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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