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Date: Wed, 4 Mar 2015 13:14:15 -0500
From: Donald Stufft <>
Subject: Re: Another Python app (rhn-setup: rhnreg_ks) not checking hostnames in certs properly CVE-2015-1777

> On Mar 4, 2015, at 12:55 PM, Kurt Seifried <> wrote:
> Jan Bee of the Google Security Team reports:
> The /usr/sbin/rhnreg_ks fails to properly validate hostnames in
> certificates. This can result in man in the middle attacks.
> ===
> Please note that this issue cannot easily be exploited to cause any
> significant damage to a system other then preventing registration from
> taking place properly which the attacker would be able to do in any
> event if the can man in the middle the connection.
> --
> Kurt Seifried -- Red Hat -- Product Security -- Cloud
> PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

Note: Python 2.7.9+ and 3.4.3+ will cause most apps like this to
automatically start validating hostnames. It may be easier to backport
those changes than to find every Python app that doesn’t check hostnames.

Donald Stufft
PGP: 7C6B 7C5D 5E2B 6356 A926 F04F 6E3C BCE9 3372 DCFA

Download attachment "signature.asc" of type "application/pgp-signature" (802 bytes)

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