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CVE-2021-41072

Publication date 14 September 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.1 · High

Score breakdown

squashfs_opendir in unsquash-2.c in Squashfs-Tools 4.5 allows Directory Traversal, a different vulnerability than CVE-2021-40153. A squashfs filesystem that has been crafted to include a symbolic link and then contents under the same filename in a filesystem can cause unsquashfs to first create the symbolic link pointing outside the expected directory, and then the subsequent write operation will cause the unsquashfs process to write through the symbolic link elsewhere in the filesystem.

From the Ubuntu Security Team

Richard Weinberger discovered that Squashfs-Tools mishandled certain malformed SQUASHFS files. An attacker could use this vulnerability to write arbitrary files to the filesystem.

Status

Package Ubuntu Release Status
squashfs-tools 22.04 LTS jammy
Fixed 1:4.4-2ubuntu2
21.10 impish
Fixed 1:4.4-2ubuntu2
21.04 hirsute
Fixed 1:4.4-2ubuntu0.2
20.04 LTS focal
Fixed 1:4.4-1ubuntu0.2
18.04 LTS bionic
Fixed 1:4.3-6ubuntu0.18.04.4
16.04 LTS xenial
14.04 LTS trusty Not in release

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
squashfs-tools

Severity score breakdown

Parameter Value
Base score 8.1 · High
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

Related Ubuntu Security Notices (USN)

    • USN-5078-1
    • Squashfs-Tools vulnerability
    • 15 September 2021
    • USN-5078-2
    • Squashfs-Tools vulnerabilities
    • 15 September 2021
    • USN-5078-3
    • Squashfs-Tools vulnerability
    • 13 October 2021

Other references