openSUSE Security Update: Security update for xen
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Announcement ID: openSUSE-SU-2018:1274-1
Rating: important
References: #1027519 #1072834 #1080634 #1080635 #1080662
#1087251 #1087252 #1089152 #1089635 #1090820
#1090822 #1090823
Cross-References: CVE-2018-10471 CVE-2018-10472 CVE-2018-7540
CVE-2018-7541 CVE-2018-7542 CVE-2018-8897

Affected Products:
openSUSE Leap 42.3
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An update that solves 6 vulnerabilities and has 6 fixes is
now available.

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.

Patch Instructions:

To install this openSUSE Security Update use the SUSE recommended installation methods
like YaST online_update or “zypper patch”.

Alternatively you can run the command listed for your product:

– openSUSE Leap 42.3:

zypper in -t patch openSUSE-2018-454=1

Package List:

– openSUSE Leap 42.3 (x86_64):

xen-4.9.2_04-19.2
xen-debugsource-4.9.2_04-19.2
xen-devel-4.9.2_04-19.2
xen-doc-html-4.9.2_04-19.2
xen-libs-4.9.2_04-19.2
xen-libs-debuginfo-4.9.2_04-19.2
xen-tools-4.9.2_04-19.2
xen-tools-debuginfo-4.9.2_04-19.2
xen-tools-domU-4.9.2_04-19.2
xen-tools-domU-debuginfo-4.9.2_04-19.2

References:

https://www.suse.com/security/cve/CVE-2018-10471.html
https://www.suse.com/security/cve/CVE-2018-10472.html
https://www.suse.com/security/cve/CVE-2018-7540.html
https://www.suse.com/security/cve/CVE-2018-7541.html
https://www.suse.com/security/cve/CVE-2018-7542.html
https://www.suse.com/security/cve/CVE-2018-8897.html
https://bugzilla.suse.com/1027519
https://bugzilla.suse.com/1072834
https://bugzilla.suse.com/1080634
https://bugzilla.suse.com/1080635
https://bugzilla.suse.com/1080662
https://bugzilla.suse.com/1087251
https://bugzilla.suse.com/1087252
https://bugzilla.suse.com/1089152
https://bugzilla.suse.com/1089635
https://bugzilla.suse.com/1090820
https://bugzilla.suse.com/1090822
https://bugzilla.suse.com/1090823

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