Vulnerability CVE-2010-4255
Published: 2011-01-24   Modified: 2012-02-13

Description:
The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

Type:

CWE-Other

CVSS2 => (AV:A/AC:L/Au:N/C:N/I:N/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.1/10
6.9/10
6.5/10
Exploit range
Attack complexity
Authentication
Adjacent network
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Complete
Affected software
Citrix -> XEN 

 References:
http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.html
http://openwall.com/lists/oss-security/2010/11/30/5
http://openwall.com/lists/oss-security/2010/11/30/8
http://www.redhat.com/support/errata/RHSA-2011-0017.html
http://www.securityfocus.com/archive/1/520102/100/0/threaded
http://www.vmware.com/security/advisories/VMSA-2011-0012.html
https://bugzilla.redhat.com/show_bug.cgi?id=658155
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