Bug 1549798 (CVE-2018-7550)

Summary:	CVE-2018-7550 QEMU: i386: multiboot OOB access while loading kernel image
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	ailan, amit, apevec, areis, berrange, cfergeau, chrisw, drjones, dwmw2, imammedo, itamar, jen, jforbes, jjoyce, jschluet, kbasil, klaas, knoel, lhh, lpeer, markmc, m.a.young, mburns, mkenneth, mrezanin, mst, mvanderw, pbonzini, ppandit, rbryant, rjones, rkrcmar, robinlee.sysu, sclewis, 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:	Quick Emulator (QEMU), compiled with the PC System Emulator with multiboot feature support, is vulnerable to an OOB r/w memory access issue. The issue could occur while loading a kernel image during the guest boot, if mh_load_end_addr address is greater than the mh_bss_end_addr address. A user or process could use this flaw to potentially achieve arbitrary code execution on a host.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:41:49 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:	1549799, 1549802, 1549803, 1549820, 1549821, 1549822, 1549823, 1549824, 1549825, 1549826, 1549827, 1549828, 1549829, 1549926, 1549927
Bug Blocks:	1547556

Description Prasad Pandit 2018-02-27 20:35:19 UTC

Quick Emulator(QEMU) built with the PC System Emulator with multiboot feature
support is vulnerable to an OOB memory access issue. It could occur while
loading a kernel image during a guest boot if multiboot head addresses
mh_load_end_addr was greater than mh_bss_end_addr.

A user/process could use this flaw to potentially achieve arbitrary code
execution on a host.

Upstream patch:
---------------
  -> https://lists.nongnu.org/archive/html/qemu-devel/2018-03/msg01885.html

Reference:
----------
  -> http://www.openwall.com/lists/oss-security/2018/03/08/4

Comment 1 Prasad Pandit 2018-02-27 20:36:03 UTC

Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1549799]

Comment 5 Prasad Pandit 2018-02-27 20:51:08 UTC

Acknowledgments:

Name: Cyrille Chatras (Orange.com), CERT-CC (Orange.com)

Comment 9 errata-xmlrpc 2018-05-10 16:04:48 UTC

This issue has been addressed in the following products:

  Red Hat Virtualization 4 for RHEL-7

Via RHSA-2018:1369 https://access.redhat.com/errata/RHSA-2018:1369

Comment 10 Joshua Padman 2018-06-07 04:50:16 UTC

This issue has been addressed in the following products:

  Red Hat OpenStack Platform 8
Via RHSA-2018:1646 https://access.redhat.com/errata/RHSA-2018:1646

  Red Hat OpenStack Platform 9
Via RHSA-2018:1645 https://access.redhat.com/errata/RHSA-2018:1645

  Red Hat OpenStack Platform 10
Via RHSA-2018:1644 https://access.redhat.com/errata/RHSA-2018:1644

  Red Hat OpenStack Platform 12
Via RHSA-2018:1643 https://access.redhat.com/errata/RHSA-2018:1643

Comment 11 errata-xmlrpc 2018-08-16 14:17:17 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2462 https://access.redhat.com/errata/RHSA-2018:2462