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May 14, 2012 at 19:10 comment added dr jimbob (Granted I'm sure some applications will automatically download data in an insecure manner that potentially could be used for an attack somehow; and I'm not sure how windows does auto updating applications; would not be the least bit surprised if no signing protocol is required by the developer or if any installed application could just silently update itself.)
May 14, 2012 at 19:06 comment added dr jimbob In linux/unix, this isn't a risk as updating system-wide software generally (a) requires super-user permissions and (b) goes through a package-manager/repository that checks for valid, trusted cryptographic signatures on everything. So unless the attacker has already compromised the repository you trust (or tricked you into trusting a bad repo), the threat you mention is non-existent (and if they have they can just push bad packages in the trusted repo). Even simple web-browser/android/iOS add-ons/apps use strong cryptographical signatures that is checked before installing an update.
May 14, 2012 at 14:36 history edited curiousguy CC BY-SA 3.0
more on cookies, f.ex. Google identity
May 14, 2012 at 14:30 history edited curiousguy CC BY-SA 3.0
added second answer
May 14, 2012 at 14:12 history answered curiousguy CC BY-SA 3.0