Cloudera Manager is designed to transmit certain diagnostic data (or “bundles”) to Cloudera. These diagnostic bundles are used by the Cloudera support team to reproduce, debug, and address technical issues for our customers. Cloudera internally discovered a potential vulnerability in this feature, which could cause any sensitive data stored as “advanced configuration snippets (ACS)” (formerly called “safety valves”) to be included in diagnostic bundles and transmitted to Cloudera. Notwithstanding any possible transmission, such sensitive data is not used by Cloudera for any purpose.

Cloudera has taken the following actions: (1) modified Cloudera Manager so that it no longer transmits advanced configuration snippets containing the sensitive data, and (2) modified Cloudera Manager SSL configuration to increase the protection level of the encrypted communication.

Cloudera strives to follow and also help establish best practices for the protection of customer information. In this effort, we continually review and improve our security practices, infrastructure, and data handling policies.

Severity: High

Impact: Possible transmission of sensitive data

CVE: CVE-2015-6495

This issue can occur when Cloudera Navigator auditing is turned on. The auditing code reads audit logs and sends them to the Audit Server. It acquires a lock to protect the list of roles being audited. The same list is also modified by the Cloudera Manager Agent's main thread when a role is started or stopped. If the Audit thread takes too much time to send audits to the Audit Server (which can happen if there is backlog of audit logs), it starves the main Agent thread. This causes the main Agent thread to not send heartbeats and to not respond to commands from the Cloudera Manager Server.

In Cloudera Manager 5, starting new ZooKeeper Servers shortly after adding them can cause ZooKeeper data loss when the number of new servers exceeds the number of old servers.

The POODLE (Padding Oracle On Downgraded Legacy Encryption) attack takes advantage of a cryptographic flaw in the obsolete SSLv3 protocol, after first forcing the use of that protocol. The only solution is to disable SSLv3 entirely. This requires changes across a wide variety of components of CDH and Cloudera Manager. Cloudera Manager 5.0.5 provides these changes for Cloudera Manager 5.0.x deployments. All Cloudera Manager 5.0.x users should upgrade to 5.0.5 as soon as possible. For more information, see the Cloudera Security Bulletin.

Impala 1.3.1 contains changes to the runtime profile format that break the Cloudera Manager Query Monitoring feature. This leads to exceptions in the Cloudera Manager Service Monitor logs, and Impala queries no longer appear in the Cloudera Manager UI or API. The issue affects Cloudera Manager 5.0 and 4.6 - 4.8.2.

Workaround: None. To avoid the Service Monitor exceptions, turn off the Cloudera Manager Query Monitoring feature by going to Impala Daemon > Monitoring and setting the Query Monitoring Period to 0 seconds. Note that the Impala Daemons must be restarted when changing this setting, and the setting must be restored once the fix is deployed to turn the query monitoring feature back on. Impala queries will then appear again in Cloudera Manager’s Impala query monitoring feature. Fixed in Cloudera Manager 5.0.2.

Certain configuration values that are stored in Cloudera Manager are considered sensitive, such as database passwords. These configuration values should be inaccessible to non-administrator users, and this is enforced in the Cloudera Manager Administration Console. However, these configuration values are not redacted when they are read through the API, possibly making them accessible to users who should not have such access.

Gateway configurations set for gateway role groups other than the default one or at the role level were not being respected.

The Cloudera Manager manual Configuring Hadoop Security with Cloudera Manager now indicates that before enabling Kerberos authentication you should first enable at least Level 1 encryption.

The NFS gateway cannot be started on some Cloudera-supported platforms.

Workaround: None. Fixed in Cloudera Manager 5.0.1.

If yarn.application.classpath was set to a non-default value on a CDH 4 cluster, and that cluster is upgraded to CDH 5, the classpath is not updated to reflect that $YARN_HOME was replaced with $HADOOP_YARN_HOME. This will cause YARN jobs to fail.

Workaround: Reset yarn.application.classpath to the default, then re-apply your classpath customizations if needed. Fixed in Cloudera Manager 5.0.1.

In versions of Cloudera Manager earlier than 4.8.3 and earlier than 5.0.1, user passwords are only hashed once. Passwords should be hashed multiple times to increase the cost of dictionary based attacks, where an attacker tries many candidate passwords to find a match. The issue only affects user accounts that are stored in the Cloudera Manager database. User accounts that are managed externally (for example, with LDAP or Active Directory) are not affected.

In addition, because of this issue, Cloudera Manager 4.8.3 cannot be upgraded to Cloudera Manager 5.0.0. Cloudera Manager 4.8.3 must be upgraded to 5.0.1 or later.

Workaround: Upgrade to Cloudera Manager 5.0.1.

Upgrading to Cloudera Manager 5.0.0 from SUSE Linux Enterprise Server (SLES) older than Service Pack 3 will fail if the embedded PostgreSQL database is in use and the installed version of PostgreSQL is less than 8.4.

