Security Basics mailing list archives
Re: Strange pings from 127.0.0.1
From: Ranjeet Shetye <ranjeet.shetye2 () zultys com>
Date: Fri, 18 Jun 2004 15:06:42 -0700
consider a packet of the type Eth_DST=Eth_A Eth_SRC=Eth_B Eth_Type=IP IP_Src=127.0.0.1 IP_Dst=IP_D On Linux - packets from localhost to a local IP dont make it onto the network. Assuming the same to be the case on Windows, any target hosts (IP_D) that you see ICMPs for, are probably NOT the origin of THIS packet. This might help you narrow the possible sources of the traffic. Next, (assuming non-promiscuous mode of operation by the NIC) I fail to understand how the author of this attack intends to reach his/her targets, if the dest MAC addresses are fake! I might be missing something obvious, so if someone can point it out to me, that would be great. thanks. Instead of an attack, it might be that you have someone on your network who is learning socket or libnet programming, and is testing his/her networking coding skills on the corporate network. That might explain the non-existant destination MAC addresses - which I admit again, don't make a lot of sense to me. **Unless**, some kind of an ARP-poisoning scheme is being executed, so that switches are forced to forward all traffic on all ports cos their internal arp tables are messed up. In which case, maybe you need to lock down the arp tables in your managed switches, if you can. I am very curious about this traffic pattern, please let us know the answer once you've resolved it. thanks, -- Ranjeet Shetye Senior Software Engineer Zultys Technologies Ranjeet dot Shetye at Zultys dot com http://www.zultys.com/ The views, opinions, and judgements expressed in this message are solely those of the author. The message contents have not been reviewed or approved by Zultys. * Timothy Schwimer (tschwimer () hotmail com) wrote:
Not yet. Doesn't sound like you're having the same issue though. Mine is all ICMP traffic, all sourced from the loopback, but destined to several different host IP's. In addition, the source and dest MAC are always the same regardless of the IP's. I'm fairly certain that I've got a compromised host, but with the source IP being a loopback, I've got no way of deducing which host.From: Murad Talukdar <talukdar_m () subway com> To: Tim Schwimer <tschwimer () hotmail com>, security-basics () securityfocus com Subject: Re: Strange pings from 127.0.0.1 Date: Fri, 18 Jun 2004 09:43:07 +1000 I've been getting this on my router logs saying that the tcp got dropped. Source:127.0.0.1, 80, WAN - Destination:210.80.144.150, 1912, LAN - 'Suspicious TCP Data' Did you work out what it was with the pings? Not sure if it's similar or not. Murad Talukdar ----- Original Message ----- From: "Tim Schwimer" <tschwimer () hotmail com> To: <security-basics () securityfocus com> Sent: Sunday, June 13, 2004 5:24 PM Subject: Re: Strange pings from 127.0.0.1In-Reply-To: <GAEPLEDFDDGJLBGAABCNKENBCMAA.gg () stober mailsnare net> I started seeing the same thing on my DMZ segments this Friday afternoonat about 4:00pm (figures, huh??). Anyway, I was wondering what you found out about this. Any insight would be appreciated.Thanks, TReceived: (qmail 20239 invoked from network); 14 May 2004 15:58:54-0000Received: from outgoing.securityfocus.com (HELOoutgoing2.securityfocus.com) (205.206.231.26)by mail.securityfocus.com with SMTP; 14 May 2004 15:58:54 -0000 Received: from lists.securityfocus.com (lists.securityfocus.com[205.206.231.19])by outgoing2.securityfocus.com (Postfix) with QMQP id 4018A1437B0; Fri, 14 May 2004 17:53:53 -0600 (MDT) Mailing-List: contact security-basics-help () securityfocus com; run byezmlmPrecedence: bulk List-Id: <security-basics.list-id.securityfocus.com> List-Post: <mailto:security-basics () securityfocus com> List-Help: <mailto:security-basics-help () securityfocus com> List-Unsubscribe:<mailto:security-basics-unsubscribe () securityfocus com>List-Subscribe: <mailto:security-basics-subscribe () securityfocus com> Delivered-To: mailing list security-basics () securityfocus com Delivered-To: moderator for security-basics () securityfocus com Received: (qmail 13781 invoked from network); 13 May 2004 21:45:06-0000From: "Marc" <gg () stober mailsnare net> To: <security-basics () securityfocus com> Subject: Strange pings from 127.0.0.1 Date: Thu, 13 May 2004 23:55:35 -0400 Message-ID: <GAEPLEDFDDGJLBGAABCNKENBCMAA.gg () stober mailsnare net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal The networked applications I am responsbile for have been performingslowly.When I tried to run Ethereal on my computer, I found some odd ICMP echo request (ping) packets with a source IP of 127.0.01, to addresses both within our 192.168.1.* network as well as to random Internet addresses.Thesource and destination Mac addresses aren't anything I can associatewith acomputer on our network (and they're not the real Mac address of my computer), so I think maybe these packets are spoofed? Could this besomesort of virus or DOS attack somewhere within our network? I've haven'tseenanything quite like this mentioned online anywhere. Thanks, Marc---------------------------------------------------------------------------Ethical Hacking at the InfoSec Institute. Mention this ad and get $545offany course! All of our class sizes are guaranteed to be 10 students orlessto facilitate one-on-one interaction with one of our expertinstructors.Attend a course taught by an expert instructor with years ofin-the-fieldpen testing experience in our state of the art hacking lab. Master theskillsof an Ethical Hacker to better assess the security of yourorganization.Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.html------------------------------------------------------------------------------------------------------------------------------------------------------ -Ethical Hacking at the InfoSec Institute. Mention this ad and get $545offany course! 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Current thread:
- Re: Strange pings from 127.0.0.1 Tim Schwimer (Jun 14)
- Re: Strange pings from 127.0.0.1 Murad Talukdar (Jun 18)
- <Possible follow-ups>
- Re: Strange pings from 127.0.0.1 Timothy Schwimer (Jun 18)
- Re: Strange pings from 127.0.0.1 Ranjeet Shetye (Jun 21)
- Re: Strange pings from 127.0.0.1 Nelson Santos (Jun 23)
- RE: Strange pings from 127.0.0.1 David Gillett (Jun 24)
- Re: Strange pings from 127.0.0.1 Ranjeet Shetye (Jun 21)
- Strange pings from 127.0.0.1 Andrew Aris (Jun 22)
- Re: Strange pings from 127.0.0.1 Alan Hicks (Jun 23)
- Re: Strange pings from 127.0.0.1 Kelly John Rose (Jun 23)
- RE: Strange pings from 127.0.0.1 David Gillett (Jun 24)
- RE: Strange pings from 127.0.0.1 Andrew Aris (Jun 24)
- Re: Strange pings from 127.0.0.1 Kelly John Rose (Jun 25)
- Re: Strange pings from 127.0.0.1 SecurityFocus Lists (Jun 24)
- Re: Strange pings from 127.0.0.1 Kelly John Rose (Jun 25)