Penetration Testing mailing list archives
RE: Inaccessible Port 80 - Pentest
From: "Shenk, Jerry A" <jshenk () decommunications com>
Date: Fri, 8 Aug 2008 13:22:15 -0400
- Maybe that's the administrative port on their firewall and they're not doing an adequate job blocking access. - Maybe it's not really a web site and you aren't doing the appropriate handshake Have you tried connecting using Netcat or something like that....maybe it's giving you more than you think. Does it drop you RIGHT AWAY or does it only drop you after some amount of time, some amount/type of input? -----Original Message----- From: listbounce () securityfocus com [mailto:listbounce () securityfocus com] On Behalf Of arvind doraiswamy Sent: Thursday, August 07, 2008 11:45 PM To: pen-test () securityfocus com Subject: Inaccessible Port 80 - Pentest Hey Guys, Very recently we did a PenTest for a client where we came across a strange(atleast to me) situation. Had an IP block which on scanning revealed only port 80 open which sounded ok. Any kind of requests though from the external world - I tried from multiple IP's and even through TOR were blocked by a firewall which kept displaying its custom "Access denied" page. So obviously there was some kind of IP based restriction in place which said -- Only these IP's can connect to whatever is running on port 80. No problems till here. My question is: Why would anyone want to have a live server on the Internet, open one port on it and then block it from public use? Obvious answers that sprung to mind were: a) Maybe its an internal server running a web app to be accessed only internally ----- So why is it public , in the DMZ then? Shouldnt it be on the internal network? b) Maybe some hosts/apps on the internal network needed to connect to port 80 of a DMZ server before going out? ------ Then again why is it public. These servers could be placed on an internal segment and the traffic could be NATTEd before it goes out like all other Internet destined traffic. And Secondly I am not able to think of a situation like this --- What traffic apart from a proxy could behave this way --- where I have -- Internal IP -------> DMZIP:80 ---------> Internet ? And mind you this wasnt just 1 IP - there were many, so I'm quite sure I've missed something. What are your thoughts? Thnx Arvind ------------------------------------------------------------------------ This list is sponsored by: Cenzic Top 5 Common Mistakes in Securing Web Applications Get 45 Min Video and PPT Slides www.cenzic.com/landing/securityfocus/hackinar ------------------------------------------------------------------------ **DISCLAIMER This e-mail message and any files transmitted with it are intended for the use of the individual or entity to which they are addressed and may contain information that is privileged, proprietary and confidential. If you are not the intended recipient, you may not use, copy or disclose to anyone the message or any information contained in the message. If you have received this communication in error, please notify the sender and delete this e-mail message. The contents do not represent the opinion of D&E except to the extent that it relates to their official business. ------------------------------------------------------------------------ This list is sponsored by: Cenzic Top 5 Common Mistakes in Securing Web Applications Get 45 Min Video and PPT Slides www.cenzic.com/landing/securityfocus/hackinar ------------------------------------------------------------------------
Current thread:
- Inaccessible Port 80 - Pentest arvind doraiswamy (Aug 08)
- Re: Inaccessible Port 80 - Pentest Matthew Leeds (Aug 08)
- RE: Inaccessible Port 80 - Pentest Shenk, Jerry A (Aug 08)
- Message not available
- Fwd: Inaccessible Port 80 - Pentest arvind doraiswamy (Aug 08)
- Re: Inaccessible Port 80 - Pentest kevin horvath (Aug 09)
- Re: Inaccessible Port 80 - Pentest arvind doraiswamy (Aug 09)
- Re: Inaccessible Port 80 - Pentest Steve Armstrong (Aug 09)
- Re: Inaccessible Port 80 - Pentest ॐ aditya mukadam ॐ (Aug 11)