Bug 1499819 (CVE-2017-15589, xsa239) - CVE-2017-15589 xsa239 xen: hypervisor stack leak in x86 I/O intercept code (XSA-239)
Summary: CVE-2017-15589 xsa239 xen: hypervisor stack leak in x86 I/O intercept code (X...
Keywords:
Status: CLOSED WONTFIX
Alias: CVE-2017-15589, xsa239
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: 1501391
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-10-09 12:51 UTC by Adam Mariš
Modified: 2021-02-17 01:25 UTC (History)
13 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2019-06-08 03:27:10 UTC

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Description Adam Mariš 2017-10-09 12:51:24 UTC 
ISSUE DESCRIPTION
=================

Intercepted I/O operations may deal with less than a full machine
word's worth of data.  While read paths had been the subject of earlier
XSAs (and hence have been fixed), at least one write path was found
where the data stored into an internal structure could contain bits
from an uninitialized hypervisor stack slot.  A subsequent emulated
read would then be able to retrieve these bits.

IMPACT
======

A malicious unprivileged x86 HVM guest may be able to obtain sensitive
information from the host or other guests.

VULNERABLE SYSTEMS
==================

All Xen versions are vulnerable.

Only x86 systems are affected.  ARM systems are not affected.

Only HVM guests can leverage this vulnerability.  PV guests cannot
leverage this vulnerability.

MITIGATION
==========

Running only PV guests will avoid this issue.

External References:

http://xenbits.xen.org/xsa/advisory-239.html
Comment 1 Adam Mariš 2017-10-12 13:42:21 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1501391]
Comment 2 Adam Mariš 2017-10-18 15:05:20 UTC 
Acknowledgments:

Name: the Xen project
Upstream: Roger Pau Monné (Citrix)
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