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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