Bug 560654 - (CVE-2010-0306) CVE-2010-0306 kvm: emulator privilege escalation IOPL/CPL level check
CVE-2010-0306 kvm: emulator privilege escalation IOPL/CPL level check
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
reported=20100201,public=20100209,sou...
: Security
Depends On: 560697 560698 560699 560904
Blocks:
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Reported: 2010-02-01 09:30 EST by Petr Matousek
Modified: 2011-04-05 15:56 EDT (History)
9 users (show)

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Doc Type: Bug Fix
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Last Closed: 2011-04-05 15:56:43 EDT
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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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