ESB-2019.0838 - [Linux][Ubuntu] libvirt-clients: Denial of service - Existing account 2019-03-15

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0838
                           libvirt vulnerability
                               15 March 2019

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

Product:           libvirt-clients
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3840  

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3909-1

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

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Ubuntu Security Notice USN-3909-1
March 14, 2019

libvirt vulnerability

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

- - Ubuntu 18.10
- - Ubuntu 18.04 LTS
- - Ubuntu 16.04 LTS

Summary:

libvirt could be made to crash under certain conditions.

Software Description:
- - libvirt: Libvirt virtualization toolkit

Details:

It was discovered that libvirt incorrectly handled waiting for certain
agent events. An attacker inside a guest could possibly use this issue to 
cause libvirtd to stop responding, resulting in a denial of service.

Update instructions:

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

Ubuntu 18.10:
  libvirt-clients                 4.6.0-2ubuntu3.4
  libvirt-daemon                  4.6.0-2ubuntu3.4
  libvirt0                        4.6.0-2ubuntu3.4

Ubuntu 18.04 LTS:
  libvirt-clients                 4.0.0-1ubuntu8.8
  libvirt-daemon                  4.0.0-1ubuntu8.8
  libvirt0                        4.0.0-1ubuntu8.8

Ubuntu 16.04 LTS:
  libvirt-bin                     1.3.1-1ubuntu10.25
  libvirt0                        1.3.1-1ubuntu10.25

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

References:
  https://usn.ubuntu.com/usn/usn-3909-1
  CVE-2019-3840

Package Information:
  https://launchpad.net/ubuntu/+source/libvirt/4.6.0-2ubuntu3.4
  https://launchpad.net/ubuntu/+source/libvirt/4.0.0-1ubuntu8.8
  https://launchpad.net/ubuntu/+source/libvirt/1.3.1-1ubuntu10.25

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