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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