libvirt VirDomainGetVcpus() buffer overflow

libvirt-virdomaingetvcpus-bo (68271) The risk level is classified as HighHigh Risk


libvirt is vulnerable to a heap-based buffer overflow, caused by an integer overflow in the VirDomainGetVcpus() function. By sending an overly long request, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the libvirtd daemon to crash.


Base Score: 7.5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
Temporal Score: 5.5
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Gain Access


Upgrade to the latest version of libvirt (0.9.3 or later), available from the libvirt Web site. See References.


  • libvirt Web site: libvirt: The virtualization API.
  • Red Hat Web site: [libvirt] [PATCH 2/2] remote: protect against integer overflow.
  • BID-48478: libvirt 'VirDomainGetVcpus()' Function Remote Integer Overflow Heap Corruption Vulnerability
  • CVE-2011-2511: Integer overflow in libvirt before 0.9.3 allows remote authenticated users to cause a denial of service (libvirtd crash) and possibly execute arbitrary code via a crafted VirDomainGetVcpus RPC call that triggers memory corruption.
  • DSA-2280: libvirt -- several vulnerabilities
  • OSVDB ID: 73668: libvirt src/libvirt.c virDomainGetVcpus() Function Request Parsing Remote Overflow
  • RHSA-2011-1019: Moderate: libvirt security, bug fix, and enhancement update
  • RHSA-2011-1197: Moderate: libvirt security and bug fix update
  • SA44988: libvirt virDomainGetVcpus() Integer Overflow Vulnerability

Platforms Affected:

  • libvirt libvirt 0.9.2
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Server EUS 6.1.z
  • RedHat RHEL Desktop Multi OS 5 Client
  • RedHat RHEL Virtualization 5 Server


Jun 24, 2011

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