Bug 877391 (CVE-2012-5513) - CVE-2012-5513 kernel: xen: XENMEM_exchange may overwrite hypervisor memory
Summary: CVE-2012-5513 kernel: xen: XENMEM_exchange may overwrite hypervisor memory
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2012-5513
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: 878033 878034 883088
Blocks: 877406
TreeView+ depends on / blocked
 
Reported: 2012-11-16 12:05 UTC by Petr Matousek
Modified: 2021-02-17 08:23 UTC (History)
20 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-08-24 14:03:22 UTC

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2012:1540 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2012-12-05 01:51:24 UTC

Description Petr Matousek 2012-11-16 12:05:35 UTC 
The handler for XENMEM_exchange accesses guest memory without range checking
the guest provided addresses, thus allowing these accesses to include the
hypervisor reserved range.
                                                                                                                                                             
A malicious PV guest administrator can cause Xen to crash.  If the out of address
space bounds access does not lead to a crash, a carefully crafted privilege
escalation cannot be excluded, even though the guest doesn't itself control
the values written.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 2 Petr Matousek 2012-11-16 12:08:35 UTC 
Statement:

This issue did affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 8 Petr Matousek 2012-12-03 18:16:13 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 883088]
Comment 9 errata-xmlrpc 2012-12-04 20:56:07 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:1540 https://rhn.redhat.com/errata/RHSA-2012-1540.html
Comment 10 Fedora Update System 2012-12-12 00:16:24 UTC 
xen-4.2.0-6.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 Fedora Update System 2012-12-13 06:00:38 UTC 
xen-4.1.3-7.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Fedora Update System 2012-12-15 17:56:04 UTC 
xen-4.1.3-6.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.
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