Bug 1195290 – CVE-2015-2044 xen: information leak via internal x86 system device emulation (XSA-121)

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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 ...

Status:	CLOSED NOTABUG

Aliases:	CVE-2015-2044, xsa121

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20150306,reported=2...
Keywords:	Security

Depends On:
Blocks:	1195308
	Show dependency tree / graph

Reported:	2015-02-23 09:49 EST by Martin Prpič
Modified:	2015-03-09 04:42 EDT (History)
CC List:	9 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-02-24 06:43:59 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
XSA-121 upstream patch for CVE-2015-2044 (1.33 KB, text/plain) 2015-02-23 10:06 EST, Martin Prpič	no flags	Details
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Martin Prpič 2015-02-23 09:49:29 EST

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 09:50:59 EST

Acknowledgements:

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

Comment 2 Martin Prpič 2015-02-23 10:06:40 EST

Created attachment 994404 [details]
XSA-121 upstream patch for CVE-2015-2044

Comment 5 Petr Matousek 2015-02-24 06:44:29 EST

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 04:20:08 EST

External References:

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

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