CVE-2018-1317 in Zeppelin
Summary
by MITRE
In Apache Zeppelin prior to 0.8.0 the cron scheduler was enabled by default and could allow users to run paragraphs as other users without authentication.
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Analysis
by VulDB Data Team • 09/06/2023
Apache Zeppelin version 0.8.0 and earlier contained a critical security flaw in its cron scheduler implementation that fundamentally compromised user authentication and privilege separation mechanisms. This vulnerability resided in the default configuration where the cron scheduler was enabled without proper authentication checks, creating a privilege escalation vector that allowed authenticated users to execute arbitrary code or paragraphs as different user accounts. The flaw directly violates the principle of least privilege and authentication requirements that are fundamental to secure multi-user environments. The vulnerability stems from improper access control validation within the scheduling subsystem, where the system failed to verify that the user requesting a scheduled execution had the appropriate permissions to impersonate other users. This design flaw enabled malicious actors to craft specially formatted cron jobs that would execute with elevated privileges, potentially allowing them to access data belonging to other users or perform administrative functions. The issue is categorized under CWE-284 Access Control Bypass, which specifically addresses scenarios where systems fail to properly enforce access controls. From an operational perspective, this vulnerability could enable attackers to perform unauthorized data access, information disclosure, and privilege escalation attacks within Zeppelin environments. The impact extends beyond simple user impersonation to potential full system compromise, especially in environments where Zeppelin is used for data analytics and reporting. Attackers could leverage this vulnerability to execute arbitrary code as different users, potentially accessing sensitive datasets, modifying existing notebooks, or creating new scheduled jobs that persist across system restarts. The ATT&CK framework categorizes this as privilege escalation through scheduled task manipulation, where adversaries exploit system scheduling mechanisms to gain elevated privileges. The vulnerability is particularly dangerous because it operates at the system configuration level rather than requiring exploitation of application-level flaws, making it more persistent and harder to detect. Organizations using Apache Zeppelin in production environments were at significant risk, as the default configuration provided an open door for unauthorized access. The fix implemented in version 0.8.0 involved disabling the cron scheduler by default and implementing proper authentication checks for scheduled job execution. Security professionals should validate that the cron scheduler is disabled unless explicitly required and that appropriate access controls are enforced for any scheduled operations. The vulnerability highlights the importance of secure default configurations and proper authentication mechanisms in multi-user data analytics platforms. Organizations should conduct thorough security assessments of their Zeppelin installations, particularly focusing on scheduled job configurations and user privilege management. Regular monitoring of scheduled tasks and access logs should be implemented to detect any unauthorized execution attempts. The incident underscores the critical need for comprehensive security testing of default configurations and the importance of following security best practices for system hardening. Proper network segmentation and access controls should be implemented to limit exposure of Zeppelin instances to unauthorized users. The vulnerability also demonstrates the risks associated with overly permissive default settings in enterprise software and emphasizes the importance of security by design principles in modern data analytics platforms.