emacs -- remote code execution vulnerability

Chong Yidong reports:

Paul Ling has found a security flaw in the file-local
variables code in GNU Emacs.
When the Emacs user option enable-local-variables' is set to :safe’ (the default value is t), Emacs should
automatically refuse to evaluate eval' forms in file-local variable sections. Due to the bug, Emacs instead automatically evaluates such eval’ forms. Thus, if the user
changes the value of enable-local-variables' to :safe’,
visiting a malicious file can cause automatic execution of
arbitrary Emacs Lisp code with the permissions of the
user.
The bug is present in Emacs 23.2, 23.3, 23.4, and
24.1.