[USN-3680-1] libvirt vulnerability and update


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From: Marc Deslauriers
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Subject: [USN-3680-1] libvirt vulnerability and update

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

libvirt vulnerability and update
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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 updat=
es
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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