Deserialization of Untrusted Data Affecting rasa package, versions [,3.6.21)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published21 Jan 2025
- disclosed14 Jan 2025
- creditJulian Scheid from Deutsche Telekom Security GmbH
Introduced: 14 Jan 2025
NewCVE-2024-49375 (opens in a new tab)How to fix?
Upgrade rasa to version 3.6.21 or higher.
Overview
rasa is an Open source machine learning framework to automate text- and voice-based conversations: NLU, dialogue management, connect to Slack, Facebook, and more - Create chatbots and voice assistants
Affected versions of this package are vulnerable to Deserialization of Untrusted Data by loading a maliciously crafted model into a Rasa instance.
Note: After upgrading to the fixed version, users must retrain their models using the fixed version of Rasa Pro or Open Source.
This is only exploitable if:
HTTP API Enabled: The Rasa instance has the HTTP API enabled (e.g., using
--enable-api). This is not the default configuration.Unauthenticated RCE: The user has not implemented authentication or other recommended security controls as outlined in Rasa's documentation.
Authenticated RCE: The attacker possesses a valid authentication token or JWT to interact with the Rasa API.
Workaround
Users who are unable to upgrade to the fixed version should:
For unauthenticated RCE mitigation - Enable authentication for the Rasa HTTP API if it is enabled.
For authenticated RCE mitigation - Load models only from trusted sources, such as internal CI pipelines, verify file hashes of model archives to ensure they have not been tampered with and, implement strict access controls and follow the principle of least privilege to limit API access, even for authenticated users.
Details
Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.
Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.