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Ubuntu Security Notice USN-6335-1
September 04, 2023

busybox vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in BusyBox.

Software Description:
- busybox: Tiny utilities for small and embedded systems

Details:

It was discovered that BusyBox incorrectly handled certain malformed gzip
archives. If a user or automated system were tricked into processing a
specially crafted gzip archive, a remote attacker could use this issue to
cause BusyBox to crash, resulting in a denial of service, or execute
arbitrary code. This issue only affected Ubuntu 14.04 LTS.
(CVE-2021-28831)

It was discovered that BusyBox did not properly validate user input when
performing certain arithmetic operations. If a user or automated system
were tricked into processing a specially crafted file, an attacker could
possibly use this issue to cause BusyBox to crash, resulting in a denial
of service, or execute arbitrary code. (CVE-2022-48174)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
busybox 1:1.27.2-2ubuntu3.4+esm1
busybox-initramfs 1:1.27.2-2ubuntu3.4+esm1
busybox-static 1:1.27.2-2ubuntu3.4+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
busybox 1:1.22.0-15ubuntu1.4+esm2
busybox-initramfs 1:1.22.0-15ubuntu1.4+esm2
busybox-static 1:1.22.0-15ubuntu1.4+esm2

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
busybox 1:1.21.0-1ubuntu1.4+esm1
busybox-initramfs 1:1.21.0-1ubuntu1.4+esm1
busybox-static 1:1.21.0-1ubuntu1.4+esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6335-1
CVE-2021-28831, CVE-2022-48174