Bug 1941028 (CVE-2021-28831)

Summary:	CVE-2021-28831 busybox: invalid free or segmentation fault via malformed gzip data
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, dvlasenk, spotrh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		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:	1941029
Bug Blocks:	1941030

Description Guilherme de Almeida Suckevicz 2021-03-19 18:47:16 UTC

decompress_gunzip.c in BusyBox through 1.32.1 mishandles the error bit on the huft_build result pointer, with a resultant invalid free or segmentation fault, via malformed gzip data.

Reference and upstream patch:
https://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bd

Comment 1 Guilherme de Almeida Suckevicz 2021-03-19 18:47:34 UTC

Created busybox tracking bugs for this issue:

Affects: fedora-all [bug 1941029]

Comment 2 Huzaifa S. Sidhpurwala 2021-04-12 04:11:11 UTC

Support for gunzip was introduced in busybox-1.20, therefore version of busybox shipped with Red Hat Enterprise Linux 6 is not affected by this flaw.

Comment 3 Huzaifa S. Sidhpurwala 2021-04-12 04:11:14 UTC

Statement:

Support for gunzip was introduced in busybox-1.20, therefore version of busybox shipped with Red Hat Enterprise Linux 6 is not affected by this flaw.