January 2007
Intermediate to advanced
190 pages
3h 47m
English
Content preview from The Oracle® Hacker's Handbook: Hacking and Defending Oracle
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,
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.
2.2. Getting the Oracle Version
There are many ways of getting the Oracle version number back prior to authentication — so many in fact that people who worry about attackers being able to get the version number should stop worrying and just accept it.
Of course, you can use TCP node valid checking and set firewall rules to disallow traffic, but if an attacker is coming from an "allowed" source, i.e., node, then you'll have to put up with people being able to get your version number; doing so is built into the protocol itself. Let's explore a few of the ways to get the version number — some methods are widely known, others less so.
2.2.1. The Listener Version and Status Command
The Listener Control Utility has both a version command and a status command. They both can be issued from the client to request the Listener's version number. Details about the operating system on which the Listener runs are also revealed. Note that while Oracle prevents the status command from working on 10g remotely, version still works. Here's the output from a version command:
C:\>lsnrctl LSNRCTL for 32-bit Windows: Version 8.1.7.4.0 – Production on 19-JUN-2006 17:54:42 (c) Copyright 1998 Oracle Corporation. All rights reserved. Welcome to LSNRCTL, type "help" for information. LSNRCTL> set current_listener 192.168.0.120 Current Listener is 192.168.0.120 LSNRCTL> version Connecting to (DESCRIPTION=(CONNECT_DATA=(SID=*)(SERVICE_NAME=192.168.0.120))(ADDRESS= (PROTOCOL=TCP)(HOST=192.168.0.120)(PORT=1521))) ...
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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.