A new side-channel attack method [1] [2], known as PIXHELL, has recently been discovered. This attack targets air-gapped computers by exploiting the “audio gap” to exfiltrate sensitive information using the noise generated by pixel patterns on LCD screens [1].
Description
This attack leverages the screen’s acoustic signals to transmit data covertly, without the need for specialized audio hardware. By manipulating pixel patterns on the screen [1] [2], attackers can create acoustic signals at specific frequencies to leak information from audio-gapped systems. The power and quality of the acoustic signal depend on the screen’s structure and internal components [1]. Advanced versions of the attack use low-brightness pixel patterns to remain undetected [2]. Countermeasures against PIXHELL include using acoustic jammers [2], monitoring the audio spectrum for unusual signals [1], limiting physical access to air-gapped systems [2], and implementing hardware modifications to prevent sound emissions [2].
Conclusion
The discovery of PIXHELL highlights the vulnerability of air-gapped systems to unconventional attacks [2]. It underscores the importance of comprehensive security measures beyond traditional network and software protections [2]. Moving forward, it is crucial for organizations to stay vigilant and implement robust security protocols to safeguard against emerging threats like PIXHELL.
References
[1] https://thehackernews.com/2024/09/new-pixhell-attack-exploits-screen.html
[2] https://itinnovationstation.com/2024/09/10/from-pixels-to-soundwaves-the-pixhell-attack-on-air-gapped-computers/
