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Chrome Bug Permits Webpages to Change Clipboard Contents

By Ionut Arghire on September 01, 2022

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A vulnerability in Google Chrome – and in all Chromium-based browsers – permits webpages to interchange the contents of the system clipboard with out the person’s consent or interplay.

The difficulty exists as a result of the browser doesn’t have the mandatory safeguards to forestall websites from writing to the clipboard.

In keeping with developer Jeff Johnson, the bug was launched in Chrome 104, when a requirement for a person gesture to repeat content material to the clipboard was damaged.

Due to that, when a person visits a specifically crafted webpage, the content material of the system clipboard could also be changed with content material outlined on that web page.

The identical difficulty is current in Firefox and Safari as properly, the developer says. Nonetheless, whereas the bug will be triggered in Chrome with out person interplay, some type of gesture is required to take advantage of it in Firefox and Safari.

In keeping with Johnson, when on the crafted web page, if the person triggers a ‘copy’ or ‘minimize’ command, clicks on a hyperlink, or just scrolls down or up (utilizing both the mouse or the keyboard), the web page is granted the permission to overwrite the system clipboard.

The developer has created a demo webpage to showcase the vulnerability. SecurityWeek was capable of confirm the problem on the latest Chrome launch (model 105), however couldn’t reproduce it in Firefox.

“The potential for maliciousness must be apparent. Whilst you’re navigating an online web page, the web page can with out your data erase the present contents of your system clipboard, which can have been useful to you, and exchange them with something the web page needs, which could possibly be harmful to you the subsequent time you paste,” the developer notes.

Cybercriminals have been noticed focusing on the clipboard content material in assaults meant to hijack a sufferer’s cryptocurrency transactions. As a part of such assaults, malware is usually used to interchange within the clipboard a crypto pockets deal with with that of a pockets managed by the attackers.

Johnson says he has additionally checked whether or not a webpage could possibly learn the content material of the clipboard with arbitrary gestures, however that the outcomes of his assessments had been detrimental. A ‘clipboard-read’ permission must be granted earlier than that.

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