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Bug 1009598 - (CVE-2013-4355) CVE-2013-4355 Kernel: Xen: Xsa-63: information leak via I/O instruction emulation
CVE-2013-4355 Kernel: Xen: Xsa-63: information leak via I/O instruction emula...
Status: CLOSED ERRATA
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=20130930,repor...
: Security
Depends On: 1009602 1009603 1013748
Blocks: 1009007
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Reported: 2013-09-18 12:42 EDT by Prasad J Pandit
Modified: 2015-03-24 03:13 EDT (History)
15 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2015-03-23 04:55:37 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Prasad J Pandit 2013-09-18 12:42:34 EDT
Insufficient or missing error handling in certain routines dealing
with guest memory reads can lead to uninitialized data on the
hypervisor stack (potentially containing sensitive data from prior
work the hypervisor performed) being copied to guest visible storage.

This allows a malicious HVM guest to craft certain operations (namely,
but not limited to, port or memory mapped I/O writes) involving
physical or virtual addresses that have no actual memory associated
with them, so that hypervisor stack contents are copied into the
destination of the operation, thus becoming visible to the guest.

A malicious HVM guest could use this flaw to read data relating to other
guests.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 1 Prasad J Pandit 2013-09-18 12:47:22 EDT
Statement:

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

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 6 Vincent Danen 2013-09-30 13:04:27 EDT
This is now public:

http://www.openwall.com/lists/oss-security/2013/09/30/1
Comment 7 Vincent Danen 2013-09-30 13:12:29 EDT
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1013748]
Comment 8 Fedora Update System 2013-10-13 15:48:20 EDT
xen-4.3.0-7.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 Fedora Update System 2013-10-14 03:00:15 EDT
xen-4.2.3-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 Fedora Update System 2013-10-14 03:01:31 EDT
xen-4.2.3-3.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 11 Fedora Update System 2013-10-14 13:11:18 EDT
xen-4.2.3-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Fedora Update System 2013-10-14 13:19:53 EDT
xen-4.2.3-3.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 13 errata-xmlrpc 2013-12-05 12:29:49 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:1790 https://rhn.redhat.com/errata/RHSA-2013-1790.html

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