EuroTel ETL3100 Transmitter Authorization Bypass (IDOR)

Vendor: EuroTel S.p.A. | SIEL, Sistemi Elettronici S.R.L
Product web page: https://www.eurotel.it | https://www.siel.fm
Affected version: v01c01 (Microprocessor: socs0t10/ats01s01, Model: ETL3100 Exciter) 
                  v01x37 (Microprocessor: socs0t08/socs0s08, Model: ETL3100RT Exciter)


Summary: RF Technology For Television Broadcasting Applications.
The Series ETL3100 Radio Transmitter provides all the necessary
features defined by the FM and DAB standards. Two bands are provided
to easily complain with analog and digital DAB standard. The Series
ETL3100 Television Transmitter provides all the necessary features
defined by the DVB-T, DVB-H, DVB-T2, ATSC and ISDB-T standards, as
well as the analog TV standards. Three band are provided to easily
complain with all standard channels, and switch softly from analog-TV
'world' to DVB-T/H, DVB-T2, ATSC or ISDB-T transmission.

Desc: The application is vulnerable to insecure direct object references
that occur when the application provides direct access to objects based
on user-supplied input. As a result of this vulnerability attackers can
bypass authorization and access the hidden resources on the system and
execute privileged functionalities.

Tested on: GNU/Linux Ubuntu 3.0.0+ (GCC 4.3.3)
           lighttpd/1.4.26
           PHP/5.4.3
           Xilinx Virtex Machine


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2023-5783
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5783.php


29.04.2023

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