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USN-5179-1: BusyBox vulnerabilities

07 December 2021

Several security issues were fixed in BusyBox.

Releases

Packages

  • 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
Ubuntu 21.04
Ubuntu 20.04
Ubuntu 18.04

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