Bug 559091 - (CVE-2010-0298) CVE-2010-0298 kvm: emulator privilege escalation
CVE-2010-0298 kvm: emulator privilege escalation
Status: CLOSED NOTABUG
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=20100127,public=20100209,sou...
: Security
Depends On: 559093 559095 559096 560903
Blocks:
  Show dependency treegraph
 
Reported: 2010-01-27 01:10 EST by Eugene Teo (Security Response)
Modified: 2016-04-26 19:35 EDT (History)
19 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2011-04-06 04:06:40 EDT
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Proposed patch (13.34 KB, patch)
2010-01-27 01:15 EST, Eugene Teo (Security Response)
no flags Details | Diff

  None (edit)
Description Eugene Teo (Security Response) 2010-01-27 01:10:02 EST
Gleb Natapov found a bug in KVM that allows code that runs in CPL3 (inside a 
guest) to modify memory in CPL0 (inside a guest). The bug is in x86 emulator 
code. When emulator accesses guest's memory on behalf of the gust's code it does this with the CPL0 privilege, so if emulated instruction is executed by 
unprivileged code it can still modify memory that otherwise is not accessible to it. To tak advantage of this vulnerability malicious code should trick KVM to emulate malicious instruction.  KVM emulates IO and MMIO instructions, so if unprivileged process has access to some IO port or MMIO region (framebuffer for instance) the bug is very easy to use to modify arbitrary location in kernel memory.
Comment 2 Eugene Teo (Security Response) 2010-01-27 01:15:12 EST
Created attachment 386981 [details]
Proposed patch
Comment 9 errata-xmlrpc 2010-02-09 05:01:54 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 10 errata-xmlrpc 2010-02-09 10:24:06 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
Comment 12 Eugene Teo (Security Response) 2010-11-22 04:11:42 EST
Upstream commit:
http://git.kernel.org/linus/1871c6020d7308afb99127bba51f04548e7ca84e

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