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Anybody can also spoof DNS entries to point rubygems.org/debian.org/centos.org/redhat.com to a malicious place where the packages contain postinstall scripts that run 'rm -rf /'.

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Maybe for rubygems, not so easy for apt/rpm as they use gpg signing/verification of package indices.

RubyGems also have signing facilities. Most authors don't bother signing however because generating a key is too much trouble.

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