Date: Fri, 6 Mar 2015 10:09:22 +1100 From: Michael Samuel <mik@...net.net> To: oss-security@...ts.openwall.com Subject: Re: Another Python app (rhn-setup: rhnreg_ks) not checking hostnames in certs properly CVE-2015-1777 Could RedHat ship a new package that replaced python's default SSL library with the one that validates TLS by default and release a RHEA? That way customers (like me) who never want broken TLS on their network can just install a package and it's fixed. Regards, Michael On 6 March 2015 at 05:36, Kurt Seifried <kseifried@...hat.com> wrote: > > > On 05/03/15 10:06 AM, John Haxby wrote: >> PEP 476 cites 11 CVEs that resulted from python not properly validating >> certificates. This would be number 12. >> >> Shouldn't python versions prior to 2.7.9 and 3.4.3 have a CVE each for >> the lack of verification? If internal corporate software stops working >> because of invalid certificates, wasn't it broken anyway? > > So if something is advertised as having a security feature and does not > or it is broken then it gets a CVE. In this case Python, and basically > every other SSL/TLS implementation on the planet, by default, did not > check hostnames in certs, but they did provide that capability should > you choose to use it. So no CVE since it wasn't "meant to be secure" as > I understand it. > > Now for my personal opinion: Doing SSL/TLS with server certs and not > checking the hostname in a server cert is completely insane and utterly > defeats the purpose. However there are cases where a certificate may not > have a hostname field, or need a valid hostname field, e.g. a client > certificate where you mostly care about the fact that the client has it > at all. So I can see why they made hostname checks optional, but again, > I think it was a very bad decision long term as evidenced by: > > http://www.cve.mitre.org/cgi-bin/cvekey.cgi?keyword=certificate+hostname+check > >> jch >> > > -- > Kurt Seifried -- Red Hat -- Product Security -- Cloud > PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 >
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