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Is the Trinity Desktop Environment Secure?
(www.trinitydesktop.org)
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Oh damn, so just viewing a file in your file manager is enough to get infected in an insecure desktop environment, as thumbnails can be generated programmatically? If I clicked a bad link that would 100% infect my system.
I'm not worried too much about screen-capture. I'm worried first and foremost about triggering any arbitrary code execution and thumbnail generation on a file would definitely do it.
It depends on what file manager you use. In many, you can turn off thumbnail generation if you believe this might happen to you.