[Bug 1411318] Re: arbitrary code execution

[Phillip Sz]

"<kurahaupo> [22:16:18] phillip: anything on Woolledge's Wiki can be assumed to be known to Chet, yes
<kurahaupo> phillip: the loop reference problem is potentially fixable; the code-in-referents is not, at least not without breaking existing code somewhere, which is a no-no" I reported this here, so that someone maybe checks if this bug, can influence ubuntu's security.

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https://bugs.launchpad.net/bugs/1411318

Title:
  arbitrary code execution

Status in bash package in Ubuntu:
  Confirmed

Bug description:
  "The problem with bash's name references

  Bash 4.3 introduced declare -n ("name references") to mimic Korn
  shell's nameref feature, which permits variables to hold references to
  other variables (..). Unfortunately, the implementation used in Bash
  has some issues.

  {…} Bash's name reference implementation still allows arbitrary code
  execution:

  $ foo() { declare -n var=$1; echo "$var"; }
  $ foo 'x[i=$(date)]'
  bash: i=Thu Mar 27 16:34:09 EDT 2014: syntax error in expression (error token is "Mar 27 16:34:09 EDT 2014")

  It's not an elegant example, but you can clearly see that the date
  command was actually executed. This is not at all what one wants."

  source: http://mywiki.wooledge.org/BashFAQ/048

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