Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Citrix | Xen | <= 4.0.1 |
References
- http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.htmlPatch
- http://openwall.com/lists/oss-security/2010/11/30/5Patch
- http://openwall.com/lists/oss-security/2010/11/30/8Patch
- http://secunia.com/advisories/42884
- http://secunia.com/advisories/46397
- 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=658155Patch
- http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.htmlPatch
- http://openwall.com/lists/oss-security/2010/11/30/5Patch
- http://openwall.com/lists/oss-security/2010/11/30/8Patch
- http://secunia.com/advisories/42884
- http://secunia.com/advisories/46397
- http://www.redhat.com/support/errata/RHSA-2011-0017.html
FAQ
What is CVE-2010-4255?
CVE-2010-4255 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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_...
How severe is CVE-2010-4255?
CVE-2010-4255 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2010-4255?
Check the references section above for vendor advisories and patch information. Affected products include: Citrix Xen.