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Just as an aside - is there a particular reason you specify the type of the filesystem? Is there something specific to FAT that might make this exploit viable? I'm thinking permissions, but I'm not sure.

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I think it's that all files have mode 0777, i.e. executable by default. I think it can be changed with mount options though.

Thanks a lot, I was discussing this with a friend and we reached this conclusion too.

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