Xen PV domain builder denial of service

xen-pvdomainbuilder-dos (79617) The risk level is classified as MediumMedium Risk

Description:

Xen is vulnerable to a denial of service, caused by the failure to validate the kernel size or ramdisk prior to compression by the PV domain builder. A local attacker could exploit this vulnerability using an overly large kernel image to cause the application 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 XenSource Web site for patch, upgrade or suggested workaround information. See References.

References:

  • oss-security: Xen.org security team | 26 Oct: Xen Security Advisory 25 (CVE-2012-4544) - Xen domain builder Out-of-memory due to malicious kernel/ramdisk.
  • XenSource Web site: Xen.
  • BID-56289: Xen PV Domain Builder Kernel Decompression Local Denial Of Service Vulnerability
  • CVE-2012-4544: The PV domain builder in Xen 4.2 and earlier does not validate the size of the kernel or ramdisk (1) before or (2) after decompression, which allows local guest administrators to cause a denial of service (domain 0 memory consumption) via a crafted (a) kernel or (b) ramdisk.
  • DSA-2636: xen -- several vulnerabilities
  • OSVDB ID: 86619: Xen PV Domain Builder Kernel / Ramdisk Decompression Memory Exhaustion Local DoS
  • RHSA-2013-0241: Moderate: xen security update
  • SA51071: Xen PV Domain Builder Kernel Decompression Denial of Service Vulnerability

Platforms Affected:

  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat RHEL Desktop Multi OS 5 Client
  • RedHat RHEL Virtualization 5 Server
  • XenSource Xen 4.1
  • XenSource Xen 4.1.1
  • XenSource Xen 4.1.2
  • XenSource Xen 4.2

Reported:

Oct 26, 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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