Bug 1665792 (CVE-2019-3812)

Summary:	CVE-2019-3812 qemu: Out-of-bounds read in hw/i2c/i2c-ddc.c allows for memory disclosure
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, ailan, amit, areis, berrange, cfergeau, dbaker, dbecker, drjones, dwmw2, imammedo, itamar, jen, jjoyce, jokerman, jschluet, kbasil, knoel, lhh, lkundrak, lpeer, mburns, mkenneth, mrezanin, mst, pbonzini, ppandit, public, rbalakri, rjones, rkrcmar, sclewis, security-response-team, slinaber, sthangav, trankin, virt-maint, virt-maint, vkuznets, wmealing, xen-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	QEMU, through version 2.10 and through version 3.1.0, is vulnerable to an out-of-bounds read of up to 128 bytes in the i2c_ddc() function. A local attacker with permission to execute i2c commands could exploit this to read stack memory of the QEMU process on the host.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:45:16 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:	1678081, 1678082, 1679836, 1690722
Bug Blocks:	1660287

Description Sam Fowler 2019-01-14 03:38:45 UTC

QEMU through version 2.10 through to 3.1.0 is vulnerable to an out-of-bounds read
of up to 128 bytes in the hw/i2c/i2c-ddc.c:i2c_ddc() function. A local attacker
with permission to execute i2c commands could exploit this to read stack memory
of the qemu process on the host.

Systems without a monitor connected are affected, a virtual monitor is presented
to virtual guests.  Systems with no graphics cards attached to the virtual host
are not affected.

Upstream patch:
---------------
  -> https://github.com/qemu/qemu/commit/b05b267840515730dbf6753495d5b7bd8b04ad1c

Reference:
----------
  -> https://www.openwall.com/lists/oss-security/2019/02/18/1

Comment 1 Sam Fowler 2019-01-14 03:42:18 UTC

Acknowledgments:

Name: Michael Hanselmann (hansmi.ch)

Comment 7 Wade Mealing 2019-02-18 03:29:42 UTC

Created qemu tracking bugs for this issue:

Affects: epel-all [bug 1678082]
Affects: fedora-all [bug 1678081]