the injected javascript will execute.

Solution

Upgrade to TRB2_R_00.02.03 or newer.

Disclosure Timeline

07/01/2020 - Tenable attempts to find security contact.
07/07/2020 - Tenable uses Contact Us web form to ask for security contact email address. We cannot report through the vulnerability reporting web page.
07/08/2020 - Teltonika responds. Says we can send the report via email.
07/08/2020 - Tenable sends the report. 90-day date is 10/06/2020.
07/09/2020 - Teltonika thanks us for the report. They will investigate and follow up with us. They do ask us for a PoC as well.
07/09/2020 - Teltonika responds with their initial assessment.
07/09/2020 - Tenable thanks Teltonika for the update. Sends PoC over.
07/10/2020 - Teltonika cannot reproduce XSS on the newest firmware TRB2_R_00.02.04.
07/10/2020 - Tenable asks if XSS was confirmed to exist in TRB2_R_00.02.02 firmware.
07/14/2020 - Teltonika can reproduce the vulnerability in TRB2_R_00.02.02 firmware.
07/14/2020 - Since the vulnerability was confirmed in a previous version, Tenable will plan to assign a CVE and release an advisory. Asks if a CVE has already been assigned and which version corrected the issue.
07/16/2020 - Teltonika says they did not assign a CVE. Fix version is TRB2_R_00.02.03.
07/16/2020 - We will publish the XSS as CVE-2020-5769 and send a link to the advisory after it is published.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

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