Linux kernel Xen hypervisor block backend driver denial of service

linux-kernel-xen-hypervisor-dos (42274) The risk level is classified as MediumMedium Risk

Description:

Linux kernel, when running on a 64-bit host with a 32-bit paravirtualized guest, is vulnerable to a denial of service caused by the failure to perform sanity checks by the Xen hypervisor block backend driver. By sending a specially-crafted request for an overly large number of blocks, a local authenticated attacker on the Guest OS could cause the Host OS to crash.

*CVSS:

Base Score: 1.7
  Access Vector: Local
  Access Complexity: Low
  Authentication: Single
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 1.3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to Red Hat Bugzilla Bug 369531 for patch, upgrade or suggested workaround information. See References.

References:

  • Red Hat Bugzilla Bug 369531: CVE-2007-5498 missing sanity check in xen block backend driver.
  • The Linux Kernel Archives Web site: The Linux Kernel Archives.
  • BID-29082: Linux Kernel '/include/xen/blkif.h' 32-on-64 Support Denial Of Service Vulnerability
  • CVE-2007-5498: The Xen hypervisor block backend driver for Linux kernel 2.6.18, when running on a 64-bit host with a 32-bit paravirtualized guest, allows local privileged users in the guest OS to cause a denial of service (host OS crash) via a request that specifies a large number of blocks.
  • RHSA-2008-0233: Important: kernel security and bug fix update
  • USN-679-1: Linux kernel vulnerabilities

Platforms Affected:

  • Canonical Ubuntu 6.06 LTS
  • Canonical Ubuntu 7.10
  • Canonical Ubuntu 8.04 LTS
  • Canonical Ubuntu 8.10
  • Linux Linux Kernel 2.6.18.1
  • RedHat Enterprise Linux 5 Server
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5.1.z EUS
  • RedHat Enterprise Linux Desktop 5.0

Reported:

May 07, 2008

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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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