Bug 563463 - (CVE-2010-0419) CVE-2010-0419 kvm: emulator privilege escalation segment selector check
CVE-2010-0419 kvm: emulator privilege escalation segment selector 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=20100208,public=20100301,sou...
: Security
Depends On: 563464 563465 563466 563468
Blocks:
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Reported: 2010-02-10 05:26 EST by Petr Matousek
Modified: 2011-04-05 15:57 EDT (History)
10 users (show)

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Doc Type: Bug Fix
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Last Closed: 2011-04-05 15:57:43 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2010-02-10 05:26:47 EST
Paolo Bonzini found a bug in KVM that can be used to bypass proper permission
checking while loading segment selectors. Malicious guest userspace process
running in SMP guest can trick the emulator into loading kernel segment selector
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 kernel selector loading 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 4 errata-xmlrpc 2010-03-01 14:23:46 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2010:0126 https://rhn.redhat.com/errata/RHSA-2010-0126.html
Comment 5 errata-xmlrpc 2010-03-24 11:46:57 EDT
This issue has been addressed in following products:

  Red Hat Enterprise Virtualization for RHEL-5

Via RHSA-2010:0172 https://rhn.redhat.com/errata/RHSA-2010-0172.html

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