Bug 560654 – CVE-2010-0306 kvm: emulator privilege escalation IOPL/CPL level check

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Bug 560654 - (CVE-2010-0306) CVE-2010-0306 kvm: emulator privilege escalation IOPL/CPL level check

Summary:	CVE-2010-0306 kvm: emulator privilege escalation IOPL/CPL level check

Status:	CLOSED ERRATA

Aliases:	CVE-2010-0306

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	reported=20100201,public=20100209,sou...
Keywords:	Security

Depends On:	560697 560698 560699 560904
Blocks:
	Show dependency tree / graph

Reported:	2010-02-01 09:30 EST by Petr Matousek
Modified:	2011-04-05 15:56 EDT (History)
CC List:	9 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-04-05 15:56:43 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2010:0088	normal	SHIPPED_LIVE	Important: kvm security and bug fix update	2010-02-09 05:01:51 EST
Red Hat Product Errata	RHSA-2010:0095	normal	SHIPPED_LIVE	Important: rhev-hypervisor security and bug fix update	2010-02-09 10:23:40 EST

Groups: None (edit)

Description Petr Matousek 2010-02-01 09:30:38 EST

Gleb Napatov found a bug in KVM that can be used to bypass proper IOPL/CPL
checking. KVM relies on CPU to check IOPL/CPL before instruction execution, so
emulator doesn't do IOPL/CPL checking. Malicious guest process running in SMP
guest can bypass CPU IOPL/CPL checking if it has access to IO port or MMIO
region. To do so it should run legitimate instruction that does IO and will
cause vcpu to enter emulator in one thread and replace this instruction to
malicious one from another thread. If instruction is replaced after KVM
entered emulator, but before instruction is fetched emulator will be
tricked to execute privileged instruction without permission checking.

Comment 12 errata-xmlrpc 2010-02-09 05:01:56 EST

This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0088 https://rhn.redhat.com/errata/RHSA-2010-0088.html

Comment 14 errata-xmlrpc 2010-02-09 10:24:09 EST

This issue has been addressed in following products:

  Red Hat Enterprise Virtualization for RHEL-5

Via RHSA-2010:0095 https://rhn.redhat.com/errata/RHSA-2010-0095.html

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