Security Incidents mailing list archives
RE: HTTP worm?
From: "Dario Ciccarone (dciccaro)" <dciccaro () cisco com>
Date: Mon, 27 Aug 2007 19:13:16 -0400
Using port 80/tcp or any other well-known port (23/tcp, 22/tcp, 21/tcp, etc.) was an old trick back when firewalls were nothing more than stateless ACLs and people neede to allow 'return traffic' from those ports for connections initiated from the inside (and forgot the "established" keyword ;)) Maybe someone is trying the same old technique again? And hoping it flies under the radar? What packets are you seeing? Are those SYN? FIN? What tool gave you the alarm? An IDS? IPS? Netflow? The fact of not having PTR records is interesting - but NOT teling. Think "people on PPPoE/DHCP hosting their own web server for sharing X, and not using DynDNS or similar service" Setup a honeypot? Become the next Clifford Stoll ? :) Dario
-----Original Message----- From: Steve Huston [mailto:huston () astro princeton edu] Sent: Monday, August 27, 2007 7:52 AM To: incidents () securityfocus com Subject: HTTP worm? I don't have any details or traffic to show for it, but since Friday I've seen an awful lot of complaints from my firewall about "port scans" coming from remote hosts port 80 to 1-2 ports on machines in my department. The first ones I noticed were coming from a web server on campus but outside my control, and since then I've seen them from many other sites (most if not all of which have no PTR records). Is there some kind of worm that I haven't paid attention to that might be causing this, or would my time be better spent looking for a network issue instead? When I discovered it on Friday, I thought it could be due to delayed responses which took longer than the firewall's session timeout to return, but then finding these packets coming from hosts with no PTR makes me wonder if it's something more nefarious. -- Steve Huston - W2SRH - Unix Sysadmin, Dept. of Astrophysical Sciences Princeton University | ICBM Address: 40.346525 -74.651285 126 Peyton Hall |"On my ship, the Rocinante, wheeling through Princeton, NJ 08544 | the galaxies; headed for the heart of Cygnus, (609) 258-7375 | headlong into mystery." -Rush, 'Cygnus X-1' -------------------------------------------------------------- ----------- This list sponsored by: SPI Dynamics ALERT: .How a Hacker Launches a SQL Injection Attack!.- White Paper It's as simple as placing additional SQL commands into a Web Form input box giving hackers complete access to all your backend systems! Firewalls and IDS will not stop such attacks because SQL Injections are NOT seen as intruders. Download this *FREE* white paper from SPI Dynamics for a complete guide to protection! https://download.spidynamics.com/1/ad/sql.asp?Campaign_ID=7016 0000000Cn8E -------------------------------------------------------------- ------------
------------------------------------------------------------------------- This list sponsored by: SPI Dynamics ALERT: .How a Hacker Launches a SQL Injection Attack!.- White Paper It's as simple as placing additional SQL commands into a Web Form input box giving hackers complete access to all your backend systems! Firewalls and IDS will not stop such attacks because SQL Injections are NOT seen as intruders. Download this *FREE* white paper from SPI Dynamics for a complete guide to protection! https://download.spidynamics.com/1/ad/sql.asp?Campaign_ID=70160000000Cn8E --------------------------------------------------------------------------
Current thread:
- HTTP worm? Steve Huston (Aug 27)
- RE: HTTP worm? Dario Ciccarone (dciccaro) (Aug 27)
- RE: HTTP worm? Geoff Martin (Aug 27)
- Re: HTTP worm? Joshua J. Talbot (Aug 27)
- <Possible follow-ups>
- Re: HTTP worm? bugtraq (Aug 30)