Bug 1164255 (CVE-2014-8867, xsa112) - CVE-2014-8867 xen: Insufficient bounding of "REP MOVS" to MMIO emulated inside the hypervisor (xsa112)
Summary: CVE-2014-8867 xen: Insufficient bounding of "REP MOVS" to MMIO emulated insid...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2014-8867, xsa112
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: 1164256
Blocks: 1164260
TreeView+ depends on / blocked
 
Reported: 2014-11-14 13:27 UTC by Petr Matousek
Modified: 2023-05-12 06:14 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
An insufficient bound checking flaw was found in the Xen hypervisor's implementation of acceleration support for the "REP MOVS" instructions. A privileged HVM guest user could potentially use this flaw to crash the host.
Clone Of:
Environment:
Last Closed: 2021-10-20 10:48:06 UTC
Embargoed:

Attachments (Terms of Use)
upstream patch (3.24 KB, patch)
2014-11-20 23:44 UTC, Vincent Danen 		no flags Details | Diff
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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0783 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2015-04-07 19:08:19 UTC

Description Petr Matousek 2014-11-14 13:27:25 UTC 
Acceleration support for the "REP MOVS" instruction, when the first
iteration accesses memory mapped I/O emulated internally in the
hypervisor, incorrectly assumes that the whole range accessed is
handled by the same hypervisor sub-component.

A buggy or malicious HVM guest can crash the host.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 2 Petr Matousek 2014-11-14 13:28:23 UTC 
Statement:

This issue does affect the versions of the kernel-xen package as shipped with
Red Hat Enterprise Linux 5. Future kernel-xen updates for Red Hat Enterprise
Linux 5 may address this issue.
Comment 6 Vincent Danen 2014-11-20 23:44:59 UTC 
Created attachment 959509 [details]
upstream patch
Comment 7 Martin Prpič 2015-04-07 08:55:53 UTC 
External References:

http://xenbits.xen.org/xsa/advisory-112.html
Comment 8 errata-xmlrpc 2015-04-07 15:12:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2015:0783 https://rhn.redhat.com/errata/RHSA-2015-0783.html
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