Re: Digicert issued certificate with let's encrypts public key

2020-05-16 Thread Peter Gutmann via dev-security-policy
Kurt Roeckx via dev-security-policy  
writes:

>Browsing crt.sh, I found this: https://crt.sh/?id=1902422627
>
>It's a certificate for api.pillowz.kz with the public key of Let's Encrypt
>Authority X1 and X3 CAs.

How could that have been issued?  Since a (PKCS #10) request has to be self-
signed, does this mean Digicert aren't validating signatures on requests?

Peter.
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Re: Digicert issued certificate with let's encrypts public key

2020-05-16 Thread Ryan Sleevi via dev-security-policy
On Sat, May 16, 2020 at 10:11 AM Kurt Roeckx via dev-security-policy <
dev-security-policy@lists.mozilla.org> wrote:

> On Sat, May 16, 2020 at 10:04:24AM -0400, Andrew Ayer via
> dev-security-policy wrote:
> > On Sat, 16 May 2020 14:02:42 +0200
> > Kurt Roeckx via dev-security-policy
> >  wrote:
> >
> > > https://crt.sh/?id=1902422627
> > >
> > > It's a certificate for api.pillowz.kz with the public key of Let's
> > > Encrypt Authority X1 and X3 CAs.
> > >
> > > It's revoked since 2020-01-31, but I couldn't find any incident
> > > report related to it.
> >
> > Hi Kurt,
> >
> > It's not obvious what's non-compliant about this certificate - could you
> > explain?  Note that there is no requirement or security need for CAs to
> > validate proof of possession of a private key.
>
> I was under the impression that there was. But looking at the BRs,
> 3.2.1 is just empty.


Yeah, that’s intentional, at least with regards to server certificates, as
it is not necessary for such certificates.

As Andrew mentioned, there are no requirements here and it’s not a
violation of any expectation, in the Baseline Requirements or in any Root
Programs’ policies.

>
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Re: Digicert issued certificate with let's encrypts public key

2020-05-16 Thread Kurt Roeckx via dev-security-policy
On Sat, May 16, 2020 at 10:04:24AM -0400, Andrew Ayer via dev-security-policy 
wrote:
> On Sat, 16 May 2020 14:02:42 +0200
> Kurt Roeckx via dev-security-policy
>  wrote:
> 
> > https://crt.sh/?id=1902422627
> > 
> > It's a certificate for api.pillowz.kz with the public key of Let's
> > Encrypt Authority X1 and X3 CAs.
> > 
> > It's revoked since 2020-01-31, but I couldn't find any incident
> > report related to it.
> 
> Hi Kurt,
> 
> It's not obvious what's non-compliant about this certificate - could you
> explain?  Note that there is no requirement or security need for CAs to
> validate proof of possession of a private key.

I was under the impression that there was. But looking at the BRs,
3.2.1 is just empty.


Kurt

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Re: Digicert issued certificate with let's encrypts public key

2020-05-16 Thread Andrew Ayer via dev-security-policy
On Sat, 16 May 2020 14:02:42 +0200
Kurt Roeckx via dev-security-policy
 wrote:

> https://crt.sh/?id=1902422627
> 
> It's a certificate for api.pillowz.kz with the public key of Let's
> Encrypt Authority X1 and X3 CAs.
> 
> It's revoked since 2020-01-31, but I couldn't find any incident
> report related to it.

Hi Kurt,

It's not obvious what's non-compliant about this certificate - could you
explain?  Note that there is no requirement or security need for CAs to
validate proof of possession of a private key.  Therefore, it's
entirely acceptable for a subscriber to request a certificate for
someone else's public key, although the certificate would be useless to
them.

Regards,
Andrew
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Digicert issued certificate with let's encrypts public key

2020-05-16 Thread Kurt Roeckx via dev-security-policy
Hi,

Browsing crt.sh, I found this:
https://crt.sh/?id=1902422627

It's a certificate for api.pillowz.kz with the public key of Let's
Encrypt Authority X1 and X3 CAs.

It's revoked since 2020-01-31, but I couldn't find any incident
report related to it.


Kurt

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