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Ubuntu Security Notice USN-5057-1
August 31, 2021
squashfs-tools vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
squashfs-tools could be made to overwrite files.
Software Description:
- 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:
squashfs-tools 1:4.4-2ubuntu0.1
Ubuntu 20.04 LTS:
squashfs-tools 1:4.4-1ubuntu0.1
Ubuntu 18.04 LTS:
squashfs-tools 1:4.3-6ubuntu0.18.04.3
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5057-1
CVE-2021-40153
Package Information:
https://launchpad.net/ubuntu/+source/squashfs-tools/1:4.4-2ubuntu0.1
https://launchpad.net/ubuntu/+source/squashfs-tools/1:4.4-1ubuntu0.1
https://launchpad.net/ubuntu/+source/squashfs-tools/1:4.3-6ubuntu0.18.04.3
