Bug 1195290 (CVE-2015-2044, xsa121) - CVE-2015-2044 xen: information leak via internal x86 system device emulation (XSA-121)
Summary: CVE-2015-2044 xen: information leak via internal x86 system device emulation ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2015-2044, xsa121
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1195308
TreeView+ depends on / blocked
 
Reported: 2015-02-23 14:49 UTC by Martin Prpič
Modified: 2023-05-12 13:57 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-02-24 11:43:59 UTC
Embargoed:


Attachments (Terms of Use)
XSA-121 upstream patch for CVE-2015-2044 (1.33 KB, text/plain)
2015-02-23 15:06 UTC, Martin Prpič
no flags Details

Description Martin Prpič 2015-02-23 14:49:29 UTC
ISSUE DESCRIPTION
=================

Emulation routines in the hypervisor dealing with certain system
devices check whether the access size by the guest is a supported one.
When the access size is unsupported these routines failed to set the
data to be returned to the guest for read accesses, so that hypervisor
stack contents are copied into the destination of the operation, thus
becoming visible to the guest.

IMPACT
======

A malicious HVM guest might be able to read sensitive data relating
to other guests.

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

Xen 3.2.x and later are vulnerable.
Xen 3.1.x and earlier have not been inspected.

Only HVM guests can take advantage of this vulnerability.

Only x86 systems are vulnerable. ARM systems are not vulnerable.

MITIGATION
==========

Running only PV guests will avoid this issue.

Comment 1 Martin Prpič 2015-02-23 14:50:59 UTC
Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 2 Martin Prpič 2015-02-23 15:06:40 UTC
Created attachment 994404 [details]
XSA-121 upstream patch for CVE-2015-2044

Comment 5 Petr Matousek 2015-02-24 11:44:29 UTC
Statement:

Not vulnerable.

This issue does not affect the Xen hypervisor as shipped with Red Hat Enterprise Linux 5.

Comment 6 Martin Prpič 2015-03-06 09:20:08 UTC
External References:

http://xenbits.xen.org/xsa/advisory-121.html


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