CVE-2016-4972
Description
A flaw was discovered in openstack-murano processing. Using extended YAML tags in Murano-application YAML files, an attacker could perform remote code execution.
Statement
Red Hat OpenStack Platform and Red Hat Enterprise Linux OpenStack Platform do not include or support openstack-murano, and are therefore not affected by this flaw in any supported configuration.
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data; Unexpected State
Attackers can modify unexpected objects or data that was assumed to be safe from modification. Deserialized data or code could be modified without using the provided accessor functions, or unexpected functions could be invoked.
Availability
Technical Impact: DoS: Resource Consumption (CPU)
If a function is making an assumption on when to terminate, based on a sentry in a string, it could easily never terminate.
Other
Technical Impact: Varies by Context
The consequences can vary widely, because it depends on which objects or methods are being deserialized, and how they are used. Making an assumption that the code in the deserialized object is valid is dangerous and can enable exploitation. One example is attackers using gadget chains to perform unauthorized actions, such as generating a shell.
Acknowledgements
Red Hat would like to thank Kirill Zaitsev (Mirantis) for reporting this issue.
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