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

[Launchpad Bug Tracker]

This bug was fixed in the package bash - 4.3-14ubuntu1.4

---------------
bash (4.3-14ubuntu1.4) xenial-security; urgency=medium

  * SECURITY UPDATE: rbash restriction bypass (LP: #1803441)
    - debian/patches/CVE-2019-9924.patch: if the shell is restricted,
      reject attempts to add pathnames containing slashes to the hash table
      in variables.c.
    - CVE-2019-9924

 -- Marc Deslauriers <marc.deslauriers at ubuntu.com>  Fri, 12 Jul 2019
14:25:28 -0400

** Changed in: bash (Ubuntu)
       Status: New => Fix Released

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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:
  Fix Released

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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