USN-5179-1: BusyBox vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

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

• 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

• 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

• 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

• CVE-2021-28831
• CVE-2021-42378
• CVE-2021-42386
• CVE-2021-42385
• CVE-2021-42382
• CVE-2021-42384
• CVE-2021-42379
• CVE-2021-42374
• CVE-2021-42380
• CVE-2021-42381

Related notices

• USN-5179-2: busybox-initramfs, busybox-static, udhcpd, busybox, busybox-syslogd, udhcpc
• USN-6335-1: busybox-initramfs, busybox-static, udhcpd, busybox, busybox-syslogd, udhcpc