Bug 2039843 (CVE-2022-0156)

Summary:	CVE-2022-0156 vim: use-after-free while treating allocated lines in user functions
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bdettelb, caswilli, fhrdina, fjansen, gchamoul, jburrell, jwong, karsten, kaycoth, micjohns, sthirugn, vkrizan, vkumar, vmugicag, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	vim 8.2.4040	Doc Type:	If docs needed, set a value
Doc Text:	It was found that vim was vulnerable to use-after-free flaw in the way it was treating allocated lines in user functions. A specially crafted file could crash the vim process or possibly lead to other undefined behaviors.	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:	2039845, 2040253, 2043462
Bug Blocks:	2039688

Description Marian Rehak 2022-01-12 14:29:07 UTC

A use-after-free possible.

Reference:

https://huntr.dev/bounties/47dded34-3767-4725-8c7c-9dcb68c70b36

Upstream fix :
https://github.com/vim/vim/commit/9f1a39a5d1cd7989ada2d1cb32f97d84360e050f
https://github.com/vim/vim/commit/143367256836b0f69881dc0c65ff165ae091dbc5 (additional required fix)

Comment 1 Marian Rehak 2022-01-12 14:29:36 UTC

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 2039845]

Comment 3 Cedric Buissart 2022-01-13 10:18:05 UTC

Vim versions prior to 8.2 do not seem to be vulnerable to this flaw

Comment 5 Cedric Buissart 2022-01-14 15:57:47 UTC

The flaw was introduced in v8.2.3902. Older versions are not impacted by this flaw.