Bug 877365 - (CVE-2012-5511, CVE-2012-6333) CVE-2012-5511 CVE-2012-6333 kernel: xen: several HVM operations do not validate the range of their inputs
CVE-2012-5511 CVE-2012-6333 kernel: xen: several HVM operations do not valida...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20121203,repor...
: Security
: 886863 (view as bug list)
Depends On: 883084
Blocks: 877406
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Reported: 2012-11-16 06:07 EST by Petr Matousek
Modified: 2013-08-24 10:03 EDT (History)
7 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-08-24 10:03:11 EDT
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Description Petr Matousek 2012-11-16 06:07:55 EST
Several HVM control operations do not check the size of their inputs
and can tie up a physical CPU for extended periods of time.
                                                                                                                                                             
In addition dirty video RAM tracking involves clearing the bitmap
provided by the domain controlling the guest (e.g. dom0 or a
stubdom). If the size of that bitmap is overly large, an intermediate
variable on the hypervisor stack may overflow that stack.
                                                                                                                                                             
A malicious guest administrator can cause Xen to become unresponsive
or to crash leading in either case to a Denial of Service.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-11-16 06:28:09 EST
Statement:

Not vulnerable.

This issue did not 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 4 Petr Matousek 2012-12-03 13:10:11 EST
Created xen tracking bugs for this issue

Affects: fedora-all [bug 883084]
Comment 5 Fedora Update System 2012-12-11 19:16:14 EST
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 6 Fedora Update System 2012-12-13 01:00:18 EST
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 7 Petr Matousek 2012-12-13 09:17:47 EST
*** Bug 886863 has been marked as a duplicate of this bug. ***
Comment 8 Fedora Update System 2012-12-15 12:55:47 EST
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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