Bug 1388932

Summary: gnutls: interoperability issue 3.3.x vs. 3.5.5
Product: Red Hat Enterprise Linux 7 Reporter: Nikos Mavrogiannopoulos <nmavrogi>
Component: gnutlsAssignee: Nikos Mavrogiannopoulos <nmavrogi>
Status: CLOSED ERRATA QA Contact: Alicja Kario <hkario>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.4CC: hkario, mgrepl, szidek
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: gnutls-3.3.26-1.el7 Doc Type: If docs needed, set a value
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Last Closed: 2017-08-01 08:48:22 UTC Type: Bug
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Bug Blocks: 1377248    

Description Nikos Mavrogiannopoulos 2016-10-26 13:44:45 UTC 
Description of problem:
Originally reported at:
https://lists.gnupg.org/pipermail/gnutls-devel/2016-October/008209.html

... That said I also reproduced the issue; the fault is with the older
version, as it requires a CertificateStatus message if ServerHello
included the (empty) "status_request" extension, although RFC 6066
explicitly states:

   Note that a server MAY also choose not to send a "CertificateStatus"
   message, even if has received a "status_request" extension in the
   client hello message and has sent a "status_request" extension in the
   server hello message.

So the new gnutls code doesn't do anything wrong by replying with an
empty "status_request" extension, even if there is no chance of sending
a CertificateStatus message, just the old versions can't handle it.

The new version handles this by passing optional = 1 in the call to
_gnutls_recv_handshake(GNUTLS_HANDSHAKE_CERTIFICATE_STATUS) in
status_request.c.
Comment 5 errata-xmlrpc 2017-08-01 08:48:22 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2017:2292