ESB-2018.0630 - [Linux][Debian] xen: Multiple vulnerabilities 2018-03-05

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0630
                            xen security update
                               5 March 2018

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

Product:           xen
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
                   Linux variants
Impact/Access:     Increased Privileges -- Existing Account
                   Denial of Service    -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7542 CVE-2018-7541 CVE-2018-7540

Original Bulletin: 
   http://www.debian.org/security/2018/dsa-4131

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running xen check for an updated version of the software for their 
         operating system.

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Debian Security Advisory DSA-4131-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
March 04, 2018                        https://www.debian.org/security/faq
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Package        : xen
CVE ID         : CVE-2018-7540 CVE-2018-7541 CVE-2018-7542

Multiple vulnerabilities have been discovered in the Xen hypervisor:

CVE-2018-7540

    Jann Horn discovered that missing checks in page table freeing may
    result in denial of service.

CVE-2018-7541

    Jan Beulich discovered that incorrect error handling in grant table
    checks may result in guest-to-host denial of service and potentially
    privilege escalation.

CVE-2018-7542

    Ian Jackson discovered that insufficient handling of x86 PVH guests
    without local APICs may result in guest-to-host denial of service.

For the stable distribution (stretch), these problems have been fixed in
version 4.8.3+comet2+shim4.10.0+comet3-1+deb9u5.

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/

Mailing list: debian-security-announce@lists.debian.org
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