Bug 1163075 (CVE-2014-7840) - CVE-2014-7840 qemu: insufficient parameter validation during ram load
Summary: CVE-2014-7840 qemu: insufficient parameter validation during ram load
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2014-7840
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1163077 1163078 1163079 1163080
Blocks: 1162403
TreeView+ depends on / blocked
 
Reported: 2014-11-12 10:41 UTC by Petr Matousek
Modified: 2023-05-12 05:46 UTC (History)
32 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that certain values that were read when loading RAM during migration were not validated. A user able to alter the savevm data (either on the disk or over the wire during migration) could use either of these flaws to corrupt QEMU process memory on the (destination) host, which could potentially result in arbitrary code execution on the host with the privileges of the QEMU process.
Clone Of:
Environment:
Last Closed: 2019-06-08 02:36:01 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0349 0 normal SHIPPED_LIVE Important: qemu-kvm security, bug fix, and enhancement update 2015-03-05 12:27:34 UTC
Red Hat Product Errata RHSA-2015:0624 0 normal SHIPPED_LIVE Important: qemu-kvm-rhev security, bug fix, and enhancement update 2015-03-05 14:37:36 UTC

Description Petr Matousek 2014-11-12 10:41:17 UTC 
During migration, the values read from migration stream during ram 
load are not validated. Especially offset in host_from_stream_offset()
and also the length of the writes in the callers of the said function.

A user able to alter the savevm data (either on the disk or over the
wire during migration) could use either of these flaws to corrupt QEMU
process memory on the (destination) host, which could potentially
result in arbitrary code execution on the host with the privileges of
the QEMU process.

Acknowledgements:

This issue was discovered by Michael S. Tsirkin of Red Hat.
Comment 1 Petr Matousek 2014-11-12 10:43:06 UTC 
Statement:

This issue affects the qemu-kvm packages as shipped with Red Hat Enterprise 
Linux 5, 6 and 7. Future updates for the respective releases may address this 
issue.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and 
maintenance life cycle. This has been rated as having Moderate security impact 
and is not currently planned to be addressed in future updates. For additional 
information, refer to the Red Hat Enterprise Linux Life Cycle: 
https://access.redhat.com/support/policy/updates/errata/.
Comment 2 Petr Matousek 2014-11-12 10:43:50 UTC 
Upstream patch submission --

http://thread.gmane.org/gmane.comp.emulators.qemu/306117
Comment 5 Petr Matousek 2014-11-12 10:47:31 UTC 
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1163080]
Comment 6 Petr Matousek 2014-11-20 11:04:05 UTC 
Upstream commit:

http://git.qemu.org/?p=qemu.git;a=commit;h=0be839a2701369f669532ea5884c15bead1c6e08
Comment 7 Fedora Update System 2014-12-12 04:26:55 UTC 
qemu-2.1.2-7.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Fedora Update System 2014-12-23 18:30:21 UTC 
qemu-1.6.2-12.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 errata-xmlrpc 2015-03-05 08:13:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0349 https://rhn.redhat.com/errata/RHSA-2015-0349.html
Comment 10 errata-xmlrpc 2015-03-05 09:58:15 UTC 
This issue has been addressed in the following products:

  RHEV-H and Agents for RHEL-7

Via RHSA-2015:0624 https://rhn.redhat.com/errata/RHSA-2015-0624.html
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