Bug 2023927 (CVE-2021-42381)

Summary:	CVE-2021-42381 busybox: use-after-free in awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the hash_init()
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	admiller, caswilli, dvlasenk, kaycoth, spotrh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	BusyBox 1.34.0	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in BusyBox, where it did not properly sanitize while processing a crafted awk pattern in the clrvar function, leading to possible code execution. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2023928
Bug Blocks:	2023944

Description Guilherme de Almeida Suckevicz 2021-11-16 19:17:49 UTC

A use-after-free in awk leads to denial of service and possibly code execution when processing a crafted awk pattern in the hash_init function.

Reference:
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/

Comment 1 Guilherme de Almeida Suckevicz 2021-11-16 19:18:03 UTC

Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 2023928]