Bug 1530356 (CVE-2018-5683)

Summary:	CVE-2018-5683 Qemu: Out-of-bounds read in vga_draw_text routine
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ailan, amit, apevec, areis, berrange, cfergeau, chrisw, drjones, dwmw2, imammedo, itamar, jen, jforbes, jjoyce, jpadman, jschluet, kbasil, knoel, kraxel, lhh, lpeer, markmc, m.a.young, mburns, mkenneth, mrezanin, mst, pbonzini, ppandit, rbryant, rjones, rkrcmar, robinlee.sysu, sclewis, security-response-team, slinaber, srevivo, tdecacqu, virt-maint, virt-maint, vkuznets, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	An out-of-bounds read access issue was found in the VGA emulator of QEMU. It could occur in vga_draw_text routine, while updating display area for a vnc client. A privileged user inside a guest could use this flaw to crash the QEMU process resulting in DoS.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:36:01 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:	1534671, 1534672, 1534680, 1534681, 1534682, 1534683, 1534684, 1534685, 1534686, 1534687, 1534688, 1534689, 1534690, 1534691, 1534692, 1534693
Bug Blocks:	1530362, 1534927

Description Pedro Sampaio 2018-01-02 18:06:43 UTC

Quick Emulator(QEMU) built with the VGA emulator support is vulnerable to an out-of-bounds access issue in vga_draw_text. It could occur while updating vga display area.

A privileged user inside guest could use this flaw to crash the Qemu process
resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-01/msg02131.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2018/01/15/2

Comment 1 Pedro Sampaio 2018-01-02 18:06:57 UTC

Acknowledgments:

Name: Jiang Xin, Lin ZheCheng

Comment 3 Prasad Pandit 2018-01-15 17:33:56 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1534672]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1534671]

Comment 8 Gerd Hoffmann 2018-01-26 06:47:56 UTC

upstream commit 191f59dc17396bb5a8da50f8c59b6e0a430711a4

Comment 9 Joshua Padman 2018-02-06 21:00:58 UTC

Red Hat OpenStack 6 will be End of Life on the 17th of February. Marking flaws as wontfix.

Comment 10 Joshua Padman 2018-04-03 23:00:26 UTC

Red Hat OpenStack 7 will not be supported on RHEL 7.5, where the fix is being release. Marking OpenStack 7 as wontfix.

Comment 11 errata-xmlrpc 2018-04-10 08:25:05 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0816 https://access.redhat.com/errata/RHSA-2018:0816

Comment 12 errata-xmlrpc 2018-04-10 19:00:15 UTC

This issue has been addressed in the following products:

  Red Hat Virtualization 4 for RHEL-7

Via RHSA-2018:1104 https://access.redhat.com/errata/RHSA-2018:1104

Comment 13 Joshua Padman 2018-04-25 23:07:28 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 8
  Red Hat OpenStack Platform 9
  Red Hat OpenStack Platform 10
  Red Hat OpenStack Platform 11
  Red Hat OpenStack Platform 12

https://access.redhat.com/errata/RHSA-2018:1113

Comment 14 errata-xmlrpc 2018-07-10 17:52:18 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:2162 https://access.redhat.com/errata/RHSA-2018:2162