[Bug 1803441] Re: BASH_CMDS is writable in restricted bash shells (fixed upstream, need to backport patch)

[Riccardo Schirone]

After looking a bit more into this, it seems the issue in
https://lists.gnu.org/archive/html/bug-bash/2017-12/msg00065.html is
maybe not a real security concern, since rbash was wrongly configured.
Having . in PATH is not good with rbash and that makes the whole thing
flawed. So, we could say CVE-2019-9924 is just for the issue in
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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