- I. Injection Basics
- II. Cookie Editing
- III. Form Editing
I. Injection Basics
You should get a dialog box that says "Hello, World". This will be altered later to have more practical uses.
You can also have more than one command run at the same time.
This would pop up a box that said 'Hello' and than another that says 'World'.
II. Cookie Editing
First off, check to see if the site you are visiting has set any cookies by using this script.
This will pop up any information stored in the sites cookies. To edit any information, we make use of the void(); command.
This command can either alter existing information or create entirely new values. Replace "Field" with either an existing field found using the alert(document.cookie); command, or insert your very own value. Then replace "myValue" with whatever you want the field to be. For example.
Would either make the field "authorized" or edit it to say "yes"... now whether or not this does anything of value depends on the site you are injecting it on.
It is also useful to tack an alert(document.cookie); at the end of the same line to see what effect your altering had.
III. Form Editing
Every form on a given webpage (unless named otherwise) is stored in the forms[x] array... where "x" is the number, in order from top to bottom, of all the forms in a page. Note that the forms start at 0, so the first form on the page would actually be 0, and the second would be 1 and so on. Lets take this example.
<input type="hidden" name="to" value="firstname.lastname@example.org">
Note: Since this is the first form on the page, it is forms
Say this form was used to email vital server information to the admin of the website. You can't just download the script and edit it because the submit.php page looks for a referer. You can check to see what value a certain form element has by using this script.
This is similar to the alert(document.cookie); discussed previously. In this case, It would pop up an alert that says "email@example.com"
So here's how to Inject your email into it. You can use pretty much the same technique as the cookies editing shown earlier.
This would change the email of the form to be "firstname.lastname@example.org". Then you could use the alert(); script shown above to check your work. Or you can couple both of these commands on one line. Submitting this form would now email the new injected email address.
Tutorial by Raduce