OracleVM 3.1 : xen (OVMSA-2012-0039)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.

Synopsis :

The remote OracleVM host is missing one or more security updates.

Description :

The remote OracleVM system is missing necessary patches to address
critical security updates :

- console: bounds check whenever changing the cursor due
to an escape code The device model used by fully
virtualised (HVM) domains, qemu, does not properly
handle escape VT100 sequences when emulating certain
devices with a virtual console backend. (CVE-2012-3515)

- x86/pvhvm: properly range-check
with MAP_PIRQ_TYPE_GSI does not range check map->index.
This is being used as a array index, and hence must be
validated before use. A malicious HVM guest kernel can
crash the host. It might also be able to read hypervisor
or guest memory. (CVE-2012-3496)

- xen: Don't BUG_ON PoD operations on a non-translated
guest. XENMEM_populate_physmap can be called with
invalid flags. By calling it with
MEMF_populate_on_demand flag set, a BUG can be triggered
if a translating paging mode is not being used.

- xen: handle out-of-pirq condition correctly in
PHYSDEVOP_get_free_pirq PHYSDEVOP_get_free_pirq does not
check that its call to get_free_pirq succeeded, and if
it fails will use the error code as an array index.

- xen: prevent a 64 bit guest setting reserved bits in DR7
The upper 32 bits of this register are reserved and
should be written as zero. (CVE-2012-3494)

See also :

Solution :

Update the affected xen / xen-devel / xen-tools packages.

Risk factor :

High / CVSS Base Score : 7.2
CVSS Temporal Score : 5.3
Public Exploit Available : false

Family: OracleVM Local Security Checks

Nessus Plugin ID: 79482 ()

Bugtraq ID: 55400

CVE ID: CVE-2012-3494

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