OracleVM 3.3 : xen (OVMSA-2016-0171)

Low Nessus Plugin ID 95618

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 :

- qemu_up: ioport_read, ioport_write: be defensive about 32-bit addresses On x86, ioport addresses are 16-bit.
That these functions take 32-bit arguments is a mistake.
Changing the argument type to 16-bit will discard the top bits of any erroneous values from elsewhere in qemu.
Also, check just before use that the value is in range.
(This turns an ill-advised change to MAX_IOPORTS into a possible guest crash rather than a privilege escalation vulnerability.) And, in the Xen ioreq processor, clamp incoming ioport addresses to 16-bit values. Xen will never write >16-bit values but the guest may have access to the ioreq ring. We want to defend the rest of the qemu code from wrong values. This is XSA-199.
(CVE-2016-9637)

- qemu: ioport_read, ioport_write: be defensive about 32-bit addresses On x86, ioport addresses are 16-bit.
That these functions take 32-bit arguments is a mistake.
Changing the argument type to 16-bit will discard the top bits of any erroneous values from elsewhere in qemu.
Also, check just before use that the value is in range.
(This turns an ill-advised change to MAX_IOPORTS into a possible guest crash rather than a privilege escalation vulnerability.) And, in the Xen ioreq processor, clamp incoming ioport addresses to 16-bit values. Xen will never write >16-bit values but the guest may have access to the ioreq ring. We want to defend the rest of the qemu code from wrong values. This is XSA-199.
(CVE-2016-9637)

Solution

Update the affected xen / xen-tools packages.

See Also

http://www.nessus.org/u?f42439e2

Plugin Details

Severity: Low

ID: 95618

File Name: oraclevm_OVMSA-2016-0171.nasl

Version: 3.14

Type: local

Published: 2016/12/08

Updated: 2019/09/27

Dependencies: 12634

Risk Information

Risk Factor: Low

CVSS v2.0

Base Score: 3.7

Temporal Score: 2.7

Vector: CVSS2#AV:L/AC:H/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:oracle:vm:xen, p-cpe:/a:oracle:vm:xen-tools, cpe:/o:oracle:vm_server:3.3

Required KB Items: Host/local_checks_enabled, Host/OracleVM/release, Host/OracleVM/rpm-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/12/07

Vulnerability Publication Date: 2017/02/17

Reference Information

CVE: CVE-2016-9637