openSUSE Security Update : xen (openSUSE-2018-454) (Meltdown)

High Nessus Plugin ID 109751

Synopsis

The remote openSUSE host is missing a security update.

Description

This update for xen to version 4.9.2 fixes several issues.

This feature was added :

- Added script, udev rule and systemd service to watch for vcpu online/offline events in a HVM domU. They are triggered via 'xl vcpu-set domU N'

These security issues were fixed :

- CVE-2018-8897: Prevent mishandling of debug exceptions on x86 (XSA-260, bsc#1090820)

- Handle HPET timers in IO-APIC mode correctly to prevent malicious or buggy HVM guests from causing a hypervisor crash or potentially privilege escalation/information leaks (XSA-261, bsc#1090822)

- Prevent unbounded loop, induced by qemu allowing an attacker to permanently keep a physical CPU core busy (XSA-262, bsc#1090823)

- CVE-2018-10472: x86 HVM guest OS users (in certain configurations) were able to read arbitrary dom0 files via QMP live insertion of a CDROM, in conjunction with specifying the target file as the backing file of a snapshot (bsc#1089152).

- CVE-2018-10471: x86 PV guest OS users were able to cause a denial of service (out-of-bounds zero write and hypervisor crash) via unexpected INT 80 processing, because of an incorrect fix for CVE-2017-5754 (bsc#1089635).

- CVE-2018-7540: x86 PV guest OS users were able to cause a denial of service (host OS CPU hang) via non-preemptable L3/L4 pagetable freeing (bsc#1080635).

- CVE-2018-7541: Guest OS users were able to cause a denial of service (hypervisor crash) or gain privileges by triggering a grant-table transition from v2 to v1 (bsc#1080662).

- CVE-2018-7542: x86 PVH guest OS users were able to cause a denial of service (NULL pointer dereference and hypervisor crash) by leveraging the mishandling of configurations that lack a Local APIC (bsc#1080634).

These non-security issues were fixed :

- bsc#1087252: Update built-in defaults for xenstored in stubdom, keep default to run xenstored as daemon in dom0

- bsc#1087251: Preserve xen-syms from xen-dbg.gz to allow processing vmcores with crash(1)

- bsc#1072834: Prevent unchecked MSR access error This update was imported from the SUSE:SLE-12-SP3:Update update project.

Solution

Update the affected xen packages.

See Also

https://bugzilla.opensuse.org/show_bug.cgi?id=1027519

https://bugzilla.opensuse.org/show_bug.cgi?id=1072834

https://bugzilla.opensuse.org/show_bug.cgi?id=1080634

https://bugzilla.opensuse.org/show_bug.cgi?id=1080635

https://bugzilla.opensuse.org/show_bug.cgi?id=1080662

https://bugzilla.opensuse.org/show_bug.cgi?id=1087251

https://bugzilla.opensuse.org/show_bug.cgi?id=1087252

https://bugzilla.opensuse.org/show_bug.cgi?id=1089152

https://bugzilla.opensuse.org/show_bug.cgi?id=1089635

https://bugzilla.opensuse.org/show_bug.cgi?id=1090820

https://bugzilla.opensuse.org/show_bug.cgi?id=1090822

https://bugzilla.opensuse.org/show_bug.cgi?id=1090823

https://features.opensuse.org/

Plugin Details

Severity: High

ID: 109751

File Name: openSUSE-2018-454.nasl

Version: 1.8

Type: local

Agent: unix

Published: 2018/05/14

Updated: 2019/04/05

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

Temporal Score: 6.3

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

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

CVSS v3.0

Base Score: 8.8

Temporal Score: 8.4

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

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

Vulnerability Information

CPE: p-cpe:/a:novell:opensuse:xen, p-cpe:/a:novell:opensuse:xen-debugsource, p-cpe:/a:novell:opensuse:xen-devel, p-cpe:/a:novell:opensuse:xen-doc-html, p-cpe:/a:novell:opensuse:xen-libs, p-cpe:/a:novell:opensuse:xen-libs-debuginfo, p-cpe:/a:novell:opensuse:xen-tools, p-cpe:/a:novell:opensuse:xen-tools-debuginfo, p-cpe:/a:novell:opensuse:xen-tools-domU, p-cpe:/a:novell:opensuse:xen-tools-domU-debuginfo, cpe:/o:novell:opensuse:42.3

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2018/05/11

Exploitable With

Metasploit (Microsoft Windows POP/MOV SS Local Privilege Elevation Vulnerability)

Reference Information

CVE: CVE-2017-5754, CVE-2018-10471, CVE-2018-10472, CVE-2018-7540, CVE-2018-7541, CVE-2018-7542, CVE-2018-8897

IAVA: 2018-A-0019

IAVB: 2018-B-0057