Messages in this thread | | | Date | Fri, 3 Dec 1999 20:51:06 -0800 | From | "Jeffrey B. Siegal" <> | Subject | Re: malware defense |
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> > > How do you protect against corruption/replacement of the daemon software > > > that checks the images? > > Keep it in physically unwritable media, like a CD-R in a CD-ROM drive. > How will it help if trojan already modified the kernel image?
1. Keep the kernel image on non-writable media as well.
2. If the kernel is compromised, then kernel-level protection doesn't help you either (the above was a reference to the claim that user-level daemons couldn't be trusted). You're screwed unless your defense is implemented in hardware (which is basically equivalent to putting the kernel and security daemons on non-writable media).
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