CVE-2012-3516 Information

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.

Reference

http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html http://secunia.com/advisories/50472 http://secunia.com/advisories/50530 http://support.citrix.com/article/CTX134708 http://wiki.xen.org/wiki/Security_AnnouncementsXSA-18_grant_table_entry_swaps_have_inadequate_bounds_checking http://www.openwall.com/lists/oss-security/2012/09/05/11 http://www.securityfocus.com/bid/55411