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It’s reasonably clear that the chip shown in the article is very unlikely to be any kind of microcontroller/semiconductor. It’s embedded in ceramic. Such devic
by xevb3k 8y ago
It’s reasonably clear that the chip shown in the article is very unlikely to be any kind of microcontroller/semiconductor.
It’s embedded in ceramic. Such devices need to be fired at very high temperatures which a semiconductor wouldn’t be able to withstand.
- ohazi 8y agoYou can make two half ceramic pieces and cement them together nearly seamlessly with a semiconductor inside. This was common before DIP packages.
- ethbro 8y agoI was going to say, the number of ways to make something look like a ceramic component are more relevant.
- CamperBob2 8y agoIn any case, someone who can make a malicious IC die look like a balun could just as easily add their die to the EEPROM package that's intended to be there. It makes no sense for state-level bad guys to create disguised packages and add them to boards at the assembly house. There are any number of other links in the supply chain where they could accomplish the same goal with an actual nonzero chance of getting away with it.
- sjwright 8y agoThe key benefit of injecting at the assembly house is that it means you can target the injections based on the final customer. This reduces the footprint of the attack, which reduces the chances of your exploit being publicly exposed, and reduces the risks inherent in scaling up a highly specialised top secret supply chain.
- solarkraft 8y agoYou're arguing against compromising the boards, right?
- sjwright 8y agoNo. I'm pointing out an advantage in putting the exploit into the supply chain as late as possible, such that it can be selected for based on customer. Compromising the motherboard may be a good approach if the boards have some amount of customisation for each customer.
- xevb3k 8y agoNo it wasn’t? They used to use gold caps. You could absolutely use a novel manufacturing technique to make something that looks like the picture in the article. It wouldn’t make much sense to do so, because that part doesn’t even belong on a computer motherboard, it’s an RF component.
- ohazi 8y agoPlenty that had solid tops? https://www.dhresource.com/0x0s/f2-albu-g5-M01-4D-13-rBVaJFlc1qOAMJANAAJKInKan14231.jpg/zilog-z0840004dsa-z80-cpu-dual-in-line-40.jpg https://www.dhresource.com/0x0s/f2-albu-g5-M01-4D-13-rBVaJFl...
- xevb3k 8y agoThat’s fair enough, I don’t think that process would work here though? I also don’t understand why you would do that. Given the ceramic part in question doesn’t look like anything that would be on a motherboard, and has been identified as an RF component.