From owner-freebsd-security Mon May 28 16:38:26 2001 Delivered-To: freebsd-security@freebsd.org Received: from ringworld.nanolink.com (ringworld.nanolink.com [195.24.48.13]) by hub.freebsd.org (Postfix) with SMTP id A119F37B422 for ; Mon, 28 May 2001 16:38:21 -0700 (PDT) (envelope-from roam@orbitel.bg) Received: (qmail 39572 invoked by uid 1000); 28 May 2001 23:37:22 -0000 Date: Tue, 29 May 2001 02:37:22 +0300 From: Peter Pentchev To: Retal Cc: freebsd-security@freebsd.org Subject: Re: Kernel message Message-ID: <20010529023722.C30478@ringworld.oblivion.bg> Mail-Followup-To: Retal , freebsd-security@freebsd.org References: <001a01c0e7d2$97743e20$b88f39d5@a> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <001a01c0e7d2$97743e20$b88f39d5@a>; from lirandb@netvision.net.il on Tue, May 29, 2001 at 02:02:03AM +0200 Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Tue, May 29, 2001 at 02:02:03AM +0200, Retal wrote: > I got this message while i was changing icmpbandlim from 200 to 30: > May 29 01:42:14 freebsd /kernel: Limiting closed port RST response from 78 to 30 > packets per second > > i got this message like 10000 times.. > What is that means.. Somebody was portscanning you - running a simple program that connects to every port from 1 to, say, 32768, on your machine, to see which ports are 'open' - what services (daemons, servers) you are running on your machine. The kernel had to sent a lot of 'connection refused' ('closed' port, not open) messages, and it had a max value of 30 of those per second. It is informing you that in one given second, it was supposed to send out 78 of those, but it only sent 30. So.. somebody was portscanning you. If you are running any programs that have known security issues, you had better stop them. Look at the output of sockstat -4 to see which ports you have open (if your FreeBSD is 4.3 or later, you can use sockstat -4l to see listening sockets only), then look at the FreeBSD website to find a list of security advisories to see if any of the programs you are running are vulnerable in the versions on your machine. G'luck, Peter -- I am the meaning of this sentence. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message