I don't think they are the same issue. Or, at least, the first issue was
only partially fixed. I can see both Fedora 29 and Ubuntu 18.10 being
still affected by the issue outlined in
https://lists.gnu.org/archive/html/bug-bash/2017-12/msg00065.html,
though they are not affected by https://lists.gnu.org/archive/html/bug-
bash/2017-03/msg00077.html.

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https://bugs.launchpad.net/bugs/1803441

Title:
  BASH_CMDS is writable in restricted bash shells (fixed upstream, need
  to backport patch)

Status in bash package in Ubuntu:
  New

Bug description:
  In 14.04 LTS, the BASH_CMDS variable is writable in rbash. This allows
  a trivial escape from rbash to run arbitrary shell commands.

  This issue is fixed upstream:
  http://git.savannah.gnu.org/cgit/bash.git/tree/CHANGES?h=bash-4.4-testing#n65

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