ESB-2018.0509 - [Ubuntu] libvirt-bin: Multiple vulnerabilities 2018-02-21

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0509
                          libvirt vulnerabilities
                             21 February 2018

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

Product:           libvirt-bin
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account      
                   Denial of Service               -- Existing Account      
                   Unauthorised Access             -- Remote/Unauthenticated
                   Reduced Security                -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-6764 CVE-2018-5748 CVE-2017-1000256
                   CVE-2016-5008  

Reference:         ESB-2016.2595
                   ESB-2016.1650

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3576-1

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Ubuntu Security Notice USN-3576-1

20th February, 2018
libvirt vulnerabilities

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

    Ubuntu 17.10
    Ubuntu 16.04 LTS
    Ubuntu 14.04 LTS

Summary

Several security issues were fixed in libvirt.
Software description

    libvirt - Libvirt virtualization toolkit

Details

Vivian Zhang and Christoph Anton Mitterer discovered that libvirt
incorrectly disabled password authentication when the VNC password was set
to an empty string. A remote attacker could possibly use this issue to
bypass authentication, contrary to expectations. This issue only affected
Ubuntu 14.04 LTS and Ubuntu 16.04 LTS. (CVE-2016-5008)

Daniel P. Berrange discovered that libvirt incorrectly handled validating
SSL/TLS certificates. A remote attacker could possibly use this issue to
obtain sensitive information. This issue only affected Ubuntu 17.10.
(CVE-2017-1000256)

Daniel P. Berrange and Peter Krempa discovered that libvirt incorrectly
handled large QEMU replies. An attacker could possibly use this issue to
cause libvirt to crash, resulting in a denial of service. (CVE-2018-5748)

Pedro Sampaio discovered that libvirt incorrectly handled the libnss_dns.so
module. An attacker in a libvirt_lxc session could possibly use this issue
to execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and
Ubuntu 17.10. (CVE-2018-6764)
Update instructions

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

Ubuntu 17.10:
    libvirt0 3.6.0-1ubuntu6.3 
    libvirt-bin 3.6.0-1ubuntu6.3 
Ubuntu 16.04 LTS:
    libvirt0 1.3.1-1ubuntu10.19 
    libvirt-bin 1.3.1-1ubuntu10.19 
Ubuntu 14.04 LTS:
    libvirt0 1.2.2-0ubuntu13.1.26 
    libvirt-bin 1.2.2-0ubuntu13.1.26 

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

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

CVE-2016-5008, CVE-2017-1000256, CVE-2018-5748, CVE-2018-6764

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