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Date: Wed, 29 Jan 2014 15:02:07 +0100
From: Raphael Geissert <geissert@...ian.org>
To: oss-security@...ts.openwall.com
Cc: Jakub Wilk <jwilk@...ian.org>, 736958@...s.debian.org
Subject: Re: CVE request: temporary file issue in Passenger rubygem
On 29 January 2014 09:57, Raphael Geissert <geissert@...ian.org> wrote:
[...]
> One thing to notice, however, is that there's a race condition between
> the stat check introduced in 34b1087870c2.
> The following sequence still triggers the bogus behaviour:
>
> <user> mkdir $dir
> <phusion> lstat() (getFileTypeNoFollowSymlinks)
> <user> rmdir $dir
> <user> ln -s /target $dir
> <phusion> stat() (from verifyDirectoryPermissions)
> ...
Upstream has now fixed this with the following commit (basically using
the structure from lstat() for the two checks):
https://github.com/phusion/passenger/commit/94428057c602da3d6d34ef75c78091066ecac5c0
Cheers,
--
Raphael Geissert - Debian Developer
www.debian.org - get.debian.net
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