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Ubuntu Security Notice USN-3576-1

Ubuntu Security Notice USN-3576-1
Posted Feb 20, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3576-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2016-5008, CVE-2017-1000256, CVE-2018-5748, CVE-2018-6764
MD5 | 931859bd5d694e9c9b0cfb0c3d3fb153

Ubuntu Security Notice USN-3576-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3576-1
February 20, 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 versions:

Ubuntu 17.10:
libvirt-bin 3.6.0-1ubuntu6.3
libvirt0 3.6.0-1ubuntu6.3

Ubuntu 16.04 LTS:
libvirt-bin 1.3.1-1ubuntu10.19
libvirt0 1.3.1-1ubuntu10.19

Ubuntu 14.04 LTS:
libvirt-bin 1.2.2-0ubuntu13.1.26
libvirt0 1.2.2-0ubuntu13.1.26

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

References:
https://www.ubuntu.com/usn/usn-3576-1
CVE-2016-5008, CVE-2017-1000256, CVE-2018-5748, CVE-2018-6764

Package Information:
https://launchpad.net/ubuntu/+source/libvirt/3.6.0-1ubuntu6.3
https://launchpad.net/ubuntu/+source/libvirt/1.3.1-1ubuntu10.19
https://launchpad.net/ubuntu/+source/libvirt/1.2.2-0ubuntu13.1.26


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