libvirt API calls denial of service

libvirt-apicalls-dos (66012) The risk level is classified as MediumMedium Risk

Description:

libvirt could allow a remote attacker to cause a denial of service, caused by a failure to honor read only connections by the virNodeDeviceDettach, virNodeDeviceReset, virNodeDeviceReAttach, virDomainRevertToSnapshot, virNodeDeviceReAttach, and virDomainSnapshotDelete API calls. An attacker could exploit this vulnerability to cause the server to crash.

*CVSS:

Base Score: 7.8
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 5.8
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Apply the appropriate patch for your system. See References.

References:

  • libvirt Web site: libvirt: The virtualization API.
  • Red Hat Bugzilla Bug 683650 : libvirt: several API calls do not honour read-only connection.
  • BID-46820: libvirt Multiple Remote Denial Of Service Vulnerabilities
  • CVE-2011-1146: libvirt.c in the API in Red Hat libvirt 0.8.8 does not properly restrict operations in a read-only connection, which allows remote attackers to cause a denial of service (host OS crash) or possibly execute arbitrary code via a (1) virNodeDeviceDettach, (2) virNodeDeviceReset, (3) virDomainRevertToSnapshot, (4) virDomainSnapshotDelete, (5) virNodeDeviceReAttach, or (6) virConnectDomainXMLToNative call, a different vulnerability than CVE-2008-5086.
  • DSA-2194: libvirt -- insufficient checks
  • RHSA-2011-0391: Important: libvirt security update
  • SA43670: libvirt Read-Only API Calls Security Bypass Security Issue
  • SUSE-SR:2011:007: SUSE Security Summary Report

Platforms Affected:

  • libvirt libvirt 0.6.1
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Server EUS 6.0.z
  • RedHat RHEL Desktop Multi OS 5 Client
  • RedHat RHEL Virtualization 5 Server

Reported:

Mar 09, 2011

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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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