openSUSE Security Update: Security update for xen
______________________________________________________________________________

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
______________________________________________________________________________

   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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