Actually, a defense here is to umount the path then remount it as a part of running the Aide script. There may be an end-run to this as well- security is a never-ending battle.
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From: CentOS <centos-bounces@xxxxxxxxxx> on behalf of Leroy Tennison <leroy@xxxxxxxxxxxxxxxx>
Sent: Thursday, November 14, 2019 1:20 PM
To: CentOS mailing list <centos@xxxxxxxxxx>
Subject: Re: how to know when a system is compromised
<sigh> Thanks - I'll keep that in mind...
Harriscomputer
Leroy Tennison
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E: leroy@xxxxxxxxxxxxxxxx
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From: CentOS <centos-bounces@xxxxxxxxxx> on behalf of Chris Adams <linux@xxxxxxxxxxx>
Sent: Thursday, November 14, 2019 10:57 AM
To: centos@xxxxxxxxxx <centos@xxxxxxxxxx>
Subject: [EXTERNAL] Re: how to know when a system is compromised
Once upon a time, Leroy Tennison <leroy@xxxxxxxxxxxxxxxx> said:
> The executable could be placed on mounted read-only media
That's not as secure as you think. Linux bind mounts can mount a file
over another file (plus there's overlay filesystems), so it's possible
to replace a binary even on a read-only device.
--
Chris Adams <linux@xxxxxxxxxxx>
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E: leroy@xxxxxxxxxxxxxxxx
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