OpenStack Murano before 1.0.3 (liberty) and 2.x before 2.0.1 (mitaka), Murano-dashboard before 1.0.3 (liberty) and 2.x before 2.0.1 (mitaka), and python-muranoclient before 0.7.3 (liberty) and 0.8.x before 0.8.5 (mitaka) improperly use loaders inherited from yaml.Loader when parsing MuranoPL and UI files, which allows remote attackers to create arbitrary Python objects and execute arbitrary code via crafted extended YAML tags in UI definitions in packages.

The Sangfor Security Research Team has identified a critical security vulnerability in the Murano component of OpenStack. This vulnerability allows ordinary users capable of importing and deploying app packages to access sensitive information within OpenStack services. Specifically, through this exploit, unauthorised users can obtain Murano service account credentials, potentially escalating their privileges to an administrator level. Subsequently, unauthorised users can gain complete control over various resources, including user roles, hosts, and networks.

The exploit allows access to Murano service's oslo configuration storage, thereby exposing critical Murano service account credentials, granting unauthorised users administrative privileges.

In OpenStack Murano through 16.0.0, when YAQL before 3.0.0 is used, the Murano service's MuranoPL extension to the YAQL language fails to sanitize the supplied environment, leading to potential leakage of sensitive service account information.