Re: malware defense

Jeffrey B. Siegal (jbs@quiotix.com)
Fri, 3 Dec 1999 20:51:06 -0800

> > > 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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