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Date: Tue, 16 Mar 2010 16:56:15 +0300
From: ArkanoiD <ark@...ex.net>
To: oss-security@...ts.openwall.com
Cc: Brian Stafford <brian@...fford.uklinux.net>, libesmtp@...fford.uklinux.net,
        security@...ntu.com, Pawel Salek <pawsa@...ochem.kth.se>,
        jskarvad@...hat.com
Subject: Re: CVE Request: libesmtp does not check NULL bytes in commonName

And according to the draft we MUST ignore non-leaf value even if
it is the only one CN, just incorrectly placed.

On Tue, Mar 16, 2010 at 02:41:52PM +0100, Peter Sylvester wrote:
> 
> >
> >Doesn't that lack a null byte check for subjAltNames?
> >
> 
> The patch seems broken to me:
> X509_NAME_get_text_by_NID gets the "highest" one, not the leaf value.
> In case of two common names, this is wrong.
> 
> So instead of
> int l = X509_NAME_get_text_by_NID (X509_get_subject_name (cert),
>                             NID_commonName, buf, sizeof buf);
> 
> one needs something like:
> 
>    X509_NAME *name = X509_get_subject_name(cert) ;
>     if(name)
>       while((j=X509_NAME_get_index_by_NID(name,NID_commonName,i))>=0)
>         i=j;
> 
> 
> 
> 
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