Broadcast Signal Intrusion - Hacking Radio Stations

BROADCAST
SIGNAL
INTRUSION
Hacking radio stations
(ɔ) 2023

Gjoko Krstic
• Founder of Zero Science Lab2
• Offensive security research lead at ING
• Member of g00g00tka group
• Cybernetics student ☺
2

AGENDA
• Introduction
• Radio Station Components
• Broadcast Signal Intrusion
• ZSL Method
• Conclusion
• End of Transmission
3

4
Guglielmo Marconi, an Italian inventor and
electrical engineer, is credited with the invention
of the radio in 1894 and demonstrated in 1895.
He continued to develop and improve his system,
and in 1901 he successfully transmitted the first
transatlantic radio signal.
Alexander Graham Bell, an American inventor,
scientist, and teacher of the deaf, is also
considered one of the pioneers of radio
technology. He developed an early version of the
radio, which he called the "photophone," that
used light waves to transmit sound.
BRIEF HISTORY

5
BROADCAST TYPES
STREAMING/WEB TRADITIONAL AM/FM SATELLITE/DAB
Internet radio, which allows
listeners to stream audio
over the internet.
AM (Amplitude Modulation)
radio, which is the traditional
type of radio broadcasting and
uses variations in the amplitude
(or strength) of a radio wave to
transmit sound.
FM (Frequency Modulation)
radio, which uses variations in
the frequency of a radio wave
to transmit sound. FM radio
generally provides better sound
quality than AM radio.
Satellite radio, which is a
subscription-based service
that uses a network of
satellites to transmit radio
signals.
HD Radio, which is a digital
technology that allows FM
and AM stations to
broadcast additional
channels and data
alongside their traditional
analog signals.

1. MICROPHONE OR AUDIO SOURCE: THIS IS WHERE THE AUDIO CONTENT ORIGINATES, IT
COULD BE A LIVE SHOW, PRE-RECORDED CONTENT, OR A STREAMING SERVICE.
2. AUDIO PROCESSOR: THIS DEVICE IS RESPONSIBLE FOR PROCESSING THE AUDIO
SIGNALS, SUCH AS ADJUSTING THE VOLUME, EQUALIZATION, AND COMPRES SION.
3. MODULATOR: THIS DEVICE IS RESPONSIBLE FOR MODULATING THE AUDIO SIGNALS
ONTO A CARRIER FREQUENCY USING TECHNIQUES SUCH AS FM OR AM.
4. TRANSMITTER: THIS DEVICE AMPLIFIES THE MODULATED SIGNAL AND TRANSMITS IT
VIA AN ANTENNA.
5. ANTENNA: THIS DEVICE IS USED TO RADIATE THE RADIO WAVES INTO THE AIR.
6. RECEIVER: THIS IS THE DEVICE THAT RECEIVES THE RADIO WAVES AND DEMODULATE S
THEM TO EXTRACT THE ORIGINAL AUDIO SIGNALS. THIS CAN BE A STANDA LONE RADIO
RECEIVER OR A BUILT-IN RECEIVER IN A CAR, SMARTPHONE, OR OTHER DEVICE.
7. AUDIO AMPLIFIER AND SPEAKERS: THIS DEVICE AMPLIFIES THE AUDIO SIGNAL AND
PLAYS THE SOUND VIA SPEAKERS.
6
TYPICAL RADIO COMPONENTS

10
ANALOG DIGITAL
FM TRANSMITTERS

BROADCAST SIGNAL INTRUSION
Broadcast signal intrusion is the unauthorized alteration
or takeover of a broadcast signal. This can occur on
television or radio broadcasts and can take many forms.
Digital intrusion is more sophisticated and can include
hacking into a station's computer systems to gain
control of the signal, or intercepting and modifying the
signal as it is being transmitted.
16

27
WHAT IS DAB?
WHAT IS RDS?
DAB (Digital Audio Broadcasting) is a digital radio standard that uses a different
modulation method compared to FM and AM. DAB uses a technique called
COFDM (Coded Orthogonal Frequency-Division Multiplexing) to modulate the
audio signals onto a carrier frequency. DAB also can transmit additional data,
such as station information, song titles and traffic reports, but it uses a different
method to transmit this data, it uses the DAB EPG (Electronic Program Guide)
that allows for the transmission of more advanced information than RDS.
RDS (Radio Data System) is a technology that is primarily used for FM radio, it
allows for the transmission of additional data, such as song titles, station
information, and traffic reports, over FM radio waves.

