⚠ Possible to reconstruct cropped screenshots taken on Android & Windows

Due to a wrong implementation of the cropping feature and the use of compression, it is possible to reconstruct cropped screenshots taken on an Android phone.

e.g. one screenshots some app with private information and crops out the private data. With an automatic tool it is possible to reconstruct the full image including the private information.

Avoid directly sharing cropped images that had some private information.

https://www.da.vidbuchanan.co.uk/blog/exploiting-acropalypse.html

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What if someone screenshots a cropped image?
screenshot → crop → screenshot
I guess that would be safe, no?

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Yes, that should fix it as the image is re-encoded and saved in a new compression data stream

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Obviously that’s not the same case, there’s no problem with that.

Not so obvious, that’s why I asked :wink:

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The March 2023 update is out for all Pixel phones which fixes this issue.

Basically confirming what I already feared :smiling_face_with_tear:

Microsoft is not any better than Google in that regard.
Same cropping issue with Windows Snip & Sketch Tool.

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Same behavior happens with JFIF files too

this is… so fucking weird.