ESB-2018.1550 - [Ubuntu] qemu: Access privileged data - Existing account 2018-05-22

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

                               ESB-2018.1550
                                QEMU update
                                22 May 2018

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

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

Product:           qemu
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3639  

Reference:         ASB-2018.0121
                   ESB-2018.1548
                   ESB-2018.1545
                   ESB-2018.1549

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3651-1

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USN-3651-1: QEMU update

21 May 2018

qemu update

A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 18.04 LTS
  o Ubuntu 17.10
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

Side channel execution mitigations were added to QEMU.

Software Description

  o qemu - Machine emulator and virtualizer

Details

Ken Johnson and Jann Horn independently discovered that microprocessors
utilizing speculative execution of a memory read may allow unauthorized memory
reads via sidechannel attacks. An attacker in the guest could use this to
expose sensitive guest information, including kernel memory. This update allows
QEMU to expose new CPU features added by microcode updates to guests on amd64
and i386.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 18.04 LTS
    qemu - 1:2.11+dfsg-1ubuntu7.2
    qemu-system - 1:2.11+dfsg-1ubuntu7.2
    qemu-system-x86 - 1:2.11+dfsg-1ubuntu7.2
Ubuntu 17.10
    qemu - 1:2.10+dfsg-0ubuntu3.7
    qemu-system - 1:2.10+dfsg-0ubuntu3.7
    qemu-system-x86 - 1:2.10+dfsg-0ubuntu3.7
Ubuntu 16.04 LTS
    qemu - 1:2.5+dfsg-5ubuntu10.29
    qemu-system - 1:2.5+dfsg-5ubuntu10.29
    qemu-system-x86 - 1:2.5+dfsg-5ubuntu10.29
Ubuntu 14.04 LTS
    qemu - 2.0.0+dfsg-2ubuntu1.42
    qemu-system - 2.0.0+dfsg-2ubuntu1.42
    qemu-system-x86 - 2.0.0+dfsg-2ubuntu1.42

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart all QEMU virtual machines to
make all the necessary changes.

References

  o CVE-2018-3639
  o https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/Variant4

(C) 2017 Canonical Ltd. Ubuntu and Canonical are registered trademarks of
Canonical Ltd.

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