Bug 1960321 (CVE-2021-38578)

Summary:	CVE-2021-38578 edk2: integer underflow in SmmEntryPoint function leads to potential SMM privilege escalation
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	berrange, crobinso, ddepaula, jferlan, jmaloy, kraxel, lersek, pbonzini, philmd, security-response-team, virt-maint, virt-maint, xuwei
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in edk2. A integer underflow in the SmmEntryPoint function leads to a write into the SMM region allowing a local attacker with administration privileges on the system to execute code within the SMM privileged context. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-09 14:45:53 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:	1989856, 1989857, 2096378, 2096379
Bug Blocks:	1959708

Description Guilherme de Almeida Suckevicz 2021-05-13 16:32:19 UTC

Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

Reference:
https://bugzilla.tianocore.org/show_bug.cgi?id=3387

Comment 5 Mauro Matteo Cascella 2022-06-13 16:39:29 UTC

Created edk2 tracking bugs for this issue:

Affects: epel-7 [bug 2096378]
Affects: fedora-all [bug 2096379]

Comment 6 Gerd Hoffmann 2022-06-14 11:59:28 UTC

https://edk2.groups.io/g/devel/message/90516

Comment 8 errata-xmlrpc 2023-05-09 07:13:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2023:2165 https://access.redhat.com/errata/RHSA-2023:2165

Comment 9 Product Security DevOps Team 2023-05-09 14:45:50 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-2021-38578