CVE-2021-40153

2021-08-2700:00:00

ubuntu.com

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:M/Au:N/C:N/I:P/A:P

0.007 Low

EPSS

Percentile

80.7%

JSON

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.

OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchsquashfs-tools< 1:4.3-6ubuntu0.18.04.3UNKNOWN
ubuntu20.04noarchsquashfs-tools< 1:4.4-1ubuntu0.1UNKNOWN
ubuntu21.04noarchsquashfs-tools< 1:4.4-2ubuntu0.1UNKNOWN
ubuntu21.10noarchsquashfs-tools< 1:4.4-2ubuntu1UNKNOWN
ubuntu22.04noarchsquashfs-tools< 1:4.4-2ubuntu1UNKNOWN
ubuntu16.04noarchsquashfs-tools< 1:4.3-3ubuntu2.16.04.3+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	18.04	noarch	squashfs-tools	< 1:4.3-6ubuntu0.18.04.3	UNKNOWN
ubuntu	20.04	noarch	squashfs-tools	< 1:4.4-1ubuntu0.1	UNKNOWN
ubuntu	21.04	noarch	squashfs-tools	< 1:4.4-2ubuntu0.1	UNKNOWN
ubuntu	21.10	noarch	squashfs-tools	< 1:4.4-2ubuntu1	UNKNOWN
ubuntu	22.04	noarch	squashfs-tools	< 1:4.4-2ubuntu1	UNKNOWN
ubuntu	16.04	noarch	squashfs-tools	< 1:4.3-3ubuntu2.16.04.3+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only	UNKNOWN