Bug 950686 (CVE-2013-1919)

Summary:	CVE-2013-1919 kernel: xen: Several access permission issues with IRQs for unprivileged guests
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjones, imammedo, lersek, pbonzini, 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:	2013-05-13 08:01:36 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:	953568
Bug Blocks:	950673

Description Petr Matousek 2013-04-10 16:34:03 UTC

Various IRQ related access control operations may not have the intended effect, thus potentially permitting a stub domain to gran its client domain access to an IRQ it doesn't have access to itself.

Malicious or buggy stub domains kernels can mount a denial of service attack possibly affecting the whole system.

Only Xen systems using stub domains are vulnerable.

Only HVM guests with passed-through IRQs or PCI devices are able to exploit the vulnerability.

Acknowledgements:

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

Comment 1 Petr Matousek 2013-04-10 16:36:24 UTC

Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5 as it has no support for stub domains.

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.

Comment 7 Petr Matousek 2013-04-18 13:43:23 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 953568]

Comment 8 Fedora Update System 2013-05-05 02:25:03 UTC

xen-4.1.5-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2013-05-05 02:25:39 UTC

xen-4.2.2-1.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.