============================================================== RCE vulnerability in Openstack Murano using insecure YAML tags ==============================================================

:Date: June 23, 2016 :CVE: CVE-2016-4972

Affects ~~~~~~~ - Murano: <=2015.1.1; <=1.0.2; ==2.0.0 - Murano-dashboard: <=2015.1.1; <=1.0.2; ==2.0.0 - Python-muranoclient: <=0.7.2; >=0.8.0<=0.8.4

Description ~~~~~~~~~~~ Kirill Zaitsev from Mirantis reported a vulnerability in OpenStack Murano applications processing. Using extended YAML tags in Murano application YAML files, an attacker can perform a Remote Code Execution attack.

Vulnerability has been verified in all currently supported branches. Further examination of code suggest, that it is also present in kilo and juno versions of murano.

Patches ~~~~~~~ - https://review.openstack.org/#/c/333444/ (Liberty) - https://review.openstack.org/#/c/333425/ (Liberty) - https://review.openstack.org/#/c/333432/ (Liberty) - https://review.openstack.org/#/c/333443/ (Mitaka) - https://review.openstack.org/#/c/333424/ (Mitaka) - https://review.openstack.org/#/c/333439/ (Mitaka) - https://review.openstack.org/#/c/333423/ (Newton) - https://review.openstack.org/#/c/333440/ (Newton) - https://review.openstack.org/#/c/333428/ (Newton)

Credits ~~~~~~~ - Kirill Zaitsev from Mirantis (CVE-2016-4972)

References ~~~~~~~~~~ - https://bugs.launchpad.net/python-muranoclient/+bug/1586078 - https://bugs.launchpad.net/murano/+bug/1586079 - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4972

Notes ~~~~~ - Fixes for this bug are going to be included in the upcoming releases of murano 1.0.3(liberty), 2.0.1(mitaka), 3.0.0(newton) and python-muranoclient 0.7.3(liberty), 0.8.5(mitaka), 0.9.0(newton)

-- Kirill Zaitsev Murano Project Technical Lead