How to Use JavaScript Injections

Carbone

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posted on 17 years ago — updated on 1 second ago

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JavaScript injection is a process by which we can insert and use our own JavaScript code in a page, either by entering the code into the address bar, or by finding an XSS vulnerability in a website. Note that the changes can only be seen by you and are not permanent. This is because JavaScript is a "client-side" language.

Steps

You must enter the code in the URL address bar of the window. Try these injections: Note - If you use Firefox, you will have to use another way, like cmd-shift-k on a Mac javascript:alert("Hello!"); To bring up an alert box saying "Hello!":

javascript:alert("Hello"); alert("World"); To bring up 2 alert boxes, the one in the front will say "Hello" and once you click OK, the one saying "World" will appear:

javascript:alert(document.forms[0].to.value="something") To change the value of form [0] to something:

javascript:void(document.bgColor="blue") To change the background color to blue. You can put any other color in the place of blue to change it to a different color:

javascript:alert("The actual url is:\t\t" + location.protocol + "//" + location.hostname + "/" + "\nThe address URL is:\t\t" + location.href + "\n" + "\nIf the server names do not match, this may be a spoof."); To see the real server name of the site you are looking at. You should use it if you think that you are viewing a spoofed website, or anytime just to make sure:

javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.images; DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=Math.sin(R*x1+i*x2+x3)*x4+x5; DIS.top=Math.cos(R*y1+i*y2+y3)*y4+y5}R++}setInterval('A()',5); void(0); To make pictures fly around. Make sure to find a site like Google Images so there are more pictures!(If you press the refresh button, it goes really fast, but might only work with macOS):

javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.images; DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=Math.cos(R*x1+i*x1+x2)*x4+x5; DIS.top=Math.cos(R*y1+i*y2+y3)*y4+y5}R++}setInterval('A()',5); void(0); To spin circle of pictures. It funnels the pictures in a snake-like motion: