A BusyBox security update has been released for Ubuntu Linux 16.04 ESM.

USN-5179-2: BusyBox vulnerability

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Ubuntu Security Notice USN-5179-2
May 10, 2022

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

- Ubuntu 16.04 ESM

Summary:

BusyBox could be made to crash or run programs if it received specially
crafted input.

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

Details:

USN-5179-1 fixed vulnerabilities in BusyBox. This update provides the
corresponding updates for Ubuntu 16.04 ESM.

Original advisory 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 possibly
execute arbitrary code. (CVE-2021-28831)

Update instructions:

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

Ubuntu 16.04 ESM:
busybox 1:1.22.0-15ubuntu1.4+esm1
busybox-initramfs 1:1.22.0-15ubuntu1.4+esm1
busybox-static 1:1.22.0-15ubuntu1.4+esm1

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

References:
https://ubuntu.com/security/notices/USN-5179-2
https://ubuntu.com/security/notices/USN-5179-1
CVE-2021-28831