CVE-2023-6857

Published: 20 December 2023

When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

Notes

Author	Note
tyhicks	mozjs contains a copy of the SpiderMonkey JavaScript engine
mdeslaur	starting with Ubuntu 22.04, the firefox package is just a script that installs the Firefox snap

Priority

Cvss 3 Severity Score

5.3

Score breakdown

Status

Package	Release	Status
firefox Launchpad, Ubuntu, Debian	bionic	Ignored (end of standard support)
	focal	Released (121.0+build1-0ubuntu0.20.04.1)
	jammy	Not vulnerable (code not present)
	lunar	Ignored (end of life, was needs-triage)
	mantic	Not vulnerable (code not present)
	trusty	Ignored (end of standard support)
	upstream	Needs triage
	xenial	Ignored (end of standard support)
mozjs102 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	jammy	Needs triage
	lunar	Ignored (end of life, was needs-triage)
	mantic	Needs triage
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs38 Launchpad, Ubuntu, Debian	bionic	Needs triage
	focal	Does not exist
	jammy	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs52 Launchpad, Ubuntu, Debian	bionic	Needs triage
	focal	Needs triage
	jammy	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs68 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Needs triage
	jammy	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs78 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	jammy	Needs triage
	lunar	Ignored (end of life, was needs-triage)
	mantic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
mozjs91 Launchpad, Ubuntu, Debian	bionic	Does not exist
	focal	Does not exist
	jammy	Needs triage
	lunar	Does not exist
	mantic	Does not exist
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
thunderbird Launchpad, Ubuntu, Debian	bionic	Ignored (end of standard support)
	focal	Released (1:115.6.0+build2-0ubuntu0.20.04.1)
	jammy	Released (1:115.6.0+build2-0ubuntu0.22.04.1)
	lunar	Released (1:115.6.0+build2-0ubuntu0.23.04.1)
	mantic	Released (1:115.6.0+build2-0ubuntu0.23.10.1)
	trusty	Ignored (end of standard support)
	upstream	Needs triage
	xenial	Ignored (end of standard support)

Severity score breakdown

Parameter	Value
Base score	5.3
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N

References

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