Description
The GNTTABOP_swap_grant_ref sub-operation in the grant table hypercall in Xen 4.2 and Citrix XenServer 6.0.2 allows local guest kernels or administrators to cause a denial of service (host crash) and possibly gain privileges via a crafted grant reference that triggers a write to an arbitrary hypervisor memory location.
References
- 55411 vdb-entry
- 50530 third-party-advisory
- [oss-security] 20120905 Xen Security Advisory 18 (CVE-2012-3516) - grant table entry swaps have inadequate bounds checking mailing-list
- 50472 third-party-advisory
- http://support.citrix.com/article/CTX134708
- http://wiki.xen.org/wiki/Security_Announcements#XSA-18_grant_table_entry_swaps_have_inadequate_bounds_checking
- SUSE-SU-2012:1133 vendor-advisory