The BadBIOS story from 2013, in which a Canadian researcher thought he might have discovered a strain of in-the-wild BIOS malware that could jump airgaps in a similar way.The Fansmitter: a way to use computer fan speed to exfiltrate data on you, also brought to us courtesy of Ben-Gurion University researchers.We’ve written about these attacks quite a lot, as we’ve seen: Instead, you listen in to the side effects it causes and figure out what’s going on indirectly. In other words, you don’t directly try to eavesdrop on the actual process or procedure that’s your target in a side-channel attack. They exploit a system’s physical parts – be they fans, LED lights, stray sounds, or WiFi emissions – as opposed to targeting a system by weaknesses in its algorithms or by brute force. This type of attack is called a side-channel attack. A camera installed on a drone that’s flown to a spot where it has line of sight with the front panel of the transmitting computer – such as near the window – can pick up data, though they said that this type of receiver is relevant for leaking a small amount of data, including encryption keys. The drone approach works, too, as the researchers showed. Hiding a camera internally would work, as would a camera carried by a malicious insider – as long as the receiving camera has a line of sight to the front panel of the transmitting, infected computer. As the researchers describe in their paper (PDF), such malware could be used to control a system’s hard disk drive’s LED, turning it off and on at a rate of up to 5,800 blinks per second: faster than human eyes can detect.įor air-gapped systems, that dirty work would have to be carried out by an insider: somebody who could infect a system with a USB or SD card, for example (I can’t help wondering if an attacker with that much accesses would need to resort to these kind of elaborate exfiltration tricks).Īfter the machine’s infected, there are a number of ways an attacker could pick up on the encoded LED blinks. Granted, for such an attack to work, the hackers would first need to infect a targeted system with malware. You can see their demonstration in this video: An air gap is a network security measure in which highly sensitive computers are physically isolated, kept away from both the public internet or from unsecured local area networks and the hackers who could get at their data. Also my cpu is a ryzen 1700 and the mobo is a gigabyte b450m s2h (updated to the lastest bios too).Researchers at Ben-Gurion University’s Negev Cyber Security Research Center this month demonstrated this type of espionage technique: one that can defeat an air gap. #SOPHOS POWER AND DISK LED BLINK DRIVERS#So, what's happening? Is my gpu defective? Or is my power supply? I'm inclined to think that there's some bug in the gpu drivers or bios (i've also updated my gpu bios to the last one). VDDC seemed fine, and the system was stable. #SOPHOS POWER AND DISK LED BLINK SOFTWARE#Watching the hwinfo monitoring software i've detected that when the led blinks the lectures from "GPU Core Current" and "GPU Core Power" went to 0.0. The system runned fine, but the led still blinked. At first i've thought that my psu was defective so swapped the power supply with an antec 500w. My computer has an ocz zs750w power supply (hwinfo 12v, 3.3v, 5.5v reads are fine). It even renders with blender cycles ok for several hours. The computer runs fine, it goes fine while gaming, it passes an hour of furmark stress test and 3dmark time spy. My card blinks sometimes (once every ten minutes) and while idling. No blink means "ok", always lit means "no power" and blinking means "abnormal power supply". It's a feature that alerts the user when the card suffers power issues. I've got a gigabyte rx580 graphics card that has a white led just at the top of the pcie conector.
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