Operating System:

[Debian]

Published:

15 January 2019

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0129
                            xen security update
                              15 January 2019

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

Product:           xen
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19967 CVE-2018-19966 CVE-2018-19965
                   CVE-2018-19962 CVE-2018-19961 CVE-2017-15595

Reference:         ESB-2019.0045
                   ESB-2019.0030
                   ESB-2018.3624.2

Original Bulletin: 
   http://www.debian.org/security/2019/dsa-4369

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Debian Security Advisory DSA-4369-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
January 14, 2019                      https://www.debian.org/security/faq
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Package        : xen
CVE ID         : CVE-2018-19961 CVE-2018-19962 CVE-2018-19965
                 CVE-2018-19966 CVE-2018-19967

Multiple vulnerabilities have been discovered in the Xen hypervisor:

CVE-2018-19961 / CVE-2018-19962

    Paul Durrant discovered that incorrect TLB handling could result in
    denial of service, privilege escalation or information leaks.

CVE-2018-19965

    Matthew Daley discovered that incorrect handling of the INVPCID
    instruction could result in denial of service by PV guests.

CVE-2018-19966

    It was discovered that a regression in the fix to address
    CVE-2017-15595 could result in denial of service, privilege
    escalation or information leaks by a PV guest.

CVE-2018-19967

    It was discovered that an error in some Intel CPUs could result in
    denial of service by a guest instance.
    
For the stable distribution (stretch), these problems have been fixed in
version 4.8.5+shim4.10.2+xsa282-1+deb9u11.

We recommend that you upgrade your xen packages.

For the detailed security status of xen please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/xen

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

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