Date: Wed, 1 Oct 2014 00:03:21 -0400 (EDT) From: "Stuart D. Gathman" <stuart@...hman.org> To: oss-security <oss-security@...ts.openwall.com> Subject: Re: Healing the bash fork On Tue, 30 Sep 2014, Michal Zalewski wrote: > You're describing taint tracking, which is actually a pretty hard > problem when you realize that data isn't an abstract, immutable > entity, but rather something that is used as input for arithmetics, > conditional branches, etc (is a byte set as a result of a tainted > conditional also tainted? for far-reaching should this effect be?). > > But more fundamentally, in your example, what does it prove? In > practical settings, privileged programs will routinely have data from > lower (or at least other) privilege levels in memory, but that doesn't > indicate a security problem. In particular, both the fixed and the > vulnerable versions of bash will have that property when invoked via a servlet. It doesn't "prove" anything, but I thought it could maybe narrow down the code to audit carefully. I figured it had already been done.
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