SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Debug Exception Handling Flaw Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1040882
SecurityTracker URL:  http://securitytracker.com/id/1040882
CVE Reference:   CVE-2018-8897   (Links to External Site)
Date:  May 10 2018
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.6.x, 4.7.x, 4.8.x, 4.9.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

The system does not properly handle debug exceptions delivered after a stack switch operation via mov SS or pop SS instructions. During the stack switch operation, the exceptions are deferred. As a result, a local user on a PV guest system can gain elevated privileges on the host system.

x86 systems are affected.

Nick Peterson, Everdox Tech LLC, and Andy Lutomirski reported this vulnerability.

Impact:   A local user on the PV guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa260-1.patch, xsa260-2.patch, xsa260-3.patch, and xsa260-4.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-260.html

Vendor URL:  xenbits.xen.org/xsa/advisory-260.html (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 10 2018 (Citrix Issues Fix for Citrix XenServer) Xen Debug Exception Handling Flaw Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System
Citrix has issued a fix for Citrix XenServer.



 Source Message Contents



[Original Message Not Available for Viewing]


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2019, SecurityGlobal.net LLC