Workaround: Either migrate away from the embedded PostgreSQL database (use MySQL or Oracle) or upgrade PostgreSQL to 8.4 or greater. Fixed in Cloudera Manager 5.0.1.

When running the MR1 to MR2 import on a secure cluster, YARN jobs will fail to find container-executor.cfg.

Workaround: Restart YARN after the import. Fixed in Cloudera Manager 5.0.1.

After an upgrade from CDH 4 to CDH 5, Oozie does not pick up the new workflow extension schemas automatically. User will need to update oozie.service.SchemaService.wf.ext.schemas manually and add the schemas added in CDH 5: shell-action-0.3.xsd, sqoop-action-0.4.xsd, distcp-action-0.2.xsd, oozie-sla-0.1.xsd, oozie-sla-0.2.xsd. Note: None of the existing jobs will be affected by this bug, only new workflows that require new schemas.

Workaround: Add the new workflow extension schemas to Oozie manually by editing oozie.service.SchemaService.wf.ext.schemas. Fixed in Cloudera Manager 5.0.1.

During an upgrade from CDH 4 to CDH 5, if the HDFS File Block Storage Locations Timeout was previously set to a custom value, it will now be set to 10 seconds or the custom value, whichever is higher. This is required for Impala to start in CDH 5, and any value under 10 seconds is now a validation error. This configuration is only emitted for Impala and no services should be adversely impacted.

Workaround: None.

In a secure CDH 4.1 cluster, Hue and Impala cannot share the same Hive instance. If "Bypass Hive Metastore Server" is disabled on the Hive service, then Hue will not be able to talk to Hive. Conversely, if "Bypass Hive Metastore" enabled on the Hive service, then Impala will have a validation error.

Severity: High

Workaround: Upgrade to CDH 4.2.

If installing CDH 4 packages, the Impala 1.3.0 option listed in the install wizard does not work because Impala 1.3.0 is not yet released for CDH 4.

Workaround: Install using parcels (where the unreleased version of Impala does not appear), or select a different version of Impala when installing with packages.

When updating dynamic resource pools, Cloudera Manager automatically refreshes the affected roles, but they sometimes get marked incorrectly as running with outdated configurations and requiring a refresh.

Workaround: Invoke the Refresh Cluster command from the cluster actions drop-down menu.

Contact Cloudera Support before upgrading from Cloudera Manager 5.0.0 beta 1 or beta 2 to Cloudera Manager 5.0.0.

Workaround: Contact Cloudera Support.

HDFS replication between clusters in different Kerberos realms fails when using YARN if the target cluster is CDH 5.

Workaround: Use MapReduce (MRv1) instead of YARN.

When upgrading a secure cluster via Cloudera Manager, the upgrade initially fails due to the JDK not having Java Cryptography Extension (JCE) unlimited strength policy files. This is because Cloudera Manager installs a copy of the Java 7 JDK during the upgrade, which does not include the unlimited strength policy files. To ensure that unlimited strength functionality continues to work, install the unlimited strength JCE policy files immediately after completing the Cloudera Manager Upgrade Wizard and before taking any other actions in Cloudera Manager.

Workaround: Install the unlimited strength JCE policy files immediately after completing the Cloudera Manager Upgrade Wizard and before taking any other action in Cloudera Manager.

The Details link for MapReduce jobs is wrong for YARN-based replications.

Workaround: Find the job id in the link and then go to the YARN Applications page and look for the job there.

HDFS replication does not work from CDH 5 to CDH 4 with different realms. This is because authentication fails for services in a non-default realm via the WebHdfs API due to a JDK bug. This has been fixed in JDK6-u34 (b03)) and in JDK7.

Workaround: Use JDK 7 or upgrade JDK 6 to at least version u34.

If you take a snapshot of an HBase table, and then delete that table in HBase, you will not be able to restore the snapshot.

Workaround: Use the "Restore As" command to recreate the table in HBase. Fixed in Cloudera Manager 5.0.0.

When enabling HDFS Automatic Failover, you need to first stop any dependent HBase services. The Automatic Failover configuration workflow restarts both NameNodes, which could cause HBase to become unavailable.

Severity: Medium

In CDH 4.1, Oozie introduced new versions for Hive, Sqoop and workflow schema. To use them, you must add the new schema extensions to the Oozie SchemaService Workflow Extension Schemas configuration property in Cloudera Manager.

Workaround: In Cloudera Manager, do the following:

1. Go to the CDH 4 Oozie service page.
2. Go to the Configuration tab, View and Edit.
3. Search for "Oozie Schema". This should show the Oozie SchemaService Workflow Extension Schemas property.
4. Add the following to the Oozie SchemaService Workflow Extension Schemas property:

   shell-action-0.2.xsd
   hive-action-0.3.xsd
   sqoop-action-0.3.xsd

5. Save these changes.

Cloudera Manager 5.0.0 sets the default YARN Resource Scheduler to FairScheduler. If a cluster was previously running YARN with the FIFO scheduler, it will be changed to FairScheduler next time YARN restarts. The FairScheduler is only supported with CDH4.2.1 and later, and older clusters may hit failures and need to manually change the scheduler to FIFO or CapacityScheduler.

