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,
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Recipe 9-1: Blocking Non-ASCII Characters
This recipe shows you how to determine when attackers attempt to submit non-ASCII characters.
Ingredients
- OWASP ModSecurity Core Rule Set (CRS)
- modsecurity_crs_20_protocol_violations.conf
- ModSecurity
- ARGS variable
- ARGS_NAMES variable
- REQUEST_HEADERS variable
- @validateByteRange operator
CAPEC-52: Embedding NULL Bytes
An attacker embeds one or more null bytes in input to the target software. This attack relies on the usage of a null-valued byte as a string terminator in many environments. The goal is for certain components of the target software to stop processing the input when they encounter the null byte(s).
Sample Attacks
The following attacks were captured from web server honeypot sensors:
209.235.136.112 - - [15/Apr/2012:16:55:36 +0900] "GET
/index.php?option=com_ganalytics&controller=../opt/lampp/logs/
error_log%00.php HTTP/1.0" 404 204
209.235.136.112 - - [15/Apr/2012:16:49:22 +0900] "GET
/index.php?option=com_ganalytics&controller=../etc/group%00.php
HTTP/1.0"
404 204
209.235.136.112 - - [15/Apr/2012:16:49:31 +0900] "GET /index.php?
option=com_ganalytics&controller=../etc/passwd%00.php HTTP/1.0"
404 204
209.235.136.112 - - [15/Apr/2012:16:48:49 +0900] "GET /index.php?
option=com_ganalytics&controller=../etc/shadow%00.php HTTP/1.0"
404 204In these examples, the attacker is attempting to access other OS-level files within the controller parameter of a specific WordPress ...
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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.