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Date: Wed, 17 Mar 2010 16:26:16 +0300
From: ArkanoiD <>
Cc: Brian Stafford <>,,, Pawel Salek <>,
Subject: Re: CVE Request: libesmtp does not check NULL bytes in commonName

Formally, they are not. But de facto they are there for a long time.

On Wed, Mar 17, 2010 at 02:23:22PM +0100, Ludwig Nussel wrote:
> Brian Stafford wrote:
> > Since both the original and patched versions of match_component() 
> > implement wildcards rather less liberally than RFC 2818 implies, I 
> > decided to move towards the approach in the I-D.  match_component() now 
> > accepts either a string or a single wildcard '*'.  Matched characters 
> > are validated against the set of valid domain name component characters 
> > , that is, * will not match, nor for that 
> > matter will the pattern  Question: should underline '_' 
> > be in the set of valid characters?
> AFAIK underlines are not allowed in DNS. I'm sure someone knows the
> RFC for that too :-)

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