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Category:   Application (Generic)  >   Xen Vendors:   Citrix
Xen PVFB Format Validation Bug Lets Local Users Deny Service or Gain Elevated Privileges
SecurityTracker Alert ID:  1020009
SecurityTracker URL:  http://securitytracker.com/id/1020009
CVE Reference:   CVE-2008-1944   (Links to External Site)
Date:  May 13 2008
Impact:   Denial of service via local system, User access via local system


Description:   A vulnerability was reported in Xen. A local user can obtain elevated privileges on the target system. A local user can cause denial of service conditions.

The hypervisor's para-virtualized framebuffer (PVFB) backend does not properly validate the format of user-supplied input that update the frontend's framebuffer. A local user can supply a specially crafted value to cause the backend to crash or potentially execute arbitrary code in the privileged domain (dom0).

Daniel P. Berrange reported this vulnerability.

Impact:   A local user can obtain elevated privileges on the target system.

A local user can cause denial of service conditions on the target system.

Solution:   No solution was available at the time of this entry.

[Editor's note: A fix is available for Red Hat Enterprise Linux. A separate Alert will be issued for Red Hat.]

Vendor URL:  www.xensource.com/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 13 2008 (Red Hat Issues Fix) Xen PVFB Format Validation Bug Lets Local Users Deny Service or Gain Elevated Privileges
Red Hat has released a fix for Red Hat Enterprise Linux 5.



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