[Bug 1812353] Re: content injection in http method (CVE-2019-3462)

[Christoph Anton Mitterer]

Is there any more detailed evaluation of this hole?

It reads absolutely catastrophic, like that secure APT is basically
broken since 2011,… and if anyone has found that issue before (which one
must assume in the worst case) any code could have been rather easily
introduced in any Debian based system, from end users to DDs.

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Title:
  content injection in http method (CVE-2019-3462)

Status in apt package in Ubuntu:
  In Progress
Status in apt source package in Precise:
  Fix Released
Status in apt source package in Trusty:
  Fix Released
Status in apt source package in Xenial:
  Fix Released
Status in apt source package in Bionic:
  Fix Released
Status in apt source package in Cosmic:
  Fix Released
Status in apt source package in Disco:
  In Progress

Bug description:
  apt, starting with version 0.8.15, decodes target URLs of redirects,
  but does not check them for newlines, allowing MiTM attackers (or
  repository mirrors) to inject arbitrary headers into the result
  returned to the main process.

  If the URL embeds hashes of the supposed file, it can thus be used to
  disable any validation of the downloaded file, as the fake hashes will
  be prepended in front of the right hashes.

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