GNU bug report logs - #19350
24.4; Incorrect quoting of %-signs for Windows command shell

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Package: emacs;

Reported by: Demetrios Obenour <demetriobenour <at> gmail.com>

Date: Thu, 11 Dec 2014 18:45:02 UTC

Severity: minor

Tags: confirmed, wontfix

Found in version 24.4

Done: Noam Postavsky <npostavs <at> users.sourceforge.net>

Bug is archived. No further changes may be made.

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Message #29 received at 19350 <at> debbugs.gnu.org (full text, mbox):

From: npostavs <at> users.sourceforge.net
To: Demi Obenour <demiobenour <at> gmail.com>
Cc: 19350 <at> debbugs.gnu.org
Subject: Re: bug#19350: #19350 24.4;
 Incorrect quoting of %-signs for Windows command shell
Date: Sun, 14 Aug 2016 23:13:43 -0400

Demi Obenour <demiobenour <at> gmail.com> writes:

> We don't know what this is being used for. For all we know, someone has written an Emacs plugin that passes a file with an attacker-controlled basename (ex.
> downloaded from the Internet) and uses this function to escape the filename before passing it to an external command, and in a context where there are unbalanced
> double quotes (say) in a known env var. Result: remote execution of arbitrary code.

Hmm, maybe we could fix this by making Emacs refuse to apply environment
variables with names ending in carets?
This bug report was last modified 7 years and 102 days ago.

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