Xen para-virtualized framebuffer (PVFB) description denial of service

xen-pvfb-description-dos (42387) The risk level is classified as MediumMedium Risk

Description:

Xen is vulnerable to a buffer overflow, caused by improper bounds checking by hypervisor's para-virtualized framebuffer (PVFB). A local attacker could exploit this vulnerability using a malformed frontend framebuffer description to crash the application or execute arbitrary code in the privileged domain (Dom0).

*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 RHSA-2008-0194 for patch, upgrade or suggested workaround information. See References.

References:

  • Xen Web site: Xen Community.
  • BID-29183: Xen Para Virtualized Frame Buffer Backend Local Buffer Overflow Vulnerability
  • CVE-2008-1943: Buffer overflow in the backend of XenSource Xen Para Virtualized Frame Buffer (PVFB) 3.0 through 3.1.2 allows local users to cause a denial of service (crash) and possibly execute arbitrary code via a crafted description of a shared framebuffer.
  • RHSA-2008-0194: Important: xen security and bug fix update
  • SA30781: Xen PVFB Shared Framebuffer Processing Vulnerability
  • SECTRACK ID: 1020008: Xen PVFB Bugs Let Local Users Deny Service or Gain Elevated Privileges

Platforms Affected:

  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5 Server
  • RedHat Enterprise Linux 5.1.z EUS
  • RedHat RHEL Desktop Multi OS 5 Client
  • RedHat RHEL Virtualization 5 Server
  • RedHat RHEL Virtualization 5.1.z EUS
  • XenSource Xen 3.0
  • XenSource Xen 3.0.2
  • XenSource Xen 3.0.3
  • XenSource Xen 3.0.4
  • XenSource Xen 3.1.2

Reported:

May 13, 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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