[As usual when I write here, the header From: is a black hole. Use the
address in the signature to actually reach me.]

>> this only works if the user un-zipping the file is already root.
>> otherwise it creates an "sh" binary which is setuid to the user who
>> unzipped the file.
> If your homedir is worldreadable, which is pretty common practice the
> other user can run the shell and get your useraccount.

This is confusing readable with executable.

If a directory is readable, anyone can find out the names of the things
in it. If it's executable, anyone who knows a thing's name there can
get to the thing.

Read and execute access usually go together on directories, but they
don't have to. (A +r-x directory is of doubtful use. But -r+x is
comparatively useful.)

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