Public bug reported:

 affects ubuntu

Ubuntu has improperly configured their TLS. So improper that everything BUT
their downloads are secured with TLS.

This poses a serious risk to all non-APT users (majority of the people on
this planet), as the checksums and ISO files are exposed over HTTP, and can
be modified by MITM attackers, ISPs, and basically any node in the route.

Please see my proof of concept here: https://twitter.com/yungtravla/status/
1013275701078683648

*Problem identified on 30/06/2018 by Yarwin Kolff*

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1779524

Title:
  Insecure Ubuntu repos pose risk to all non-APT users

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