Bug 1660372 (CVE-2018-20124)

Summary:	CVE-2018-20124 QEMU: rdma: OOB access when building scatter-gather array
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
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:	2018-12-20 05:18:18 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:	1660373
Bug Blocks:	1649132

Description Prasad Pandit 2018-12-18 08:46:08 UTC

An out-of-bound stack buffer r/w access issue was found in QEMU's generic
RDMA back-end implementation. It could occur when a driver tries to build
scatter/gather element's array in build_host_sge_array() routine.

A guest user/process could use this flaw to crash the QEMU process
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02822.html

Reference:
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  -> https://www.openwall.com/lists/oss-security/2018/12/18/2

Comment 1 Prasad Pandit 2018-12-18 08:46:12 UTC

Acknowledgments:

Name: Saar Amar

Comment 2 Prasad Pandit 2018-12-18 08:46:24 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1660373]