SecurityTracker.com
Keep Track of the Latest Vulnerabilities
with SecurityTracker!
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 
Sign Up
Sign Up for Your FREE Weekly SecurityTracker E-mail Alert Summary
Instant Alerts
Buy our Premium Vulnerability Notification Service to receive customized, instant alerts
Affiliates
Put SecurityTracker Vulnerability Alerts on Your Web Site -- It's Free!
Partners
Become a Partner and License Our Database or Notification Service
Report a Bug
Report a vulnerability that you have found to SecurityTracker
bugs
@
securitytracker.com






Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen x86 Memory Paging Flaw Lets Local Guest System Users Deny Service on the Host System
SecurityTracker Alert ID:  1030723
SecurityTracker URL:  http://securitytracker.com/id/1030723
CVE Reference:   CVE-2014-5146, CVE-2014-5149   (Links to External Site)
Date:  Aug 13 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on a guest system can cause denial of service conditions on the host system.

A local user on an HVM guest can invoke certain long latency MMU virtualization operations that cannot be preempted to consume excessive vcpu resources [CVE-2014-5146 on guests Hardware Assisted Paging (HAP), CVE-2014-5149 on guests that don't use HAP].

A guest that has a large allocation of shadow/p2m RAM in excess of 128 GB can exploit this flaw to deny service on the host system.

x86 versions are affected.

ARM systems are not vulnerable.

Jan Beulich reported this vulnerability.

Impact:   A local user on a guest system can cause denial of service conditions on the target host system.
Solution:   The vendor has issued a fix for guest systems using HAP (xsa97-hap-4.2-prereq.patch, xsa97-hap-4.2.patch, xsa97-hap-4.3.patch, xsa97-hap-4.4.patch, xsa97-hap-unstable.patch).

No solution for was available at the time of this entry for guest systems using shadow pagetables and not HAP.

Vendor URL:  www.xen.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   None.


 Source Message Contents



[Original Message Not Available for Viewing]


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

Copyright 2017, SecurityGlobal.net LLC