CVE-2018-1317

Vulnerability

Overview

The vulnerability, identified as CVE-2018-1317, affects Apache Zeppelin versions prior to 0.8.0. The cron scheduler feature was enabled by default and did not require authentication, allowing users to schedule and execute paragraphs as other users. This design flaw allowed an attacker to impersonate arbitrary users without valid credentials, leading to unauthorized actions within the Zeppelin notebook environment [1][2].

Exploitation

An attacker with access to the Zeppelin web interface could create or modify cron jobs to execute paragraphs under the identity of another user. No prior authentication is needed; the attacker only needs network access to the Zeppelin server. The cron scheduler's default-enabled state increased the attack surface, as users could exploit this without any additional configuration changes [2].

Impact

Successful exploitation enables an attacker to run arbitrary code or queries as a different user, potentially gaining access to sensitive data, modifying notebooks, or performing administrative actions. This could lead to data leakage, privilege escalation, or disruption of services within the Zeppelin environment [1][2].

Mitigation

The issue was fixed in Apache Zeppelin version 0.8.0, released in July 2018, where the cron scheduler was disabled by default and required proper authentication. Users are advised to upgrade to at least version 0.8.0 to protect against this vulnerability. No workarounds were provided for earlier versions [3].