Case #13 – Adtec Digital
Digital Video Broadcasting (DVB)

Flexible and powerful, it ensures perfect sound
quality and full compatibility with radio
broadcasting standards and can be used
simultaneously for FM and HD, DAB, DRM or
streaming.
29
RADIO PROCESSING

Many audio processors and other IoT
devices come with built-in web
interfaces or APIs that allow for
remote management and control, and
software such as "Remote Control"
can be used to access these
interfaces. This can be useful for
adjusting settings, monitoring the
performance of the equipment, and
troubleshooting problems remotely.

VECTORS [BLACKBOX]
• The network-connected device
- Web interface (PHP, CGI, Shell scripts), HTTP
- Telnet: Link&Share terminal server
- ELF32 binaries (Linux/ARM)
- Firmware?
• The software (thick client), Windows 10
- SOUND4 Server.exe (64bit)
- SOUND4 Remote Control.exe (32bit)
- LinkAndShare Transmitter.exe (32bit)
32

INVESTIGATION
• DuckDuckGo, Documentation, OpenAI, YouTube
• Penetration test
-> Manual analysis + scan/map
• Coverage-guided fuzzing
• Source code review
• OSINT + exposure
-> Shodan, BinaryEdge
33

RESULTS
• 25 0-days and counting 
• 107 radio stations affected
• No response from the vendor(s) 
• Collab with national CERTs and VINCE (CISA)
• CVEs pending… but we don’t care about that
35

36
FORMAT STRING IN USERNAME ENV
(LinkAndShareTransmitter.exe)

37
> set username=AAAA_%x_%x_%x_%x_BBBB_%p_%p_%p_%p_CCCC_%n
> echo %username%
> AAAA_%x_%x_%x_%x_BBBB_%p_%p_%p_%p_CCCC_%n

38
> set username=AAAA_%x_%x_%x_%x_BBBB_%p_%p_%p_%p_CCCC_%n
> echo %username%
> AAAA_%x_%x_%x_%x_BBBB_%p_%p_%p_%p_CCCC_%n

40
JACKALOPE + WINAFL
SOUND4 Remote Control.exe (vc_s4client.dll)

41
MAIN INTERFACE
SOUND4 Remote Control.exe

42
MAIN INTERFACE
SOUND4 Remote Control.exe

50
INTERNET
STREAMING
IP CONNECT

NEWS FLASH FROM THE AI
WHAT IF THE AUDIO PROCESSOR AS AN IOT DEVICE GETS HACKED, CAN TH E
HACKER TAKE OVER A BROADCAST SIGNAL ?
“If an audio processor is hacked, it is possible that the hacker could
take over the broadcast signal. Depending on the specific device and
the level of access gained by the hacker, they could potentially modify
the audio content, disrupt the transmission, or even gain control over
the entire broadcast system.
However, it's important to note that these kind of hacks are not easy to
carry out and would require a high level of technical knowledge and
skill. Additionally, most IoT devices have some form of security
measures in place to prevent unauthorized access, such as firewalls,
encryption and authentication.”
51

…
if (isset($_POST['username']) && isset($_POST['password'])) {
$ret = -1;
exec('echo ' . $_POST['password'] . ' | /opt/sound4/sound4server
_check_pwd_ ' .'"'.$_POST['username'].'";',$out,$ret);
…
52
FIRMWARE GLIMPSE: WEB GI
(login.php)

VULNERABILITIES!
Privilege Escalation
Cross-Site Request Forgery
Authorization Bypass
Denial of Service
Authentication Bypass
ICMP Flood Attack
Information Disclosure
Command Injection
SQL Injection
Cross-Site Scripting
Directory Traversal
Pre-auth Factory Reset
Stack-based Buffer Overflow
Default Credentials
Hard-coded Credentials
Cleartext Storage and Communication
Vulnerable Libraries/Binaries
Broadcast Signal Hijacking

55
JUST ANOTHER SHOUTOUT
• Radio and broadcast signal intrusion is a serious security
concern that can disrupt communications and cause
confusion and panic among the public.
• Security is often overlooked in the radio and
broadcast industry, leaving exposed devices and
components online and vulnerable to attack.
• IoT vendors need to have more awareness about
security and include security in their software
development life cycle (SDLC) pipeline to
prevent vulnerabilities from being introduced in
their products.

THANK YOU
HEK.SI - 2023
@zeroscience
www.zeroscience.mk
56

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