QEMU KVM virtio-blk driver privilege escalation

kvm-virtioblk-priv-escalation (67062) The risk level is classified as HighHigh Risk

Description:

QEMU KVM could allow a local attacker to gain elevated privileges on the system, caused by buffer overflow errors in the virtio_blk_handle_write() and virtio_blk_handle_read() functions. By sending specially-crafted requests to the virtio-blk driver, a local attacker could exploit this vulnerability to cause a denial of service or gain elevated privileges on the system.

*CVSS:

Base Score: 4.6
  Access Vector: Local
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 3.4
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Privileges

Remedy:

Refer to QEMU GIT Repository for patch, upgrade or suggested workaround information. See References.

References:

  • QEMU GIT Repository: QEMU.
  • QEMU Web page: QEMU.
  • Qemu-devel: virtio-blk.c handling of i/o which is not a 512 multiple.
  • BID-47546: QEMU KVM 'virtio-blk' Driver Local Privilege Escalation Vulnerability
  • CVE-2011-1750: Multiple heap-based buffer overflows in the virtio-blk driver (hw/virtio-blk.c) in qemu-kvm 0.14.0 allow local guest users to cause a denial of service (guest crash) and possibly gain privileges via a (1) write request to the virtio_blk_handle_write function or (2) read request to the virtio_blk_handle_read function that is not properly aligned.
  • DSA-2230: qemu-kvm -- several vulnerabilities
  • OSVDB ID: 73756: KVM qemu-kvm hw/virtio-blk.c Multiple Function Local DoS
  • RHSA-2011-0534: Important: qemu-kvm security, bug fix, and enhancement update
  • SA44132: KVM qemu-kvm virtio-blk Driver Buffer Overflow Vulnerabilities

Platforms Affected:

  • Fabrice Bellard QEMU 0.14.0
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6

Reported:

Mar 30, 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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