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Message-ID: <20161102135241.20a8c3c4@pc1>
Date: Wed, 2 Nov 2016 13:52:41 +0100
From: Hanno Böck <hanno@...eck.de>
To: oss-security@...ts.openwall.com
Subject: Re: [SECURITY ADVISORY] IDNA 2003 makes curl use
wrong host
On Wed, 2 Nov 2016 12:53:04 +0100
Robert Scheck <robert@...oraproject.org> wrote:
> On the other hand, I am wondering if this should be really classified
> as a security related issue.
Ambiguitiy in character encodings can often be a source of security
issues.
Just think of the following:
* A Certificate Authority is using different pieces of software that
mix different IDNA encodings.
* I request a certificate for strasse.de, but the verification mail
goes to xn--strae-oqa.de.
* I am the owner of xn--strae-oqa.de and now have a valid certificate
for strasse.de.
IMHO the whole idea of suddenly changing how international domain names
are encoded is a very problematic security violation.
--
Hanno Böck
https://hboeck.de/
mail/jabber: hanno@...eck.de
GPG: FE73757FA60E4E21B937579FA5880072BBB51E42
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