Bug 1160664 (CVE-2014-8594, xsa109)

Summary: CVE-2014-8594 kernel: xen: Insufficient restrictions on certain MMU update hypercalls (xsa109)
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: agordeev, dhoward, drjones, imammedo, lwang, mguzik, mrezanin, nmurray, pbonzini, pholasek, plougher, rkrcmar, rvrbovsk, 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: 2014-11-05 15:16:46 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: 1165205    
Bug Blocks: 1160648    

Description Petr Matousek 2014-11-05 10:45:48 UTC 
MMU update operations targeting page tables are intended to be used on
PV guests only. The lack of a respective check made it possible for
such operations to access certain function pointers which remain NULL
when the target guest is using Hardware Assisted Paging (HAP).

Malicious or buggy stub domain kernels or tool stacks otherwise living
outside of Domain0 can mount a denial of service attack which, if
successful, can affect the whole system.

Acknowledgements:

Red Hat would like to thank the Xen for reporting this issue.
Comment 5 Petr Matousek 2014-11-05 15:16:46 UTC 
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.
Comment 6 Vincent Danen 2014-11-18 14:46:50 UTC 
External References:

http://xenbits.xen.org/xsa/advisory-109.html
Comment 7 Vincent Danen 2014-11-18 14:47:55 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1165205]