ESB-2019.1158 - [SUSE] xen: Multiple vulnerabilities 2019-04-05

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.1158
             SUSE Security Update: Recommended update for xen
                               5 April 2019

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           xen
Publisher:         SUSE
Operating System:  SUSE
Impact/Access:     Increased Privileges   -- Existing Account
                   Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19967  

Reference:         ESB-2019.1098.3

Original Bulletin: 
   https://www.suse.com/support/update/announcement/2019/suse-su-20190875-1/

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   SUSE Security Update: Recommended update for xen
______________________________________________________________________________

Announcement ID:    SUSE-SU-2019:0875-1
Rating:             important
References:         #1026236 #1027519 #1114988 #1126140 #1126141 
                    #1126192 #1126195 #1126196 #1126197 #1126198 
                    #1126201 #1126325 #1127400 #1127620 
Cross-References:   CVE-2018-19967
Affected Products:
                    SUSE Linux Enterprise Module for Server Applications 15
                    SUSE Linux Enterprise Module for Basesystem 15
______________________________________________________________________________

   An update that solves one vulnerability and has 13 fixes is
   now available.

Description:

   This update for xen fixes the following issues:

   Security issues fixed:

   - CVE-2018-19967: Fixed HLE constructs that allowed guests to lock up the
     host, resulting in a Denial of Service (DoS). (XSA-282) (bsc#1114988)
   - Fixed an issue which could allow malicious PV guests may cause a host
     crash or gain access to data pertaining to other guests.Additionally,
     vulnerable configurations are likely to be unstable even in the absence
     of an attack (bsc#1126198).
   - Fixed multiple access violations introduced by XENMEM_exchange hypercall
     which could allow a single PV guest to leak arbitrary amounts of memory,
     leading to a denial of service (bsc#1126192).
   - Fixed an issue which could allow a malicious unprivileged guest
     userspace process to escalate its privilege to that of other userspace
     processes in the same guest and potentially thereby to that
     of the guest operating system (bsc#1126201).
   - Fixed an issue which could allow malicious or buggy x86 PV guest kernels
     to mount a Denial of Service attack affecting the whole system
     (bsc#1126197).
   - Fixed an issue which could allow an untrusted PV domain with access to a
     physical device to DMA into its own pagetables leading to privilege
     escalation (bsc#1126195).
   - Fixed an issue which could allow a malicious or buggy x86 PV guest
     kernels can mount a Denial of Service attack affecting the whole system
     (bsc#1126196).
   - Fixed an issue which could allow malicious 64bit PV guests to cause a
     host crash (bsc#1127400).
   - Fixed an issue which could allow malicious or buggy guests with passed
     through PCI devices to  be able to escalate their privileges, crash the
     host, or access data belonging to other guests. Additionally memory
     leaks were also possible (bsc#1126140).
   - Fixed a race condition issue which could allow malicious PV guests to
     escalate their privilege to that
     of the hypervisor (bsc#1126141).

   Other issues fixed:

   - Upstream bug fixes (bsc#1027519)
   - Fixed an issue where setup of grant_tables and other variables may fail
     (bsc#1126325).
   - Added a requirement for xen, xl.cfg firmware="pvgrub32|pvgrub64
     (bsc#1127620).
   - Added Xen cmdline option "suse_vtsc_tolerance" to avoid TSC emulation
     for HVM domUs (bsc#1026236).


Patch Instructions:

   To install this SUSE 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:

   - SUSE Linux Enterprise Module for Server Applications 15:

      zypper in -t patch SUSE-SLE-Module-Server-Applications-15-2019-875=1

   - SUSE Linux Enterprise Module for Basesystem 15:

      zypper in -t patch SUSE-SLE-Module-Basesystem-15-2019-875=1



Package List:

   - SUSE Linux Enterprise Module for Server Applications 15 (x86_64):

      xen-4.10.3_02-3.14.1
      xen-debugsource-4.10.3_02-3.14.1
      xen-devel-4.10.3_02-3.14.1
      xen-tools-4.10.3_02-3.14.1
      xen-tools-debuginfo-4.10.3_02-3.14.1

   - SUSE Linux Enterprise Module for Basesystem 15 (x86_64):

      xen-debugsource-4.10.3_02-3.14.1
      xen-libs-4.10.3_02-3.14.1
      xen-libs-debuginfo-4.10.3_02-3.14.1
      xen-tools-domU-4.10.3_02-3.14.1
      xen-tools-domU-debuginfo-4.10.3_02-3.14.1


References:

   https://www.suse.com/security/cve/CVE-2018-19967.html
   https://bugzilla.suse.com/1026236
   https://bugzilla.suse.com/1027519
   https://bugzilla.suse.com/1114988
   https://bugzilla.suse.com/1126140
   https://bugzilla.suse.com/1126141
   https://bugzilla.suse.com/1126192
   https://bugzilla.suse.com/1126195
   https://bugzilla.suse.com/1126196
   https://bugzilla.suse.com/1126197
   https://bugzilla.suse.com/1126198
   https://bugzilla.suse.com/1126201
   https://bugzilla.suse.com/1126325
   https://bugzilla.suse.com/1127400
   https://bugzilla.suse.com/1127620

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