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[Launchpad Bug Tracker <1812353@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package apt - 1.8.0~alpha3.1

---------------
apt (1.8.0~alpha3.1) unstable; urgency=emergency

  * SECURITY UPDATE: content injection in http method (CVE-2019-3462)
    (LP: #1812353)

 -- Julian Andres Klode <jak@xxxxxxxxxx>  Tue, 22 Jan 2019 19:52:38
+0100

** Changed in: apt (Ubuntu Disco)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1812353

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

Status in apt package in Ubuntu:
  Fix Released
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:
  Fix Released

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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