==========================================================================
Ubuntu Security Notice USN-5179-1
December 07, 2021

busybox vulnerabilities
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

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

It was discovered that BusyBox incorrectly handled certain malformed LZMA
archives. If a user or automated system were tricked into processing a
specially crafted LZMA archive, a remote attacker could use this issue to
cause BusyBox to crash, resulting in a denial of service, or possibly
leak sensitive information. (CVE-2021-42374)

Vera Mens, Uri Katz, Tal Keren, Sharon Brizinov, and Shachar Menashe
discovered that BusyBox incorrectly handled certain awk patterns. If a user
or automated system were tricked into processing a specially crafted awk
pattern, a remote attacker could use this issue to cause BusyBox to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2021-42378, CVE-2021-42379, CVE-2021-42380, CVE-2021-42381,
CVE-2021-42382, CVE-2021-42384, CVE-2021-42385, CVE-2021-42386)

Update instructions:

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

Ubuntu 21.10:
  busybox                         1:1.30.1-6ubuntu3.1
  busybox-initramfs               1:1.30.1-6ubuntu3.1
  busybox-static                  1:1.30.1-6ubuntu3.1

Ubuntu 21.04:
  busybox                         1:1.30.1-6ubuntu2.1
  busybox-initramfs               1:1.30.1-6ubuntu2.1
  busybox-static                  1:1.30.1-6ubuntu2.1

Ubuntu 20.04 LTS:
  busybox                         1:1.30.1-4ubuntu6.4
  busybox-initramfs               1:1.30.1-4ubuntu6.4
  busybox-static                  1:1.30.1-4ubuntu6.4

Ubuntu 18.04 LTS:
  busybox                         1:1.27.2-2ubuntu3.4
  busybox-initramfs               1:1.27.2-2ubuntu3.4
  busybox-static                  1:1.27.2-2ubuntu3.4

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

References:
  https://ubuntu.com/security/notices/USN-5179-1
  CVE-2021-28831, CVE-2021-42374, CVE-2021-42378, CVE-2021-42379,
  CVE-2021-42380, CVE-2021-42381, CVE-2021-42382, CVE-2021-42384,
  CVE-2021-42385, CVE-2021-42386

Package Information:
  https://launchpad.net/ubuntu/+source/busybox/1:1.30.1-6ubuntu3.1
  https://launchpad.net/ubuntu/+source/busybox/1:1.30.1-6ubuntu2.1
  https://launchpad.net/ubuntu/+source/busybox/1:1.30.1-4ubuntu6.4
  https://launchpad.net/ubuntu/+source/busybox/1:1.27.2-2ubuntu3.4