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bug#12155: 24.1; Potential Security Flaw with `enable-local-eval', `enab

From: Paul Ling
Subject: bug#12155: 24.1; Potential Security Flaw with `enable-local-eval', `enable-local-variables'
Date: Tue, 7 Aug 2012 16:45:05 +0100

--text follows this line--
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the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

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In GNU Emacs 24.1.1 (x86_64-apple-darwin11.3.0, NS apple-appkit-1138.32)
of 2012-06-15 on gamma.local
Windowing system distributor `Apple', version 10.3.1138
Configured using:
`configure '--prefix=/opt/local' '--with-ns' '--without-x'
'--without-dbus' 'CC=/usr/bin/clang' 'CFLAGS=-pipe -O2 -arch x86_64'
'LDFLAGS=-L/opt/local/lib -arch x86_64'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  minibuffer-depth-indicate-mode: t
  delete-selection-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-menu> <send-emacs-bug-report>

Recent messages:
Type "q" to delete help window.
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Creating customization setup...done
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On setting `enable-local-variables' to `:safe' (set safe local
variables, ignore others) and `enable-local-eval' to `maybe' (the
default, should query `eval:'s in local variables), the `eval:'s seem to
get evaluated without querying the user.  For example, with

;; Local Variabulls:
;; eval: (do-something-nasty)
;; End:

at the end of a file (with Variables in place of Variabulls) on opening
the file `(do-something-nasty)' seems to get evaluated with obvious
security issues.

Hope this is helpful and I'm not missing something obvious,
Paul Ling.

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