Bug 1860316 (CVE-2020-15889)

Summary:	CVE-2020-15889 lua: heap-based buffer over-read in lgc.c
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	drjohnson1, michel, packaging-team-maint, rob.myers, 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:	2020-07-28 04:18:04 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:	1860317, 1910622
Bug Blocks:	1860319

Description Dhananjay Arunesh 2020-07-24 10:02:23 UTC

Lua through 5.4.0 has a getobjname heap-based buffer over-read because youngcollection in lgc.c uses markold for an insufficient number of list members.

References:
http://lua-users.org/lists/lua-l/2020-07/msg00078.html
https://github.com/lua/lua/commit/127e7a6c8942b362aa3c6627f44d660a4fb75312

Comment 1 Dhananjay Arunesh 2020-07-24 10:03:03 UTC

Created lua tracking bugs for this issue:

Affects: fedora-all [bug 1860317]

Comment 2 Huzaifa S. Sidhpurwala 2020-07-28 04:16:59 UTC

Statement:

The affected code was introduced via https://github.com/lua/lua/commit/f5f3df3bd17fb3489bbd26ab39fe1580a8dbf9c9 which is part of lua-5.4. Therefore versions of lua package shipped with Red Hat products is not affected by this flaw.