The Resource Pools Summary does not show correct information if the Time Range selector is set to show 6 hours or more.

Workaround: None.

Workaround: Restart YARN after the import steps finish. This causes the file to be created under the YARN configuration path, and the jobs now work.

When upgrading to Cloudera Manager 5.0.0, users will not be able to directly access the "Dynamic Resource Pools" page. Instead, they will be presented with a dialog saying that the Fair Scheduler XML Advanced Configuration Snippet is set.

Workaround: None.

Spark on YARN requires the following manual configuration to work correctly: modify the YARN Application Classpath by adding /etc/hadoop/conf, making it the very first entry.

Workaround: Add /etc/hadoop/conf as the first entry in the YARN Application classpath.

Cloudera Manager monitoring does not work out of the box with Solr and Sentry on Cloudera Manager 5. The Solr service is in Bad health, and all Solr Servers have a failing "Solr Server API Liveness" health check.

Workaround: Complete the configuration steps below:

1. Create "HTTP" user and group on all machines in the cluster (with useradd 'HTTP' on RHEL-type systems).
2. The instructions that follow this step assume there is no existing Solr Sentry policy file in use. In that case, first create the policy file on /tmp and then copy it over to the appropriate location in HDFS that Solr Servers check. If there is already a Solr Sentry policy in use, it must be modified to add the following [group] / [role] entries for 'HTTP'. Create a file (for example, /tmp/cm-authz-solr-sentry-policy.ini) with the following contents:

   [groups]
   HTTP = HTTP
   [roles]
   HTTP = collection = admin->action=query

3. Copy this file to the location for the "Sentry Global Policy File" for Solr. The associated config name for this location is sentry.solr.provider.resource, and you can see the current value by navigating to the Sentry sub-category in the Service Wide configuration editing workflow in the Cloudera Manager UI. The default value for this entry is /user/solr/sentry/sentry-provider.ini. This refers to a path in HDFS.
4. Check if you have entries in HDFS for the parent(s) directory:

   sudo -u hdfs hadoop fs -ls /user

5. You may need to create the appropriate parent directories if they are not present. For example:

   sudo -u hdfs hadoop fs -mkdir /user/solr/sentry

6. After ensuring the parent directory is present, copy the file created in step 2 to this location, as follows:

   sudo -u hdfs hadoop fs -put /tmp/cm-authz-solr-sentry-policy.ini /user/solr/sentry/sentry-provider.ini

7. Ensure that this file is owned/readable by the solr user (this is what the Solr Server runs as):

   sudo -u hdfs hadoop fs -chown solr /user/solr/sentry/sentry-provider.ini

8. Restart the Solr service. If both Kerberos and Sentry are being enabled for Solr, the MGMT services also need to be restarted. The Solr Server liveness health checks should clear up once SMON has had a chance to contact the servers and retrieve metrics.

Out-of-memory errors may occur when using the Cloudera Manager Reports Manager.

Workaround: Set the value of the "Java Heap Size of Reports Manager" property to at least the size of the HDFS filesystem image (fsimage) and restart the Reports Manager.

Cloudera Manager is designed to work with IE 9 and above and Safari. However the file upload widget used to upload a license currently doesn't work with IE 9 or Safari. Therefore, installing an enterprise license doesn't work.

Workaround: Use another supported browser.

Due to a bug in Hadoop's handling of multiple RPC clients with distinct configurations within a single process with Kerberos security enabled, Cloudera Manager will disable the HDFS canary test when security is enabled so as to prevent interference with Cloudera Manager's MapReduce monitoring functionality.

Workaround: None

When MapReduce v1 configurations are imported for use by YARN (MR2), not all of the monitoring configuration values are currently migrated. Users may need to reconfigure custom values for properties such as thresholds.

Workaround: Manually reconfigure any missing property values.

After starting a 60-day trial or installing a license for Enterprise Edition, you may see an "access denied" message when attempting to access certain Enterprise Edition-only features such as the Reports Manager. You need to log out of the Admin Console and log back in to access these features.

Workaround: Log out of the Admin Console and log in again.

When using Impala with impersonation, the impersonation_enabled flag must be present and configured in the hue.ini file. If impersonation is enabled in Impala (i.e. Impala is using Sentry) then this flag must be set true. If Impala is not using impersonation, it should be set false (the default).

After an upgrade from Cloudera Manager 4.6.3 to 4.7 when Navigator is used, Impala will fail to start because the Audit Log Directory property has not been set by the upgrade procedure.

Workaround: Manually set the property to /var/log/impalad/audit. See the Service Auditing Properties section of the Cloudera Navigator Installation and User Guide for more information.