5 ms·
EEPROM - Electronically Erasable Read Only Memory It's re-programmable (i.e. by re-flashing it). edit: I should add that motherboard manufacturers could prev
by FlyingAvatar 13y ago
EEPROM -
Electronically Erasable Read Only Memory
It's re-programmable (i.e. by re-flashing it).
edit: I should add that motherboard manufacturers could prevent this type of attack by "locking" the BIOS for flashing unless it was explicitly unlocked by changing a setting in the BIOS menu (some have this already, I believe). The problem at the moment is that the BIOS is writable at all times, even when the OS is running. This makes BIOS updates easier (i.e. you can make a Windows application that can do so, for example), but the problem is that this allows ANY process with Admin access to alter the BIOS as well.
- sillysaurus2 13y agoThe problem at the moment is that the BIOS is writable at all times, even when the OS is running. This makes BIOS updates easier (i.e. you can make a Windows application that can do so, for example), but the problem is that this allows ANY process with Admin access to alter the BIOS as well. I'm speechless that this horrible idea was ever taken seriously, much less implemented. That answers my question as to how a BIOS could become infected. I'm seriously sitting here in shock. How could any hardware manufacturer think it was a good idea to let a userspace program permanently alter EEPROM, ever? One does not need to be very intelligent to realize hackers will hack that. This brings us full circle to the original question, though: Did the security researcher write a program to dump the contents of EEPROM rather than desoldering the chips? if so, then he may have been hoodwinked by the virus.
- fleitz 13y ago> How could any hardware manufacturer think it was a good idea to let a userspace program permanently alter EEPROM, ever? Because most hardware manufactures are selling to consumers and not cypherpunks.
- stephengillie 13y agoThis brings us full circle to the original question, though: Did the security researcher write a program to dump the contents of EEPROM rather than desoldering the chips? if so, then he may have been hoodwinked by the virus. Is this different than getting a dump of the BIOS before flashing it? Are we talking about different chips on the motherboard?
- astrobe_ 13y agoFlashing BIOS used to require a hardware manipulation - like moving a jumper or a dip switch. I hope this is still the case?
- anonymfus 13y agoSecureBoot implies that firmware installed by running OS must be signed too.
- Someone 13y agoThat may not work if your Secureboot implementation is buggy. The '80s solution to this problem was way easier, and it worked: a switch on the motherboard required physical access to the machine to flash its firmware.
- alextingle 13y agoPhysical switches are expensive.
- nitrogen 13y agoJumpers are not expensive. You've already got dozens of the same kind of pin inside of every classic IDE and floppy connector on a motherboard.