Re: ?Minor Security Issue - DNS, /etc/hosts, freebsd-update, ?pkg

"J. Hellenthal via freebsd-security" <[email protected]> Fri, 5 Jul 2019 12:22:43 -0500

Newsgroups	gmane.os.freebsd.security.general
Message-ID	<[email protected]>

And in what revision besides an administrators local modifications
suggest that those werre ever a part of the source trree ?


For reference ...
https://svnweb.freebsd.org/base/stable/11/etc/hosts?view=log


Quite frankly the FreeBSD source committers are much more knowledged
thann your insight suggests...

Facts plz ...



On Thu, Jul 04, 2019 at 10:18:16AM -0400, Walter Cramer wrote:
> Suspected severity:  Low.  Systems with inattentive administrators may not
> receive the latest updates, and no obvious error messages will point out the
> problem.
> 
> Situation discovered in:  A few older 11.2-RELEASE FreeBSD systems, with
> /etc/hosts entries like this:
> 
> 96.47.72.72	ftp.freebsd.org
> 96.47.72.71	pkg.freebsd.org
> 
> (Those are now obsolete.  Originally, they were added to simplify firewall
> rules and rule-loading, and as a DNS hijack defense.)
> 
> Resulting problem:  `freebsd-update fetch` sometimes "sees" the latest
> (11.2-RELEASE-p11) version of 11.2.  Other times, it "sees" the older
> 11.2-RELEASE-p10.  So, if a sysadmin relied on `freebsd-update` to tell him
> when systems needed updating, he could be unaware of un-patched, vulnerable
> systems.
> 
> NOT verified:  Whether the obsolete /etc/hosts entry for pkg.freebsd.org
> actually causes any problems.  (Or if `pkg` is aware of the problem, and
> silently doing all the right things.)
> 
> Suggested Fixes...
>  - Have `freebsd-update`, `pkg`, and similar utilities double-check for DNS
> information that is obsolete or conflicting, and warn the user.
>  - Have any obsolete - but still-active - pkg or update servers advertise
> their obsolete status, and `freebsd-update` and `pkg` notice that, and warn
> the user.
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