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Date: Thu, 16 Jun 2005 23:24:30 +1000 (EST)
From: Neo-Vortex <root@Neo-Vortex.net>
To: Saurabh Bhasin <sbhasin@gmail.com>
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Cc: freebsd-security@freebsd.org
Subject: Re: last command - strange entries?
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On Wed, 15 Jun 2005, Saurabh Bhasin wrote:

> Greetings,
>
> I am seeing strange entries when i perform "last -20" for example.
> Here's a sample output becuase I can not seem to make any sense out of
> this in the last two days and can't find any information online. Any
> help is appreciated.
>
> 0                F=3D=B0Bttyp                  Wed Dec 31 16:00   still l=
ogged in
> 0                6=DB=AFBttyp                  Wed Dec 31 16:00   still l=
ogged in
> 0                m=DA=AFBttyp                  Wed Dec 31 16:00   still l=
ogged in
> 7                m=DA=AFBttyv                  Wed Dec 31 16:00   still l=
ogged in
> 0                =AFBttyp                  Wed Dec 31 16:00   still logge=
d in
> 0                (o=AFBttyp                  Wed Dec 31 16:00   still log=
ged in
> 2                =EBg=AFBttyp                  Wed Dec 31 16:00   still l=
ogged in
> .
>
> and it keeps going for 20 lines.

The last command uses /var/log/wtmp and /var/log/utmp (mabe even
/var/log/lastlog) - anyway, the point is, it uses those files to get the
information, now, it appears as if they have become corrupt, mabe by
userland/kernel land desynch? bad upgrade? tried a reboot?

Else, can you give us more details about the system, past upgrades,
intrusions?

~NVX