Follow @Openwall on Twitter for new release announcements and other news
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 26 Sep 2014 12:26:05 -0600
From: Kurt Seifried <>
Subject: Re: Re: CVE-2014-6271: remote code execution through
 bash (3rd vulnerability)

On 26/09/14 12:12 PM, Rich Felker wrote:
> On Fri, Sep 26, 2014 at 02:06:21PM +0100, Simon McVittie wrote:
>>> Tell everyone to stop using setuid/setgid now and forever?
> Yes!
>> Minimizing use of setuid/setgid, and making sure the setuid/setgid
>> things are suitably hardened, is a good idea. However, tools for
>> controlled privilege escalation (sudo, pkexec, Apache suexec) rely on
>> setuid in order to work. There's a reason the feature exists at all.
> These could all be done by having the process with root privileges
> inherit them from a daemon parent that already has root, rather than
> requiring the kernel to elevate the privileges of a process via the
> setuid bit. This inherently eliminates all attacker control of the
> process's initial state and limits the input/attack surface to the
> communication channel clients have with the daemon (e.g. a single unix
> socket).

setuid/setgid is not just for root. For example the Postfix server makes
use of various groups and setuid/setgid binaries and directories so that
there are well defined interfaces between Postfix components that run
with different privilege levels.

Kurt Seifried -- Red Hat -- Product Security -- Cloud
PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)

Powered by blists - more mailing lists

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.