USN-3576-1: libvirt vulnerabilities
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
Source: USN-3576-1: libvirt vulnerabilities
