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Bug 1716563 - GnuTLS doesn't send downgrade sentinels with TLS 1.3 disabled
Summary: GnuTLS doesn't send downgrade sentinels with TLS 1.3 disabled
Keywords:
Status: CLOSED UPSTREAM
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: gnutls
Version: 8.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Daiki Ueno
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-06-03 15:47 UTC by Hubert Kario
Modified: 2021-01-19 15:42 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2021-01-19 15:42:01 UTC
Type: Bug
Target Upstream Version:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Gitlab gnutls/gnutls/issues/734 0 None None None 2019-06-03 15:48:15 UTC

Internal Links: 1686579

Description Hubert Kario 2019-06-03 15:47:28 UTC 
Description of problem:
When the GnuTLS server has TLS 1.3 disabled, connections that negotiate TLS 1.0 or TLS 1.1 will not receive a downgrade sentinel in ServerHello random

Version-Release number of selected component (if applicable):
gnutls-3.6.8-1.el8

How reproducible:
always

Steps to Reproduce:
1. gnutls-serv --priority @SYSTEM:-VERS-TLS1.3 ...
2. tlsfuzzer/scripts/test-downgrade-protection.py --server-max-protocol=TLSv1.2
3.

Actual results:
AssertionError: Server failed to set downgrade protection sentinel in ServerHello.random value


Expected results:
test pass

Additional info:
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