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Re: Re: Yubiserver package ships with pre-filled identities
From: Nanakos Chrysostomos <nanakos () wired-net gr>
Date: Mon, 30 Jan 2012 23:32:12 +0200


On 30 Ιαν 2012, at 19:08, Kurt Seifried <kseifried () redhat com> wrote:

On 01/30/2012 04:56 AM, Jonathan Wiltshire wrote:
On 2012-01-30 06:43, Nanakos Chrysostomos wrote:
Hi again,
I found another reason for not shipping the package with an example
account. I think you are certainly right. If you haven't filled a bug please do so, in the meanwhile I will upload to mentors a new version
with an empty database that resolves the problem. Thanks.

This populated database is also shipped in the upstream tarball,
oss-security should be consulted to see whether a CVE identifier should
be issued.

Adding to CC; oss-sec please see below:


On 30 Ιαν 2012, at 1:25, Gian Piero Carrubba <gpiero () rm-rf it> w rote:

Hi Nanakos,

thanks for your prompt response.

* [Sun, Jan 29, 2012 at 11:19:37PM +0200] Nanakos Chrysostomos:
those keys are invalid and are not my real keys. It's just a sample
for the potential users of the package to see.

Ok I'm not clear on what is going on here, is there a link to the bug
entry regarding this issue, or can someone clarify it?


Hi,
there is no bug entry yet.


1) are there default accounts shipped with the product that get
activated automatically during install? (it sounds like yes?)


Yes. The database is populated with an example/test account which is activated during install.


2) can someone remotely/locally access these accounts? what are the
credentials for these accounts ("invalid keys"?), can an attacker access
them?


If someone programs or uses a software emulation for the yubikey can have access to whatever the user of the application uses it for ( the yubiserver). For example if someone uses Pam yubico module with the su or sshd server to provide a two factor authentication scheme he should suffer from this security issue if he hasn't deleted or deactivated the test account. If someone by mistake installs yubiserver and doesn't use him to validate his otp or hmac otp, he won't suffer from this security issue. Someone can only suffer if he uses the server and hasn't deleted or deactivated the test account which is shipped with the server.

3) what is the privilege level of the accounts?

That depends on how someone wants to use the server and the privilege level that he wants to give to it's users through the validation of the otp or hmac otp.

Chris.



--
Kurt Seifried Red Hat Security Response Team (SRT)


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