CVE-2014-3429 in Notebook
Summary
by MITRE
IPython Notebook 0.12 through 1.x before 1.2 does not validate the origin of websocket requests, which allows remote attackers to execute arbitrary code by leveraging knowledge of the kernel id and a crafted page.
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Analysis
by VulDB Data Team • 12/17/2024
The vulnerability described in CVE-2014-3429 represents a critical security flaw in IPython Notebook versions ranging from 0.12 through 1.x before 1.2. This issue stems from insufficient validation of websocket request origins within the notebook's kernel communication system. The vulnerability operates at the intersection of web application security and kernel-level execution, creating a pathway for remote code execution through a sophisticated attack vector that leverages knowledge of kernel identifiers.
The technical flaw manifests in the websocket communication layer where IPython Notebook fails to properly authenticate or validate the source of websocket requests. When a user accesses a notebook kernel, the system generates a unique kernel identifier that serves as a session token for communication. However, the vulnerability allows attackers to craft malicious web pages that can establish websocket connections to kernel endpoints without proper authentication. This occurs because the system does not verify that websocket requests originate from legitimate notebook interfaces, enabling unauthorized access to kernel execution capabilities. The absence of origin validation creates a trust boundary violation that directly enables arbitrary code execution.
From an operational impact perspective, this vulnerability poses significant risks to organizations using IPython Notebook for data analysis and scientific computing. Attackers can exploit this flaw to execute arbitrary commands on systems running vulnerable notebook instances, potentially gaining complete control over computational resources. The vulnerability is particularly dangerous in multi-user environments where notebook servers might be accessible over networks or the internet. The attack requires only knowledge of a kernel identifier, which can be obtained through various reconnaissance techniques, making the exploitation relatively straightforward for determined attackers. This vulnerability directly maps to CWE-284, which addresses improper access control, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter.
Mitigation strategies for CVE-2014-3429 involve both immediate patching and architectural improvements. The most effective immediate solution is upgrading to IPython Notebook version 1.2 or later, where the websocket origin validation has been implemented. Organizations should also implement network-level controls such as firewall rules to restrict access to notebook servers, particularly when running in production environments. Additional security measures include enabling proper authentication mechanisms, implementing secure communication protocols like HTTPS, and regularly monitoring for unauthorized websocket connections. The vulnerability demonstrates the importance of proper input validation and authentication in web applications, particularly those that provide kernel-level access to computational resources. Security teams should also consider implementing network segmentation and access controls to limit exposure of notebook servers to untrusted networks, ensuring that only authorized users can establish connections to kernel endpoints.