Bug 1791225 (CVE-2019-17023) - CVE-2019-17023 nss: TLS 1.3 HelloRetryRequest downgrade request sets client into invalid state
Summary: CVE-2019-17023 nss: TLS 1.3 HelloRetryRequest downgrade request sets client i...
Keywords:
Status: NEW
Alias: CVE-2019-17023
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1791228 1791229
Blocks: 1790871
TreeView+ depends on / blocked
 
Reported: 2020-01-15 09:25 UTC by Huzaifa S. Sidhpurwala
Modified: 2020-01-21 15:57 UTC (History)
6 users (show)

Fixed In Version: nss 3.49
Doc Type: If docs needed, set a value
Doc Text:
A protocol downgrade flaw was found in Network Security Services (NSS). After a HelloRetryRequest has been sent, the client may negotiate a lower protocol than TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored.
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Description Huzaifa S. Sidhpurwala 2020-01-15 09:25:50 UTC
As per upstream:

After a HelloRetryRequest has been sent, the client may negotiate a lower protocol that TLS 1.3, resulting in an invalid state transition in the TLS State Machine. If the client gets into this state, incoming Application Data records will be ignored.

Upstream bug: https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2019-17023 (currently private)

Comment 1 Huzaifa S. Sidhpurwala 2020-01-15 09:25:54 UTC
External References:

https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.49_release_notes

Comment 2 Huzaifa S. Sidhpurwala 2020-01-21 10:12:14 UTC
Statement:

This flaw causes the client to hang when there is a downgrade attempt. Therefore no actual protocol downgrade occurs.


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