ESB-2018.0692 - [SUSE] xen: Multiple vulnerabilities 2018-03-09

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             AUSCERT External Security Bulletin Redistribution

               SUSE Security Update: Security update for xen
                               9 March 2018


        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-2018-5683 CVE-2017-18030 CVE-2017-17566
                   CVE-2017-17565 CVE-2017-17564 CVE-2017-17563
                   CVE-2017-15595 CVE-2017-5754 CVE-2017-5753

Reference:         ASB-2018.0033

Original Bulletin:

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   SUSE Security Update: Security update for xen

Announcement ID:    SUSE-SU-2018:0638-1
Rating:             important
References:         #1027519 #1031382 #1035442 #1061081 #1068032 
                    #1070158 #1070159 #1070160 #1070163 #1074562 
                    #1076116 #1076180 #1080635 #1080662 
Cross-References:   CVE-2017-15595 CVE-2017-17563 CVE-2017-17564
                    CVE-2017-17565 CVE-2017-17566 CVE-2017-18030
                    CVE-2017-5715 CVE-2017-5753 CVE-2017-5754
Affected Products:
                    SUSE Linux Enterprise Software Development Kit 11-SP4
                    SUSE Linux Enterprise Server 11-SP4
                    SUSE Linux Enterprise Debuginfo 11-SP4

   An update that solves 10 vulnerabilities and has four fixes
   is now available.


   This update for xen fixes several issues.

   This new feature was included:

   - add script and sysv service to watch for vcpu online/offline events in a
     HVM domU

   These security issues were fixed:

   - CVE-2017-5753, CVE-2017-5715, CVE-2017-5754: Prevent information leaks
     via side effects of speculative execution, aka "Spectre" and "Meltdown"
     attacks (bsc#1074562, bsc#1068032)
   - CVE-2018-5683: The vga_draw_text function allowed local OS guest
     privileged users to cause a denial of service (out-of-bounds read and
     QEMU process crash) by leveraging improper memory address validation
   - CVE-2017-18030: The cirrus_invalidate_region function allowed local OS
     guest privileged users to cause a denial of service (out-of-bounds array
     access and QEMU process crash) via vectors related to negative pitch
   - CVE-2017-15595: x86 PV guest OS users were able to cause a DoS
     (unbounded recursion, stack consumption, and hypervisor crash) or
     possibly gain privileges via crafted page-table stacking (bsc#1061081)
   - CVE-2017-17566: Prevent PV guest OS users to cause a denial of service
     (host OS crash) or gain host OS privileges in shadow mode by mapping a
     certain auxiliary page (bsc#1070158).
   - CVE-2017-17563: Prevent guest OS users to cause a denial of service
     (host OS crash) or gain host OS privileges by leveraging an incorrect
     mask for reference-count overflow checking in shadow mode (bsc#1070159).
   - CVE-2017-17564: Prevent guest OS users to cause a denial of service
     (host OS crash) or gain host OS privileges by leveraging incorrect error
     handling for reference counting in shadow mode (bsc#1070160).
   - CVE-2017-17565: Prevent PV guest OS users to cause a denial of service
     (host OS crash) if shadow mode and log-dirty mode are in place, because
     of an incorrect assertion related to M2P (bsc#1070163).
   - Added missing intermediate preemption checks for guest requesting
     removal of memory. This allowed malicious guest administrator to cause
     denial of service due to the high cost of this operation (bsc#1080635).
   - Because of XEN not returning the proper error messages when
     transitioning grant tables from v2 to v1 a malicious guest was able to
     cause DoS or potentially allowed for privilege escalation as well as
     information leaks (bsc#1080662).

   These non-security issues were fixed:

   - bsc#1035442: Increased the value of LIBXL_DESTROY_TIMEOUT from 10 to 100
     seconds. If many domUs shutdown in parallel the backends couldn't keep up
   - bsc#1031382: Prevent VMs from crashing when migrating between dom0 hosts
     in case read() returns zero on the receiver side.

Patch Instructions:

   To install this SUSE Security Update use YaST online_update.
   Alternatively you can run the command listed for your product:

   - SUSE Linux Enterprise Software Development Kit 11-SP4:

      zypper in -t patch sdksp4-xen-13501=1

   - SUSE Linux Enterprise Server 11-SP4:

      zypper in -t patch slessp4-xen-13501=1

   - SUSE Linux Enterprise Debuginfo 11-SP4:

      zypper in -t patch dbgsp4-xen-13501=1

   To bring your system up-to-date, use "zypper patch".

Package List:

   - SUSE Linux Enterprise Software Development Kit 11-SP4 (i586 x86_64):


   - SUSE Linux Enterprise Server 11-SP4 (i586 x86_64):


   - SUSE Linux Enterprise Server 11-SP4 (x86_64):


   - SUSE Linux Enterprise Server 11-SP4 (i586):


   - SUSE Linux Enterprise Debuginfo 11-SP4 (i586 x86_64):



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