Bug 1187148 (CVE-2015-0268)

Summary: CVE-2015-0268 xen: GICD_SGIR is not properly emulated on ARM architecture (XSA-117)
Product: [Other] Security Response Reporter: Vasyl Kaigorodov <vkaigoro>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: pmatouse, security-response-team
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: 2015-02-20 14:01:21 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: 1194675    
Bug Blocks: 1190624    

Description Vasyl Kaigorodov 2015-01-29 12:25:12 UTC 
ISSUE DESCRIPTION
=================

When decoding a guest write to a specific register in the virtual
interrupt controller Xen would treat an invalid value as a critical
error and crash the host.

IMPACT
======

By writing an invalid value to the GICD.SGIR register a guest can
crash the host, resulting in a Denial of Service attack.

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

Xen 4.5 and later systems running on ARM hardware with version 2 of
the generic interrupt controller are vulnerable.

Systems running on ARM hardware with version 3 of the generic
interrupt controller are not vulnerable.

x86 systems are not affected.

Statement:

This issue did not affect the versions of xen as shipped with Red Hat Enterprise Linux 5.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 1 Kurt Seifried 2015-02-12 22:34:58 UTC 
This is now public:

http://seclists.org/oss-sec/2015/q1/534
Comment 2 Petr Matousek 2015-02-20 14:01:05 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1194675]