11/30/2009: Plug A Security Hole in RubyGems By Mailing Ruby Install Dir ReadOnly!
When creating a Ruby gem, developers can specify a list of executable files. These executives are copied into the same directory where the Ruby binary is located. While very convenient, it opens a huge security hole.
It would be fairly easy for someone to provide an alternate version of the Ruby executable.
If possible, write-protect your ruby install directory to prevent this avenue of attack. If you run Windows and are paranoid, backup the Ruby install directory so you have something for future comparison.
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