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AUSCERT External Security Bulletin Redistribution
ESB-2021.2932
USN-5057-1: Squashfs-Tools vulnerability
31 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Squashfs-Tools
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Overwrite Arbitrary Files -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-40153
Original Bulletin:
https://ubuntu.com/security/notices/USN-5057-1
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running Squashfs-Tools check for an updated version of the software
for their operating system.
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USN-5057-1: Squashfs-Tools vulnerability
31 August 2021
squashfs-tools could be made to overwrite files.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o squashfs-tools - Tools to create and modify squashfs filesystems
Details
Etienne Stalmans discovered that Squashfs-Tools mishandled certain malformed
SQUASHFS files. An attacker could use this vulnerability to write arbitrary
files to the filesystem.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o squashfs-tools - 1:4.4-2ubuntu0.1
Ubuntu 20.04
o squashfs-tools - 1:4.4-1ubuntu0.1
Ubuntu 18.04
o squashfs-tools - 1:4.3-6ubuntu0.18.04.3
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-40153
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