==========================================================================
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

—–BEGIN PGP SIGNATURE—–

iQIcBAEBCgAGBQJajJBWAAoJEGVp2FWnRL6TEzMP/0vXoeOp45jyNImEHGTCCn6r
qHUoNsnfVnSJQS7AUChgXGycVQPl5bktZDAudcIqpqLcGT0hFLGS4hbbA4VPDnzR
w4pSKoz5g7CbZciMlNIsQPhcOmy061G5jTb3E8cwHRQJTKoXA0XQxTlAOZFLuJ8Z
FZkOg26uf7uLRLsqCC8n6tI9YQiwd9s1KikGvH5iVMsrOwvZknsWYmCjOVs/cT87
lkf6t9HOgBEEgKNtH+sx/iENMZL0uHF3ofEi6oZSByOxBhCJqP1OIBtmkTh5u2IM
zUW4h21JDGCnRQpOWa5ztG9VUmqwImjtCDr3FLdhKd7xgsWcWAgsVtVjWUHBHTGK
9zn1GZ/Dp2xm9kSfP32D6jZf5cZk2QbOs/iLAm1gOHmk1Yab60soxWYxivmVMPx8
hBdol+/uO/YpFJxMFQwQtN/WH+d5eRR9F0ttGslHIYqR7k50PAJdwNQZicjmYs9i
PQmq5fPBWSvw1TBXn7pj3hw6Dw0d8ZDA1K6yUchR/uE/6zxoft0uxLuFkmxodAsr
LN2eH5Bk9zRDww6AZpU1ncWVUHZQx9xK7LCZFWVb2c2HjaBWYDcMUUvXro4Mjzqw
Or7gb0fKIkvr7mBt85l/eAlOBVzGQ8Qgi8MQAdBZBUFD6qT7Qkn2Y7ze4BnwxNNu
s+EIyWAnJZ91MAgMhrfo
=oBDH
—–END PGP SIGNATURE—–
—