OracleVM 3.2 : xen (OVMSA-2016-0104)

high Nessus Plugin ID 93397

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 :

- From: Andrew Cooper Subject: x86/shadow: Avoid overflowing sh_ctxt->seg_reg[] hvm_get_seg_reg does not perform a range check on its input segment, calls hvm_get_segment_register and writes straight into sh_ctxt->seg_reg[]. x86_seg_none is outside the bounds of sh_ctxt->seg_reg[], and will hit a BUG in [vmx,svm]_get_segment_register. HVM guests running with shadow paging can end up performing a virtual to linear translation with x86_seg_none. This is used for addresses which are already linear. However, none of this is a legitimate pagetable update, so fail the emulation in such a case. This is XSA-187 (CVE-2016-7094)

- x86/32on64: don't allow recursive page tables from L3 L3 entries are special in PAE mode, and hence can't reasonably be used for setting up recursive (and hence linear) page table mappings. Since abuse is possible when the guest in fact gets run on 4-level page tables, this needs to be excluded explicitly. This is XSA-185.

Conflict: xen/arch/x86/mm.c (CVE-2016-7092)

Solution

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

See Also

http://www.nessus.org/u?26ce459d

Plugin Details

Severity: High

ID: 93397

File Name: oraclevm_OVMSA-2016-0104.nasl

Version: 2.16

Type: local

Published: 9/9/2016

Updated: 1/4/2021

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C

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

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

Vulnerability Information

CPE: p-cpe:/a:oracle:vm:xen, p-cpe:/a:oracle:vm:xen-devel, p-cpe:/a:oracle:vm:xen-tools, cpe:/o:oracle:vm_server:3.2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2016

Vulnerability Publication Date: 9/21/2016

Reference Information

CVE: CVE-2016-7092, CVE-2016-7094