Bug 1195298 (CVE-2015-2045, xsa122)

Summary: CVE-2015-2045 xen: information leak via version information hypercall (XSA-122)
Product: [Other] Security Response Reporter: Martin Prpič <mprpic>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: drjones, imammedo, jrusnack, mrezanin, pbonzini, pmatouse, rkrcmar, security-response-team, vkuznets
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-02-24 11:45:14 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1195308    
Attachments:
Description Flags
XSA-122 upstream patch for CVE-2015-2045 none

Description Martin Prpič 2015-02-23 14:54:51 UTC 
ISSUE DESCRIPTION
=================

The code handling certain sub-operations of the HYPERVISOR_xen_version
hypercall fails to fully initialize all fields of structures
subsequently copied back to guest memory. Due to this hypervisor stack
contents are copied into the destination of the operation, thus
becoming visible to the guest.

IMPACT
======

A malicious 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.
Comment 1 Martin Prpič 2015-02-23 14:57:56 UTC 
Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 2 Martin Prpič 2015-02-23 15:07:15 UTC 
Created attachment 994405 [details]
XSA-122 upstream patch for CVE-2015-2045
Comment 4 Petr Matousek 2015-02-24 11:45:14 UTC 
Statement:

This issue does affect the Xen hypervisor as shipped with Red Hat Enterprise Linux 5.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Comment 5 Martin Prpič 2015-03-06 09:22:04 UTC 
External References:

http://xenbits.xen.org/xsa/advisory-122.html