moin moin,

a security flaw was discovered in apt that allows a remote man in the
middle attacker to inject a malicious package that will be installed by
root.

Use '-o Acquire::http::AllowRedirect=false' option for apt tools to
disable the redirect that's vulnerable in order to install the updates.

Also, use upgrade rather than dist-upgrade or full-upgrade for now to
prevent installation of packages that aren't already installed.

In fact, perhaps look at the upgrade list and specifically install the apt
packages from it.

Disabling AllowRedirect has been working for me with both debian and
Ubuntu.

--
  apt -o Acquire::http::AllowRedirect=false update
  apt -o Acquire::http::AllowRedirect=false upgrade
--

https://lists.debian.org/debian-security-announce/2019/msg00010.html

ciao,

der.hans
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