Bug 1058395 (CVE-2014-1666)

Summary: CVE-2014-1666 xen: PHYSDEVOP_{prepare,release}_msix exposed to unprivileged guests
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: agordeev, anton, dhoward, drjones, imammedo, jforbes, jkurik, kraxel, lwang, m.a.young, mrezanin, pbonzini, pholasek, plougher, rkrcmar, rvrbovsk, virt-maint, xen-maint
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: 2014-01-27 17:32:01 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1058398    
Bug Blocks: 1058399    

Description Petr Matousek 2014-01-27 17:30:46 UTC
The PHYSDEVOP_{prepare,release}_msix operations are supposed to be available to privileged guests (domain 0 in non-disaggregated setups) only, but the necessary privilege check was missing.

Malicious or misbehaving unprivileged guests can cause the host or other guests to malfunction. This can result in host-wide denial of service. Privilege escalation, while seeming to be unlikely, cannot be excluded.

References:
http://seclists.org/oss-sec/2014/q1/150

Acknowledgements:

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

Comment 1 Petr Matousek 2014-01-27 17:32:01 UTC
Statement:

Not vulnerable.

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

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2 as we did not have support for Xen hypervisor.

Comment 2 Petr Matousek 2014-01-27 17:32:39 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1058398]