Xen AMD CPU erratum 793 denial of service

xen-cve20136885-dos (89335) The risk level is classified as LowLow Risk

Description:

Xen is vulnerable to a denial of service when running on AMD 16h 00h-0Fh processors, caused by an error when handling interactions between locked instructions and write-combined memory types. A local attacker on an HVM guest could exploit this vulnerability to cause the host operating system to become unresponsive.

*CVSS:

Base Score: 1.9
  Access Vector: Local
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 1.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Apply the patch for this vulnerability (xsa82.patch), available from the XenSource Web site. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • Red Hat Bugzilla Bug 1035823: (CVE-2013-6885) CVE-2013-6885 hw: AMD CPU erratum may cause core hang.
  • XenSource Web site: Xen.
  • XSA-82: (CVE-2013-6885) - Guest triggerable AMD CPU erratum may cause host hang.
  • XSA-82: Xen Security Advisory 82 (CVE-2013-6885) - Guest triggerable AMD CPU erratum may cause host hang.
  • BID-63983: AMD 16h Model Processor CVE-2013-6885 Local Denial of Service Vulnerability
  • CVE-2013-6885: The microcode on AMD 16h 00h through 0Fh processors does not properly handle the interaction between locked instructions and write-combined memory types, which allows local users to cause a denial of service (system hang) via a crafted application, aka the errata 793 issue.
  • RHSA-2014-0285: Important: kernel security, bug fix, and enhancement update
  • SA55840: Xen AMD CPU Core Denial of Service Vulnerability
  • SA56407: Citrix XenServer Two Denial of Service Vulnerabilities

Platforms Affected:

  • Citrix XenServer 5.6
  • Citrix XenServer 6.0
  • Citrix XenServer 6.1
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • XenSource Xen 3.3.0
  • XenSource Xen 4.1
  • XenSource Xen 4.1.2
  • XenSource Xen 4.2
  • XenSource Xen 4.3.0

Reported:

Dec 01, 2013

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