Bug 917012 (CVE-2013-1796) - CVE-2013-1796 kernel: kvm: buffer overflow in handling of MSR_KVM_SYSTEM_TIME
Summary: CVE-2013-1796 kernel: kvm: buffer overflow in handling of MSR_KVM_SYSTEM_TIME
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2013-1796
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 917018 917019 917020 917021 923966 964429 964430
Blocks: 917037
TreeView+ depends on / blocked
 
Reported: 2013-03-01 13:18 UTC by Petr Matousek
Modified: 2023-05-11 22:10 UTC (History)
20 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-04-23 20:58:08 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0727 0 normal SHIPPED_LIVE Important: kvm security update 2013-04-09 22:11:53 UTC
Red Hat Product Errata RHSA-2013:0744 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2013-04-23 22:25:40 UTC
Red Hat Product Errata RHSA-2013:0746 0 normal SHIPPED_LIVE Important: rhev-hypervisor6 security and bug fix update 2013-04-23 22:55:51 UTC
Red Hat Product Errata RHSA-2013:0928 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2013-06-11 21:37:17 UTC
Red Hat Product Errata RHSA-2013:1026 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2013-07-09 19:04:31 UTC

Description Petr Matousek 2013-03-01 13:18:07 UTC 
Description of the problem:
If the guest sets the GPA of the time_page so that the request to update the 
time straddles a page then KVM will write onto an incorrect page.  The
write is done byusing kmap atomic to get a pointer to the page for the time
structure and then performing a memcpy to that page starting at an offset
that the guest controls.  Well behaved guests always provide a 32-byte aligned
address, however a malicious guest could use this to corrupt host kernel
memory.

Acknowledgements:

Red Hat would like to thank Andrew Honig of Google for reporting this issue.
Comment 1 Petr Matousek 2013-03-01 13:19:06 UTC 
Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat
Enterprise Linux 5 and Red Hat Enterprise MRG as they did not provide support
for the KVM subsystem.
Comment 5 Petr Matousek 2013-03-20 10:01:01 UTC 
Upstream fix:

https://git.kernel.org/cgit/virt/kvm/kvm.git/commit/?id=c300aa64ddf57d9c5d9c898a64b36877345dd4a9
Comment 6 Petr Matousek 2013-03-20 19:46:25 UTC 
Created kernel tracking bugs for this issue

Affects: fedora-all [bug 923966]
Comment 11 Fedora Update System 2013-03-23 23:58:15 UTC 
kernel-3.8.4-202.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 16 errata-xmlrpc 2013-04-09 18:14:50 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0727 https://rhn.redhat.com/errata/RHSA-2013-0727.html
Comment 17 errata-xmlrpc 2013-04-23 18:28:07 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0744 https://rhn.redhat.com/errata/RHSA-2013-0744.html
Comment 18 errata-xmlrpc 2013-04-23 18:56:34 UTC 
This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0746 https://rhn.redhat.com/errata/RHSA-2013-0746.html
Comment 20 errata-xmlrpc 2013-06-11 17:40:21 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.3 EUS - Server Only

Via RHSA-2013:0928 https://rhn.redhat.com/errata/RHSA-2013-0928.html
Comment 21 errata-xmlrpc 2013-07-09 15:05:58 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.2 EUS - Server Only

Via RHSA-2013:1026 https://rhn.redhat.com/errata/RHSA-2013-1026.html
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