Xen PHYSDEVOP privilege escalation

xen-cve20141666-priv-esc (90675) The risk level is classified as MediumMedium Risk

Description:

Xen could allow a local attacker to gain elevated privileges on the system, caused by missing checks in the PHYSDEVOP_[prepare,release]_msix operations. An attacker could exploit this vulnerability to gain elevated privileges on the system and cause the system to crash.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Refer to XSA-87 for patch, upgrade or suggested workaround information. See References.

References:

  • XSA-87: Xen Security Advisory 87 (CVE-2014-1666) - PHYSDEVOP_{prepare,release}_msix exposed to unprivileged guests.
  • BID-65125: Xen 'PHYSDEVOP_{prepare,release}_msix' Operations Local Privilege Escalation Vulnerability
  • CVE-2014-1666: The do_physdev_op function in Xen 4.1.5, 4.1.6.1, 4.2.2 through 4.2.3, and 4.3.x does not properly restrict access to the (1) PHYSDEVOP_prepare_msix and (2) PHYSDEVOP_release_msix operations, which allows local PV guests to cause a denial of service (host or guest malfunction) or possibly gain privileges via unspecified vectors.

Platforms Affected:

  • XenSource Xen 4.1.5
  • XenSource Xen 4.1.6.1
  • XenSource Xen 4.2.2

Reported:

Jan 24, 2014

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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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