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suseSuseSUSE-SU-2018:1184-1
HistoryMay 09, 2018 - 9:09 p.m.

Security update for xen (important)

2018-05-0921:09:32
lists.opensuse.org
51

0.975 High

EPSS

Percentile

100.0%

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

0.975 High

EPSS

Percentile

100.0%