full-disclosure - Re: FYI: Apache httpd NoFollowSymLink follows symlinks feature

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Message-ID: <BANLkTin=TbN_SdwALiT+NKX1EPaebfqMOQ@mail.gmail.com>
Date: Fri, 24 Jun 2011 17:24:37 +0200
From: Christian Sciberras <uuf6429@...il.com>
To: halfdog <me@...fdog.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: FYI: Apache httpd NoFollowSymLink follows
 symlinks feature

I think you meant "apache follows symlinks even when -FollowSymLinks is *not
* set".
Otherwise it doesn't seem to make sense?

Cheers,
Chris.


On Fri, Jun 24, 2011 at 5:14 PM, halfdog <me@...fdog.net> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> For those, who did not already know:
>
> Due to specification, apache follows symlinks even when -FollowSymLinks
> is set, when the data is modified concurrently. This can be trivially
> shown as demonstrated in
> http://www.halfdog.net/Security/2011/ApacheNoFollowSymlinkTimerace/ .
> When performing host hardening, do not think, the -FollowSymLinks option
> alone will prevent you from symlink attacks.
>
> - --
> http://www.halfdog.net/
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