Date: Thu, 11 Mar 2010 16:20:48 +0100 From: Ludwig Nussel <ludwig.nussel@...e.de> To: Brian Stafford <brian@...fford.uklinux.net> Cc: oss-security@...ts.openwall.com, libesmtp@...fford.uklinux.net, security@...ntu.com Subject: Re: CVE Request: libesmtp does not check NULL bytes in commonName Brian Stafford wrote: > [...] > I find myself coming back to RFC 2818 being a reasonable choice since it > is flexible and (almost) clear, and since HTTPS, as a major user of TLS, > is, I assume, well analysed for security implications wrt certificate > validation. More fun: https://bugzilla.mozilla.org/show_bug.cgi?id=159483 > Is it the case that for STARTTLS in SMTP what we are really interested > in is encrypting the data on the wire and authentication is only of > secondary importance? Encryption without authentication makes you prone to MITM. > Do we know what the best current practice is > among CAs when it comes to issuing certificates for STARTTLS? The most common implementation is to just allow the simple form *.something so I'd assume that other patterns are rare in the wild. The last commenter in the aforementioned Mozilla bug says that *.*.appspot.com is actually used by Google though. Anyways, the matching function in libesmtp certainly is good enough. I was just surprised that wildcards at the right hand side are allowed. What about the actual patch I sent though? :-) cu Ludwig -- (o_ Ludwig Nussel //\ V_/_ http://www.suse.de/ SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nuernberg)
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