CVE-2019-17023

Published: 8 January 2020

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. This vulnerability affects Firefox < 72.

Notes

Author	Note
mdeslaur	nss in xenial is built with NSS_DISABLE_TLS_1_3, so this issue doesn't affect it.

Priority

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package	Release	Status
firefox Launchpad, Ubuntu, Debian	bionic	Released (72.0.1+build1-0ubuntu0.18.04.1)
	disco	Released (72.0.1+build1-0ubuntu0.19.04.1)
	eoan	Released (72.0.1+build1-0ubuntu0.19.10.1)
	focal	Released (72.0.1+build1-0ubuntu1)
	trusty	Does not exist
	upstream	Released (72.0)
	xenial	Released (72.0.1+build1-0ubuntu0.16.04.1)
nss Launchpad, Ubuntu, Debian	bionic	Released (2:3.35-2ubuntu2.8)
	disco	Ignored (end of life)
	eoan	Released (2:3.45-1ubuntu2.3)
	focal	Not vulnerable (2:3.49.1-1ubuntu1)
	trusty	Not vulnerable
	upstream	Released (2:3.49-1)
	xenial	Not vulnerable (code not compiled)
	Patches: upstream: https://hg.mozilla.org/projects/nss/rev/d64102b76a437f24d98a20480dcc9f1655143e7c upstream: https://hg.mozilla.org/projects/nss/rev/8a2bd40e7f89a796cf24a0ff7cfb67c6e69c5c78

Severity score breakdown

Parameter	Value
Base score	6.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References

Bugs

https://bugzilla.mozilla.org/show_bug.cgi?id=1590001

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