Xen guest_physmap_mark_populate_on_demand() denial of service

xen-guestphysmapmark-dos (80483) The risk level is classified as MediumMedium Risk

Description:

Xen is vulnerable to a denial of service, caused by an error in the guest_physmap_mark_populate_on_demand() function when checking that the subject GFNs are not in use. An attacker could exploit this vulnerability using unknown attack vectors to cause the application to hang.

*CVSS:

Base Score: 2.1
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 1.6
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to Xen Security Advisory 30 for patch, upgrade or suggested workaround information. See References.

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

References:

  • CTX135777: Citrix XenServer Multiple Security Updates.
  • Xen Security Advisory 30: Broken error handling in guest_physmap_mark_populate_on_demand().
  • BID-56803: Xen CVE-2012-5514 Local Denial of Service Vulnerability
  • CVE-2012-5514: The guest_physmap_mark_populate_on_demand function in Xen 4.2 and earlier does not properly unlock the subject GFNs when checking if they are in use, which allows local guest HVM administrators to cause a denial of service (hang) via unspecified vectors.
  • DSA-2582: xen -- several vulnerabilities
  • OSVDB ID: 88130: Xen guest_physmap_mark_populate_on_demand() Function Subject GFN Use Check Local DoS
  • SA51397: Xen Multiple Vulnerabilities
  • SA51486: Citrix XenServer Multiple Vulnerabilities

Platforms Affected:

  • Citrix XenServer 5.0
  • Citrix XenServer 5.5
  • Citrix XenServer 5.6
  • Citrix XenServer 6.0
  • Citrix XenServer 6.1
  • XenSource Xen 3.0
  • XenSource Xen 4.1
  • XenSource Xen 4.1.1
  • XenSource Xen 4.1.2

Reported:

Dec 03, 2012

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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