Bug 1873084 (CVE-2020-24342)

Summary:	CVE-2020-24342 lua: buffer overflow in luaO_pushvfstring
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjohnson1, fedora, hdegoede, michel, moceap, packaging-team-maint, rob.myers, scorneli, 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:	2020-09-15 19:17:46 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:	1873085
Bug Blocks:	1873086

Description Dhananjay Arunesh 2020-08-27 10:34:52 UTC

Lua through 5.4.0 allows a stack redzone cross in luaO_pushvfstring because a protection mechanism wrongly calls luaD_callnoyield twice in a row.

References:
http://lua-users.org/lists/lua-l/2020-07/msg00052.html
https://github.com/lua/lua/commit/34affe7a63fc5d842580a9f23616d057e17dfe27

Comment 1 Dhananjay Arunesh 2020-08-27 10:35:37 UTC

Created lua tracking bugs for this issue:

Affects: fedora-all [bug 1873085]

Comment 2 Cedric Buissart 2020-09-08 13:42:17 UTC

Statement:

The versions of lua shipped in Red Hat Enterprise Linux 6, 7 and 8 are not affected by this issue : versions of lua prior to 5.4.0 had a different C-stack overflow control, which did not trigger this flaw.

Comment 4 Product Security DevOps Team 2020-09-15 19:17:46 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-2020-24342