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Date: Thu, 03 Jul 2014 17:21:59 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com, cve-assign@...re.org
Subject: Re: Varnish - no CVE == bug regression

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On 03/07/14 02:17 PM, Stefan B├╝hler wrote:
> On Thu, 03 Jul 2014 13:41:58 -0600 Kurt Seifried
> <kseifried@...hat.com> wrote:

>> That also sounds like it needs a CVE then. You should not be able
>> to trivially DoS stuff, especially OOM, things should protect
>> themselves from OOM'ing especially if they accept user controlled
>> input from the network.
> 
> And again "user controlled input"... a root shell also uses "user 
> controlled input".

No because there is no trust boundary violation. If the root user is
logged in at a terminal executing command as root, that's fine. If a
non root user who is not authorized (e.g. via sudo or a setuid
program) is logged in and executing stuff as root, that's a trust
boundary violation.

In this case it's pretty simple: the back end web servers are NOT
supposed to be able to shut down the varnish cache server (if this was
supposed to happen you'd have built a proper channel to do so). That
they can do so means it is a denial of service, and therefore a trust
boundary violation. Ergo it needs a CVE.

> regards, Stefan


- -- 
Kurt Seifried -- Red Hat -- Product Security -- Cloud
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