this post was submitted on 18 Dec 2024
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An even better way is to leave vulnerable pieces in all parts of the firmware / software stack. E.g. old version of SSH with a known vulnerability or two, old web server, etc. Then just exploit as needed.
The examples you gave are all at the OS level and installing OpenWRT would fix them. The firmware/BIOS level is much more custom and can be susceptible to attacks the OS is completely unaware of (effectively pre-installed rootkits). Hence why I mentioned it may not be enough to install OpenWRT.
You are talking about the boot loader, but even that is pretty standard. There could be hardware exploits in place, sure, but we are mostly talking about a very low margin product and the volume of data that you'd need to retrieve and process to sift out anything useful would be massive and obvious so in general I think this is mostly conspiracy level thinking. Any shenanigans is going to be done in small targeted batches if it's done at all to try to infiltrate specific targets and reduce risk of some curious researcher or enthusiast accidentally stumbling across it and ruining it.
Yes of course, you're right. The point I'm making is that wherever you're putting in backdoors, instead of backdoors, you can just leave unlatched vulnerabilities. Gives you solid plausible deniability.