Issue #15561 has been updated by Ben Jones.

+1 for hoping this was going to be fixed in 2.7.19. This bit us just as we were 
migrating to use our own CA.
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Bug #15561: Fix for CVE-2012-3867 is too restrictive
https://projects.puppetlabs.com/issues/15561#change-69862

Author: Dustin Mitchell
Status: Accepted
Priority: Normal
Assignee: 
Category: SSL
Target version: 2.7.x
Affected Puppet version: 2.7.18
Keywords: certificate
Branch: 


The fix for CVE-2012-3867 involves checking certificate subjects for "weird" 
characters.  From my read of the CVE entry, this is to filter out characters 
that would cause the name to display in a manner visually indistinguishable 
from a valid hostname.

However, the check is too restrictive:

Could not retrieve catalog from remote server: Certname "puppetagain base 
ca/emailaddress=rele...@mozilla.com/ou=release engineering/o=mozilla, inc." 
must not contain unprintable or non-ASCII characters

In particular, / is a very common character in subjects, and should be allowed. 
 Puppet is seeing this subject on my base CA - I'm using certificate chaining.

The fix is one character, so I haven't included a patch, but I'm happy to make 
a pull req if necessary.

Another fix would be to only verify certificate subjects for the leaf 
certificate, and not any of the certs in its signing chain, but that seems less 
secure.

It's also worth noting that the regex is overly broad, since it downcases the 
string, then accepts A-Z among other characters.


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