Xen get_page_from_gfn() denial of service

xen-getpagefromgfn-dos (80480) The risk level is classified as MediumMedium Risk

Description:

Xen is vulnerable to a denial of service, caused by the failure to validate its input GFN by the get_page_from_gfn() function. An attacker could exploit this vulnerability using unknown attack vectors to reference memory outside of the frame table to cause the hypervisor to crash.

*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 32 for patch, upgrade or suggested workaround information. See References.

References:

  • Xen Security Advisory 32: several hypercalls do not validate input GFNs.
  • BID-56805: Xen 'get_page_from_gfn()' Function Local Denial of Service Vulnerability
  • CVE-2012-5525: The get_page_from_gfn hypercall function in Xen 4.2 allows local PV guest OS administrators to cause a denial of service (crash) via a crafted GFN that triggers a buffer over-read.
  • OSVDB ID: 88133: Xen get_page_from_gfn() Function GFN Input Handling Frame Table Out-of-bounds Read Local Privilege Escalation
  • SA51397: Xen Multiple Vulnerabilities

Platforms Affected:

  • 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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