Giorgos Keramidas wrote:
On 2006-03-04 00:44, K?vesd?n G?bor <[EMAIL PROTECTED]> wrote:
Hello,
look at this:
[EMAIL PROTECTED] w
12:41AM up 82 days, 10:05, 0 users, load averages: 0.00, 0.00, 0.00
USER TTY FROM LOGIN@ IDLE WHAT
[EMAIL PROTECTED]
Where am I? :) I don't know exactly how it happened, but I'll
investigate, I have an idea and I'll report if I find out.
Some programs may tweak wtmp to `hide' users that are actively logged
in. One program that I know can do this is screen(1). Hitting ``^A L''
here, between successive `w' invocations, I can see this:
[EMAIL PROTECTED]:/root# w
2:04AM up 2:10, 1 user, load averages: 0.07, 0.16, 0.19
USER TTY FROM LOGIN@ IDLE WHAT
[EMAIL PROTECTED]:/root# w
2:05AM up 2:11, 2 users, load averages: 0.03, 0.14, 0.17
USER TTY FROM LOGIN@ IDLE WHAT
root pts/0 :0:S.0 2:05AM - w
[EMAIL PROTECTED]:/root#
And what do the other logged in users see? With my method I can
completely hide, nobody can see me logged in. So I think it might be an
opportunity to abusing. I'll send a PR soon, I just wanted to know
before if somebody already knows about this trick.
Gabor Kovesdan
P.S.: It happened on a RELENG_5_3 system via SSH, but I suppose it can
be triggered locally.
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