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CVE-2021-42380

Publication date 15 November 2021

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

7.2 · High

Score breakdown

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the clrvar function

Read the notes from the security team

Status

Package Ubuntu Release Status
busybox 22.04 LTS jammy
Fixed 1:1.30.1-7ubuntu2
21.10 impish
Fixed 1:1.30.1-6ubuntu3.1
21.04 hirsute
Fixed 1:1.30.1-6ubuntu2.1
20.04 LTS focal
Fixed 1:1.30.1-4ubuntu6.4
18.04 LTS bionic
Fixed 1:1.27.2-2ubuntu3.4
16.04 LTS xenial Ignored see notes
14.04 LTS trusty Ignored see notes

Notes

ccdm94

fix (importing awk.c from busybox version >= 1.34.0 due to large amount of changes made to the awk.c code) introduces a regression to busybox awk in xenial and earlier. Applying changes from the commit which prevents this regression from happening (237bedd499c) could result in further regressions being introduced to other applets in busybox. This happens because interfaces for applets are altered in this commit, and the calls to get them executed through busybox are modified. External applications which use busybox could end up with regressions as well because of this.

Severity score breakdown

Parameter Value
Base score 7.2 · High
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H