CVE-2024-1561 in gradio
Summary
by MITRE • 04/16/2024
An issue was discovered in gradio-app/gradio, where the `/component_server` endpoint improperly allows the invocation of any method on a `Component` class with attacker-controlled arguments. Specifically, by exploiting the `move_resource_to_block_cache()` method of the `Block` class, an attacker can copy any file on the filesystem to a temporary directory and subsequently retrieve it. This vulnerability enables unauthorized local file read access, posing a significant risk especially when the application is exposed to the internet via `launch(share=True)`, thereby allowing remote attackers to read files on the host machine. Furthermore, gradio apps hosted on `huggingface.co` are also affected, potentially leading to the exposure of sensitive information such as API keys and credentials stored in environment variables.
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Analysis
by VulDB Data Team • 07/30/2025
This vulnerability exists within the gradio web framework where the /component_server endpoint fails to properly validate method calls on Component classes, creating a critical path for unauthorized file access. The flaw specifically exploits the move_resource_to_block_cache() method within the Block class, which allows attackers to manipulate file copying operations to target arbitrary files on the host filesystem. The vulnerability stems from insufficient input validation and improper access controls that permit arbitrary method invocation with attacker-controlled parameters. This represents a classic case of insecure deserialization and method reflection abuse where the framework's internal component server does not adequately sanitize user-provided method names and arguments. The security implications extend beyond simple file reading to include potential credential exposure and system compromise when applications are deployed publicly.
The technical exploitation occurs through the manipulation of the component server endpoint which accepts method names and parameters from external requests without proper authorization checks. When an attacker crafts a malicious request to the /component_server endpoint, they can specify any method within the Component class hierarchy, including move_resource_to_block_cache() which operates with elevated privileges. This method is designed to handle resource management within the application's block caching system, but due to missing validation, it processes attacker-controlled file paths and operations. The vulnerability aligns with CWE-20: Improper Input Validation and CWE-73: External Control of File Name or Path, as the framework allows external input to directly influence file system operations. The implementation flaw permits attackers to traverse file system boundaries and copy sensitive files to temporary directories where they can be accessed through subsequent requests.
The operational impact of this vulnerability is severe and particularly dangerous when gradio applications are exposed to internet-facing environments. When applications are launched with share=True parameter, the vulnerability becomes remotely exploitable, allowing attackers to read arbitrary files on the host system without authentication. This includes sensitive information stored in environment variables, configuration files, and potentially API keys or credentials. The risk is compounded when gradio applications are hosted on huggingface.co platforms, where the vulnerability affects not just local deployments but also cloud-hosted applications. Attackers can leverage this to extract private keys, database credentials, application secrets, and other confidential data that may be accessible through the filesystem. This represents a significant threat to data confidentiality and system integrity, especially in environments where applications process sensitive information or have access to privileged resources. The vulnerability effectively provides a backdoor for unauthorized data exfiltration and can be used as a stepping stone for further exploitation.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and access control measures within the gradio framework. The immediate solution involves adding strict method name validation to the component server endpoint, ensuring that only authorized methods can be invoked through the API. Implementing proper authentication and authorization checks for all component server operations will prevent unauthorized access to system resources. The framework should enforce a whitelist of allowed methods and parameters, rejecting any requests containing potentially dangerous method names or file paths. Additionally, privilege separation should be implemented to ensure that file system operations occur with minimal required permissions. Organizations should also consider implementing network segmentation and access controls to limit exposure of gradio applications to untrusted networks. Regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other framework components. This vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege, where all external inputs are properly validated and all system operations are appropriately authorized. The remediation efforts should align with ATT&CK technique T1078: Valid Accounts and T1566: Phishing to prevent unauthorized access and data exfiltration through compromised applications.