CVE-2019-9793

Published: 20 March 2019

A mechanism was discovered that removes some bounds checking for string, array, or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript, for which the range analysis will infer a fully controlled, incorrect range in circumstances where users have explicitly disabled Spectre mitigations. *Note: Spectre mitigations are currently enabled for all users by default settings.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Notes

Author	Note
tyhicks	mozjs contains a copy of the SpiderMonkey JavaScript engine

Priority

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package	Release	Status
mozjs52 Launchpad, Ubuntu, Debian	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	focal	Needs triage
	groovy	Ignored (end of life)
	hirsute	Does not exist
	jammy	Does not exist
	bionic	Needs triage
	cosmic	Ignored (end of life)
	impish	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs60 Launchpad, Ubuntu, Debian	upstream	Needs triage
	trusty	Does not exist
	xenial	Does not exist
	bionic	Does not exist
	cosmic	Ignored (end of life)
	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	focal	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	groovy	Does not exist
	impish	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
firefox Launchpad, Ubuntu, Debian	groovy	Released (66.0+build3-0ubuntu1)
	hirsute	Released (66.0+build3-0ubuntu1)
	jammy	Released (66.0+build3-0ubuntu1)
	bionic	Released (66.0+build3-0ubuntu0.18.04.1)
	cosmic	Released (66.0+build3-0ubuntu0.18.10.1)
	disco	Released (66.0+build3-0ubuntu1)
	eoan	Released (66.0+build3-0ubuntu1)
	focal	Released (66.0+build3-0ubuntu1)
	impish	Released (66.0+build3-0ubuntu1)
	kinetic	Released (66.0+build3-0ubuntu1)
	lunar	Released (66.0+build3-0ubuntu1)
	trusty	Released (66.0.1+build1-0ubuntu0.14.04.1)
	upstream	Released (66.0)
	xenial	Released (66.0+build3-0ubuntu0.16.04.2)
mozjs38 Launchpad, Ubuntu, Debian	groovy	Does not exist
	hirsute	Does not exist
	jammy	Does not exist
	bionic	Needs triage
	cosmic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	impish	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
thunderbird Launchpad, Ubuntu, Debian	hirsute	Released (60.6.1+build2-0ubuntu1)
	jammy	Released (60.6.1+build2-0ubuntu1)
	bionic	Released (1:60.6.1+build2-0ubuntu0.18.04.1)
	cosmic	Released (1:60.6.1+build2-0ubuntu0.18.10.1)
	disco	Released (60.6.1+build2-0ubuntu1)
	eoan	Released (60.6.1+build2-0ubuntu1)
	focal	Released (60.6.1+build2-0ubuntu1)
	groovy	Released (60.6.1+build2-0ubuntu1)
	impish	Released (60.6.1+build2-0ubuntu1)
	kinetic	Released (60.6.1+build2-0ubuntu1)
	lunar	Released (60.6.1+build2-0ubuntu1)
	trusty	Released (1:60.6.1+build2-0ubuntu0.14.04.1)
	upstream	Released (60.6)
	xenial	Released (1:60.6.1+build2-0ubuntu0.16.04.1)

Severity score breakdown

Parameter	Value
Base score	5.9
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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