The HVMOP_set_mem_type control in Xen 4.1 through 4.4.x allows local guest HVM administrators to cause a denial of service (hypervisor crash) or possibly execute arbitrary code by leveraging a separate qemu-dm vulnerability to trigger invalid page table translations for unspecified memory page types.
CVSS Severity (version 2.0):
Impact Subscore: 8.5
Exploitability Subscore: 5.1
CVSS Version 2 Metrics:
Access Vector: Local network exploitable
Access Complexity: Low
Authentication: Required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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[oss-security] 20140429 Xen Security Advisory 92 - HVMOP_set_mem_type allows invalid P2M entries to be created
[oss-security] 20140430 Re: Xen Security Advisory 92 - HVMOP_set_mem_type allows invalid P2M entries to be created
Advisory; Patch Information