Date: Sat, 04 Mar 2006 09:00:03 +0100 From: =?ISO-8859-1?Q?K=F6vesd=E1n_G=E1bor?= <gabor.kovesdan@t-hosting.hu> To: Giorgos Keramidas <keramida@ceid.upatras.gr> Cc: freebsd-questions@freebsd.org Subject: Re: Where am I? :) Message-ID: <44094903.8080006@t-hosting.hu> In-Reply-To: <20060304000640.GA26726@flame.pc> References: <4408D4D3.4030102@t-hosting.hu> <20060304000640.GA26726@flame.pc>
next in thread | previous in thread | raw e-mail | index | archive | help
Giorgos Keramidas wrote: >On 2006-03-04 00:44, K?vesd?n G?bor <gabor.kovesdan@t-hosting.hu> wrote: > > >>Hello, >> >>look at this: >> >>root@server# w >>12:41AM up 82 days, 10:05, 0 users, load averages: 0.00, 0.00, 0.00 >>USER TTY FROM LOGIN@ IDLE WHAT >>root@server# >> >>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: > >root@flame:/root# w > 2:04AM up 2:10, 1 user, load averages: 0.07, 0.16, 0.19 >USER TTY FROM LOGIN@ IDLE WHAT >root@flame:/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 >root@flame:/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.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?44094903.8080006>