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©2009 Justin C. Klein Keane PHP Code Auditing Session 3 – Tools of the Trade & Crafting Malicious Input Justin C. Klein Keane
©2009 Justin C. Klein Keane Setting Up Environment Install VMWare workstation, or player Fusion on the Mac Download the target host Unzip the host files then start the host in VMWare
©2009 Justin C. Klein Keane Get VMWare Image Running If prompted, say you moved the image
©2009 Justin C. Klein Keane CentOS Image Booting Once image boots log in with root/password
©2009 Justin C. Klein Keane Find the IP Address Get the IP address of the virtual machine using # /sbin/ifconfig eth0
©2009 Justin C. Klein Keane Ensure Apache is Running
©2009 Justin C. Klein Keane Upload the Exercise
©2009 Justin C. Klein Keane Extract the Exercise
©2009 Justin C. Klein Keane Install the Database
©2009 Justin C. Klein Keane Check the Application
©2009 Justin C. Klein Keane Troubleshooting If you get a blank screen, check the web server and MySQL server: # service httpd status # service mysqld status If you need to start services use: # /etc/rc.d/init.d/httpd restart # /etc/rc.d/init.d/mysqld restart
©2009 Justin C. Klein Keane Troubleshooting Cont. Check the log files: # tail /var/log/httpd/error_log
©2009 Justin C. Klein Keane Install Eclipse PDT Download PDT all in one from Alternatively install Eclipse from Be sure to download “Eclipse IDE for Java Developers”
©2009 Justin C. Klein Keane Install PDT if Necessary Use instructions at Some platforms, such as Fedora, may have packages for PHP development, these may be more stable than a manual install of PDT
©2009 Justin C. Klein Keane Install RSE Install the Remote System Explorer tools Help -> Software Updates Click the “Add Site” button Enter the URL s/ Select Remote System Explorer Core, Remote System Explorer End-User Runtime, Remote System Explorer Extender SDK, and RSE SSH Service
©2009 Justin C. Klein Keane Install the RSE Components Click “Install”
©2009 Justin C. Klein Keane Open Eclipse Default “perspective” is dull and doesn't suit our purposes Click Window -> Show View -> Remote System In the new window right click and select “new connection”
©2009 Justin C. Klein Keane Add New Connection Select “SSH Only”, click Next
©2009 Justin C. Klein Keane Connection Details Fill in VMWare host information, click Finish
©2009 Justin C. Klein Keane Connect to Remote Host Click the down arrow for the host, then “Sftp Files” then “Root” and enter credentials
©2009 Justin C. Klein Keane View Source
©2009 Justin C. Klein Keane Look for Potential SQL Injection
©2009 Justin C. Klein Keane Testing the Injection First we'll try the injection using manual methods Next we'll use some tools to help us out Sometimes manual testing may be impossible
©2009 Justin C. Klein Keane Manual Testing
©2009 Justin C. Klein Keane Using Tamper Data To start Firefox Tamper Data plugin select Tools -> Tamper Data Click “Start Tamper” in the upper left Fill in your test values again and submit When prompted click “Tamper”
©2009 Justin C. Klein Keane That's Interesting
©2009 Justin C. Klein Keane Tamper Fill in new values for Post Parameters Note that you can also tamper with Cookies and Referer Data Click “OK” when you're happy with your values
©2009 Justin C. Klein Keane That's More Like It
©2009 Justin C. Klein Keane Checking Cookies You can also view cookies using the Web Developer Plugin select Cookies -> View Cookie Information
©2009 Justin C. Klein Keane Using Web Developer
©2009 Justin C. Klein Keane Paros Download Paros from Paros is Java based, so if Eclipse can run on your machine, so can Paros Paros is a proxy, so it captures requests from your web browser to a server and responses from the server back to your browser You can use it to alter your requests quite easily
©2009 Justin C. Klein Keane Start Up Paros
©2009 Justin C. Klein Keane Configure Firefox You need to configure Firefox to use Paros as a proxy Choose Edit -> Preferences, then Advanced - > Network -> Settings
©2009 Justin C. Klein Keane Configure Settings
©2009 Justin C. Klein Keane Create Request Once Firefox is configured to utilize Paros browse through the site normally Note how Paros records all your interactions Try submitting the login form Note that Paros records GET and POST requests
©2009 Justin C. Klein Keane Paros in Action
©2009 Justin C. Klein Keane Paros Records Details
©2009 Justin C. Klein Keane Alter Requests To alter a request click on it in the bottom window Next right click and select “Resend” This opens a new window where you can alter any of the send requests Change any data and click the “Send” button
©2009 Justin C. Klein Keane Paros Resend
©2009 Justin C. Klein Keane Response is Raw
©2009 Justin C. Klein Keane Our Target $sql = "select user_id from user where user_username = '". $_POST['username']. "' AND user_password = md5('". $_POST['password']. "')";
©2009 Justin C. Klein Keane Target SQL select user_id from user where user_username = 'somename' and user_password = md5('somepass');
©2009 Justin C. Klein Keane Possible Permutation select user_id from user where user_username = 'somename' or 1='1' and user_password = md5('somepass'); What is the proper input to create this statement?
©2009 Justin C. Klein Keane Testing Your SQL
©2009 Justin C. Klein Keane Bypassing Login with SQL Injection
©2009 Justin C. Klein Keane We're In!
©2009 Justin C. Klein Keane Chained Exploits Note that the exploitation of the authentication leads to access to new, potentially exploitable functionality Authentication leads to cookie granting Admin functions are often “trusted”
©2009 Justin C. Klein Keane Steps to Remember Look for vulnerabilities In the source code In the functional front end Test your exploits in the “friendliest” environment possible Use tools to recreate attacks in the live environment.
©2009 Justin C. Klein Keane For Next Time -Install Paros Proxy -Install Firefox and the Tamper Data and Web Developer plug ins -Download and install the sample SQL injection application on your VM -Identify at least 4 SQL injection vulnerabilities -Develop exploits for each vulnerability -Develop fixes for each vulnerability
©2009 Justin C. Klein Keane PHP Code Auditing Session 6 Auditing Strategies & Demonstration Justin C. Klein Keane
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©2009 Justin C. Klein Keane PHP Code Auditing Session 5 XSS & XSRF Justin C. Klein Keane
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