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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14799) Commons-collections object deserialization remote command execution vulnerability
Date Thu, 12 Nov 2015 02:10:11 GMT
Andrew Purtell created HBASE-14799:
--------------------------------------

             Summary: Commons-collections object deserialization remote command execution
vulnerability 
                 Key: HBASE-14799
                 URL: https://issues.apache.org/jira/browse/HBASE-14799
             Project: HBase
          Issue Type: Bug
            Reporter: Andrew Purtell
            Priority: Critical
             Fix For: 0.94.28, 0.98.17


Read: http://foxglovesecurity.com/2015/11/06/what-do-weblogic-websphere-jboss-jenkins-opennms-and-your-application-have-in-common-this-vulnerability/

TL;DR: If you have commons-collections on your classpath and accept and process Java object
serialization data, then you probably have an exploitable remote command execution vulnerability.


0.94 and earlier HBase releases are vulnerable because we might read in and rehydrate serialized
Java objects out of RPC packet data in HbaseObjectWritable using ObjectInputStream#readObject
(see https://hbase.apache.org/0.94/xref/org/apache/hadoop/hbase/io/HbaseObjectWritable.html#714)
and we have commons-collections on the classpath on the server.

0.98 also carries some limited exposure to this problem through inclusion of backwards compatible
deserialization code in HbaseObjectWritableFor96Migration. This is used by the 0.94-to-0.98
migration utility, and by the AccessController when reading permissions from the ACL table
serialized in legacy format by 0.94. Unprivileged users cannot run the tool nor access the
ACL table.

Unprivileged users can however attack a 0.94 installation. An attacker might be able to use
the method discussed on that blog post to capture valid HBase RPC payloads for 0.94 and prior
versions, rewrite them to embed an exploit, and replay them to trigger a remote command execution
with the privileges of the account under which the HBase RegionServer daemon is running.

We need to make a patch release of 0.94 that changes HbaseObjectWritable to disallow processing
of random Java object serializations. This will be a compatibility break that might affect
old style coprocessors, which quite possibly rely on this catch-all in HbaseObjectWritable
for custom object (de)serialization. We can introduce a new configuration setting, "hbase.allow.legacy.object.serialization",
defaulting to false.

To be thorough, we can also use the new configuration setting  "hbase.allow.legacy.object.serialization"
(defaulting to false) in 0.98 to prevent the AccessController from falling back to the vulnerable
legacy code. This would need to be changed to 'true' to re-enable support of auto-migration
of ACL data whenever migrating from 0.94.



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