Penetration Testing mailing list archives
RE: Multiple Spoofed HTTP Requests
From: "Payton, Zack" <Zack.Payton () MWAA com>
Date: Sat, 3 Sep 2005 12:21:00 -0400
S, You're right in that before the operating system will even hand off the socket to the web server process the three way handshake must be completed first. If you can't view the return packets that you have no idea what the web server chose as its Initial Sequence Number (ISN). This is the biggest thing that you need to acquire in order to complete that handshake blindly. You can use various tools (scapy, ISNsampler, etc) to see if the remote TCP/IP stack uses a flawed algorithm to generate that ISN number and if so construct a set of possible ISN's that will be selected for the next connection and then create a group of packets that contain the possible next ISN. This topic is covered in two very important papers related to this topic here: http://lcamtuf.coredump.cx/newtcp/ He actually graphs the ISN's to 3d and is able to generate sets of ISN's that are potentially the next selected ISN. Good luck, Z -----Original Message----- From: kuffya () gmail com [mailto:kuffya () gmail com] Sent: Friday, September 02, 2005 9:12 AM To: pen-test () securityfocus com Subject: Multiple Spoofed HTTP Requests Hi list, I've used a variety of tools such as Nemesis, Packet Xcalibur & Libnet GUI to craft customized packets. Using such tools, you can create packets at layers 2 up to 5 possibly spoofing your source IP, port numbers or whatever you see fit. The question is : Would it be possible to craft a HTTP request(or multiple requests) using a spoofed IP address? I'm inclined to consider that it's not, the reason being you must have a 3-way handshake established before you can start talking application layer protocols (such as HTTP). If you use a spoofed IP address, then there's no way of doing that. On the other hand, I might be totally wrong, that's why I'm asking the list, for the list is wise. If, however, it is possible could you please give me some directions on how to do it? Thanks a lot S. ------------------------------------------------------------------------ ------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 ------------------------------------------------------------------------ ------- ------------------------------------------------------------------------------ Audit your website security with Acunetix Web Vulnerability Scanner: Hackers are concentrating their efforts on attacking applications on your website. Up to 75% of cyber attacks are launched on shopping carts, forms, login pages, dynamic content etc. Firewalls, SSL and locked-down servers are futile against web application hacking. Check your website for vulnerabilities to SQL injection, Cross site scripting and other web attacks before hackers do! Download Trial at: http://www.securityfocus.com/sponsor/pen-test_050831 -------------------------------------------------------------------------------
Current thread:
- Multiple Spoofed HTTP Requests kuffya (Sep 02)
- RE: Multiple Spoofed HTTP Requests Omar A. Herrera (Sep 03)
- Re: Multiple Spoofed HTTP Requests Jayson Anderson (Sep 03)
- RE: Multiple Spoofed HTTP Requests Kyle Starkey (Sep 03)
- Re: Multiple Spoofed HTTP Requests Kaj Huisman (Sep 03)
- <Possible follow-ups>
- RE: Multiple Spoofed HTTP Requests Payton, Zack (Sep 03)
- Re: Multiple Spoofed HTTP Requests Marco Ivaldi (Sep 05)
- Whitespace in passwords bryan allott (Sep 06)
- Re: Whitespace in passwords Bruce K. Marshall (Sep 07)
- Re: Whitespace in passwords Anurag Joshi (Sep 11)
- Re: Whitespace in passwords Bruce K. Marshall (Sep 12)
- Whitespace in passwords bryan allott (Sep 06)