Date: Mon, 13 Oct 2003 22:08:24 -0500 From: Kenton Brede <kbrede@nixnotes.org> To: FreeBSD Questions <questions@freebsd.org> Subject: Re: /tmp suddenly full - possible DOS hack? Message-ID: <20031014030824.GA509@gravity.nixnotes.org> In-Reply-To: <7AA36E92-FDF2-11D7-A861-000A95A0485E@mac.com> References: <7AA36E92-FDF2-11D7-A861-000A95A0485E@mac.com>
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On Mon, Oct 13, 2003 at 10:59:51PM -0400, Barry Hawkins wrote: > List, > I have a single FreeBSD server (5.1) that I run at home behind a > firewall with ports open for ssh, dns, and http. I began having > trouble with my DNS not responding, then noticed that ssh was not > responding either. Upon logging in at the server, I noticed error > messages about my /tmp filesystem being full. Issuing df revealed the > following: > > Filesystem 1K-blocks Used Avail Capacity Mounted on > /dev/ad0s1a 253678 72770 160614 31% / > devfs 1 1 0 100% /dev > /dev/ad0s1e 253678 542 232842 0% /tmp > /dev/ad0s1f 8209710 3440818 4112116 46% /usr > /dev/ad0s1d 253678 253106 -19722 108% /var > > Upon further investigation, I noticed a series of grossly bloated > messages logs: > > -rw-r--r-- 1 root wheel 43001 Oct 13 22:37 messages > -rw-r--r-- 1 root wheel 196001815 Oct 13 17:00 messages.0 > -rw-r--r-- 1 root wheel 87398 Oct 13 16:00 messages.1.bz2 > -rw-r--r-- 1 root wheel 87096 Oct 13 15:00 messages.2.bz2 > -rw-r--r-- 1 root wheel 109446 Oct 13 14:00 messages.3.bz2 > -rw-r--r-- 1 root wheel 184596 Oct 13 13:00 messages.4.bz2 > -rw-r--r-- 1 root wheel 36822 Oct 13 12:00 messages.5.bz2 > > This is the first BSD box that I have had that allows DNS queries, > and this is the first time I have experienced something like this. Is it > some sort of DOS attack? I am sure there are a hundred variables that > I am unaware of, but if some of the list sages could be so kind as to > prod me in the right direction(s) I would be most appreciative. > Have you looked in the "messages" log files? What entries do they contain? That could give you a clue. Kent -- "I am always doing that which I can not do, in order that I may learn how to do it." --Pablo Picasso
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