ESB-2018.1547 - [Win][UNIX/Linux] Zookeeper: Provide misleading information - Remote/unauthenticated 2018-05-22

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1547
            Apache ZooKeeper Quorum Peer mutual authentication
                                22 May 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Zookeeper
Publisher:         Apache
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8012  

Original Bulletin: 
   https://issues.apache.org/jira/browse/ZOOKEEPER-1045

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CVE-2018-8012: Apache ZooKeeper Quorum Peer mutual authentication

Severity: Critical

Vendor:
The Apache Software Foundation

Versions Affected:
ZooKeeper prior to 3.4.10
ZooKeeper 3.5.0-alpha through 3.5.3-beta
The unsupported ZooKeeper 1.x through 3.3.x versions may be also affected

Description:
No authentication/authorization is enforced when a server attempts to join
a quorum. As a result an arbitrary end point could join the cluster and
begin propagating counterfeit changes to the leader.

Mitigation:
Upgrade to 3.4.10 or later (3.5.4-beta or later if on the 3.5 branch) and
enable Quorum Peer mutual authentication.

Alternately ensure the ensemble election/quorum communication is protected
by a firewall as this will mitigate the issue.

See the documentation for more details on correct cluster administration.

Credit:
This issue was identified by Foldi Tamas and Eugene Koontz

References:
https://issues.apache.org/jira/browse/ZOOKEEPER-1045
https://cwiki.apache.org/confluence/display/ZOOKEEPER/Server-Server+mutual+=
authentication
http://zookeeper.apache.org/doc/current/zookeeperAdmin.html

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