Bug 1808510 (CVE-2020-12829)

Summary:	CVE-2020-12829 qemu: OOB read and write due to integer overflow in sm501_2d_operation() in hw/display/sm501.c
Product:	[Other] Security Response	Reporter:	Mauro Matteo Cascella <mcascell>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	1015138407, ailan, amit, areis, berrange, cfergeau, dbecker, drjones, dwmw2, imammedo, itamar, jen, jferlan, jforbes, jjoyce, jmaloy, jpadman, jschluet, kbasil, knoel, lhh, lkundrak, lpeer, m.a.young, mburns, mkenneth, mrezanin, mst, pbonzini, ribarry, rjones, robinlee.sysu, sclewis, slinaber, virt-maint, virt-maint, vkuznets, 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:	An integer overflow flaw was found in the SM501 display driver implementation of the QEMU emulator. This flaw occurs in the COPY_AREA macro while handling MMIO write operations through the sm501_2d_engine_write() callback. A local attacker could abuse this flaw to crash the QEMU process on the host, resulting in a denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-04-15 10:31:49 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:	1819670, 1819639, 1819640, 1819641, 1819643, 1819645, 1819669, 1819671, 1819694, 1819695, 1819701
Bug Blocks:	1786593

Description Mauro Matteo Cascella 2020-02-28 17:11:41 UTC

An out-of-bounds read/write vulnerability was found in function Sm501_2d_operation() in hw/display/sm501.c. The OOB flaw is caused by an integer overflow in COPY_AREA when the `rtl` parameter is set to 1, and either `src_y` or `src_x` is less than `operation_height`. Please refer to the following duplicate bug for further details: https://bugzilla.redhat.com/show_bug.cgi?id=1786026.

Upstream fix:
https://git.qemu.org/?p=qemu.git;a=commit;h=b15a22bbcbe6a78dc3d88fe3134985e4cdd87de4

Comment 1 Mauro Matteo Cascella 2020-03-03 17:18:03 UTC

*** Bug 1786026 has been marked as a duplicate of this bug. ***

Comment 4 Mauro Matteo Cascella 2020-04-01 09:43:14 UTC

Created qemu tracking bugs for this issue:

Affects: epel-7 [bug 1819670]
Affects: fedora-all [bug 1819669]


Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1819671]

Comment 6 Mauro Matteo Cascella 2020-04-01 11:00:22 UTC

Acknowledgments:

Name: Ziming Zhang

Comment 12 Mauro Matteo Cascella 2020-04-15 08:26:04 UTC

Statement:

This flaw did not affect the versions of `qemu-kvm` as shipped with Red Hat Enterprise Linux 6, as they did not include the vulnerable code, which was introduced in a later version of the package.
Red Hat Enterprise Linux 7, 8 and RHEL Advanced Virtualization are not affected by this flaw, as the SM501 device is not built and shipped with the products listed.

Comment 15 Mauro Matteo Cascella 2020-05-14 07:51:12 UTC

CVE-2020-12829 assigned via MITRE form.