Bug 1789499 (CVE-2019-20079)

Summary:	CVE-2019-20079 vim: Use after free in window.c
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gchamoul, karsten, zdohnal
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	vim 8.1.2136	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-01-13 20:09:42 UTC	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:	1789500
Bug Blocks:	1789501

Description Pedro Sampaio 2020-01-09 17:52:40 UTC

The autocmd feature in window.c in Vim before 8.1.2136 accesses freed memory.

Upstream patch:

https://github.com/vim/vim/commit/ec66c41d84e574baf8009dbc0bd088d2bc5b2421
https://github.com/vim/vim/compare/v8.1.2135...v8.1.2136

Comment 1 Pedro Sampaio 2020-01-09 17:53:02 UTC

Created vim tracking bugs for this issue:

Affects: fedora-all [bug 1789500]

Comment 2 Riccardo Schirone 2020-01-13 16:49:48 UTC

Upstream issue:

https://github.com/vim/vim/issues/5041

Comment 3 Riccardo Schirone 2020-01-13 17:15:09 UTC

The following commit introduces the vulnerability:
https://github.com/vim/vim/commit/a27e1dcddc9e3914ab34b164f71c51b72903b00b

This commit was first introduced in upstream version v8.1.2121.

Comment 4 Riccardo Schirone 2020-01-13 17:19:13 UTC

Statement:

The versions of vim as shipped in Red Hat Enterprise Linux 5, 6, 7, and 8 are not affected by this flaw because the vulnerability was introduced in a newer version of the component.

Comment 5 Product Security DevOps Team 2020-01-13 20:09:42 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-20079