December 2012
Intermediate to advanced
552 pages
13h 16m
English
Content preview from Web Application Defender's CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Recipe 7-2: Detecting the Submission of Multiple Usernames
This recipe shows you how to identify when attackers cycle through many different usernames during authentication attempts.
Ingredients
- ModSecurity
- SecRule directive
- @within operator
- initcol action
- setvar action
- expirevar action
Because most average users choose weak passwords, attackers can easily pick a simple password and then cycle through various known usernames in hopes of hitting on a valid combination. Let’s look at some real-world attack examples.
Horizontal Brute-Force Scanning
One of the projects I lead for the Web Application Security Consortium (WASC) is the Distributed Web Honeypot Project. As part of this project, participants can deploy open proxy Apache web servers that attackers will eventually use to loop their attack traffic through in hopes of hiding their source IP address. While monitoring the honeypot traffic, we identified a widespread authentication attack against Yahoo! accounts. Here is a sample of the attack traffic:
GET http://217.12.8.76/config/isp_verify_user?l=bandit_unreal&
p=123456 HTTP/1.0
GET http://202.86.7.110/config/isp_verify_user?l=federico_lara&
p=123456 HTTP/1.0
GET http://202.86.7.110/config/isp_verify_user?l=felipe_rogelio&
p=123456 HTTP/1.0
GET http://66.163.169.179/config/isp_verify_user?l=bambi_shelton&
p=123456 HTTP/1.0
GET http://119.160.244.232/config/isp_verify_user?l=dinamis18&
p=123456 HTTP/1.0 GET https://login.yahoo.com/config/isp_verify_user?l=felix_pay& ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.