CVE-2021-40153

Published: 27 August 2021

squashfs_opendir in unsquash-1.c in Squashfs-Tools 4.5 stores the filename in the directory entry; this is then used by unsquashfs to create the new file during the unsquash. The filename is not validated for traversal outside of the destination directory, and thus allows writing to locations outside of the destination.

Priority

Cvss 3 Severity Score

8.1

Score breakdown

Status

Package	Release	Status
squashfs-tools Launchpad, Ubuntu, Debian	bionic	Released (1:4.3-6ubuntu0.18.04.3)
	focal	Released (1:4.4-1ubuntu0.1)
	hirsute	Released (1:4.4-2ubuntu0.1)
	impish	Released (1:4.4-2ubuntu1)
	jammy	Released (1:4.4-2ubuntu1)
	trusty	Does not exist
	upstream	Needs triage
	xenial	Released (1:4.3-3ubuntu2.16.04.3+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)

Severity score breakdown

Parameter	Value
Base score	8.1
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References

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