Am 27.02.2013 11:17, schrieb James Courtier-Dutton:
3) Trust based on date. I trust everything from X that I put on my system 2 weeks ago, but one week ago X got hacked, so don't trust anything new from them until the hack has been stopped and the revokation/correction steps have been completed. E.g. the Bit9 case, where malware was able to be signed.
Which date? In reality dates are (mostly) defined as fixed points, but computers just don't have such.
E.g. currently you can't use modsign based on X.509 certificates if the date comes through USB, because modsign tries to load the certificate before before the USB stack comes up, which ends up with invalid dates (Not Before). And changing the system date isn't that hard for an attacker if he is already able to do other bad things.
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