CVE-2014-9568 in rabbitmq
Summary
by MITRE
puppetlabs-rabbitmq 3.0 through 4.1 stores the RabbitMQ Erlang cookie value in the facts of a node, which allows local users to obtain sensitive information as demonstrated by using Facter.
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Analysis
by VulDB Data Team • 04/08/2018
The vulnerability identified as CVE-2014-9568 resides within the puppetlabs-rabbitmq module version 3.0 through 4.1, where the RabbitMQ Erlang cookie value is inadvertently stored in the node facts. This represents a significant information disclosure flaw that directly violates fundamental security principles of credential handling and privilege separation. The Erlang cookie serves as the primary authentication mechanism for RabbitMQ clusters, enabling nodes to communicate securely and maintain cluster integrity. When this critical credential is exposed in node facts, it creates an immediate and severe security risk for any system utilizing this module.
The technical implementation of this vulnerability stems from the puppetlabs-rabbitmq module's design decision to persist the Erlang cookie value within the node's fact collection system. Facter, the tool used by Puppet to collect system information, aggregates various system attributes including the cookie value, which is then made accessible to any local user with read access to the facts directory. This design flaw essentially transforms a security-critical credential into a readily accessible plaintext value within the system's metadata storage. The vulnerability operates at the intersection of configuration management and authentication mechanisms, where the Puppet infrastructure's fact collection process inadvertently exposes sensitive cluster credentials.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides local attackers with the capability to compromise entire RabbitMQ clusters. An attacker who gains local access to a system can retrieve the Erlang cookie from the facts and use it to authenticate as a cluster member, potentially gaining unauthorized access to message queues, consuming or modifying messages, and even performing administrative operations on the cluster. This vulnerability directly maps to CWE-200, which addresses improper exposure of sensitive information, and represents a classic case of privilege escalation through credential exposure. The attack surface is particularly concerning in environments where Puppet is used for configuration management, as the vulnerability affects systems that may be running critical messaging infrastructure.
The security implications of this vulnerability align with ATT&CK technique T1003.001, which involves OS credential dumping, although in this case the credential exposure occurs through the facts system rather than traditional credential harvesting methods. Organizations utilizing puppetlabs-rabbitmq within their infrastructure face significant risk, as the exposure of the Erlang cookie effectively provides attackers with a backdoor into their message broker clusters. The vulnerability's impact is amplified by the fact that RabbitMQ clusters often handle sensitive data flows, including financial transactions, user authentication tokens, and system notifications, making the exposure of cluster credentials particularly damaging.
Mitigation strategies for this vulnerability require immediate action to address the root cause within the puppetlabs-rabbitmq module. The most effective approach involves upgrading to versions of the module that properly handle the Erlang cookie value without storing it in node facts, which typically requires moving to versions beyond 4.1. System administrators should also implement access controls to limit local user privileges and restrict access to the facts directory where the cookie value is stored. Additionally, organizations should conduct thorough audits of their Puppet configurations to identify any other instances where sensitive credentials might be exposed through fact collection mechanisms. The remediation process must also include monitoring for any potential exploitation attempts that might have occurred prior to the implementation of proper mitigations, as the exposure of the Erlang cookie could have enabled unauthorized cluster access.