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Date: Mon, 29 Sep 2014 12:39:03 -0500
From: "Kobrin, Eric" <>
To: "" <>
CC: Florian Weimer <>, Tavis Ormandy <>,
	"" <>, Michal Zalewski
	<>, Solar Designer <>
Subject: Re: Healing the bash fork

On Sep 29, 2014, at 11:59 AM, Eric Blake <> wrote:

> But I see no reason to move away from %% suffixing.

The suffix fixes the obvious CGI hole, but it leaves exposed programs in which the adversary gets to choose the variable name as well.

env $'BASH_FUNC_foo%%=() { echo 123\n }' bash -c "foo"

I think that a more robust solution, such using a separate store for functions, is needed if function import is to survive as a feature.

-- Eric Kobrin

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