ESB-2018.1747 - [Ubuntu] libvirt: Multiple vulnerabilities 2018-06-13

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1747
                     libvirt vulnerability and update
                               13 June 2018

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

Product:           libvirt
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data -- Existing Account
                   Denial of Service      -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-3639 CVE-2018-1064 

Reference:         ASB-2018.0121
                   ESB-2018.1613
                   ESB-2018.0756
                   ESB-2018.0754

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3680-1

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Ubuntu Security Notice USN-3680-1
June 12, 2018

libvirt vulnerability and update
==========================================================================

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

- - Ubuntu 18.04 LTS
- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS

Summary:

Side channel execution mitigations were added to libvirt.

Software Description:
- - libvirt: Libvirt virtualization toolkit

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 libvirt to expose new CPU features added by microcode updates
to guests. (CVE-2018-3639)

Daniel P. Berrange discovered that libvirt incorrectly handled the QEMU
guest agent. An attacker could possibly use this issue to consume
resources, leading to a denial of service. (CVE-2018-1064)

Update instructions:

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

Ubuntu 18.04 LTS:
  libvirt-bin                     4.0.0-1ubuntu8.2
  libvirt0                        4.0.0-1ubuntu8.2

Ubuntu 17.10:
  libvirt-bin                     3.6.0-1ubuntu6.8
  libvirt0                        3.6.0-1ubuntu6.8

Ubuntu 16.04 LTS:
  libvirt-bin                     1.3.1-1ubuntu10.24
  libvirt0                        1.3.1-1ubuntu10.24

Ubuntu 14.04 LTS:
  libvirt-bin                     1.2.2-0ubuntu13.1.27
  libvirt0                        1.2.2-0ubuntu13.1.27

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://usn.ubuntu.com/usn/usn-3680-1
  CVE-2018-1064, CVE-2018-3639

Package Information:
  https://launchpad.net/ubuntu/+source/libvirt/4.0.0-1ubuntu8.2
  https://launchpad.net/ubuntu/+source/libvirt/3.6.0-1ubuntu6.8
  https://launchpad.net/ubuntu/+source/libvirt/1.3.1-1ubuntu10.24
  https://launchpad.net/ubuntu/+source/libvirt/1.2.2-0ubuntu13.1.27

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