CVE-2020-1960: Apache Flink JMX information disclosure vulnerability

Severity: Medium

The Apache Software Foundation

Versions Affected:
Flink 1.1.0 to 1.1.5
Flink 1.2.0 to 1.2.1
Flink 1.3.0 to 1.3.3
Flink 1.4.0 to 1.4.2
Flink 1.5.0 to 1.5.6
Flink 1.6.0 to 1.6.4
Flink 1.7.0 to 1.7.2
Flink 1.8.0 to 1.8.3
Flink 1.9.0 to 1.9.2
Flink 1.10.0

When running a process with an enabled JMXReporter, with a port configured via metrics.reporter.<reporter_name>.port, an attacker with local access to the machine and JMX port can execute a man-in-the-middle attack using a specially crafted request to rebind the JMXRMI registry to one under the attacker's control. This compromises any connection established to the process via JMX, allowing extraction of credentials and any other transferred data.

All users should either
- remove the port parameter from the reporter configuration,
- upgrade to 1.9.3 or 1.10.1,
- obtain the source for their release from the Flink website or git and apply the patch corresponding to their version from the list below:

1.1: a61b5d2b362d11e7b9deeb2334d275325574bd7b
1.2: d2a051267ffbeef5c1fd981860fb7032d9ac8a60
1.3: 4f06bb75cd726096af43587ca4fb182b2e4bae2e
1.4: 12787eceb49c566b28aa876fc2892d21a0ec3d79
1.5: f9b4e0dea71abbcd6463c757577c70c45b3e6bbf
1.6: b8647b1ca019003ae939b7494bba4e54de167b6f
1.7: 5e0b7970a9aea74aba4ebffaa75c37e960799b93
1.8: 0e8e8062bcc159e9ed2a0d4a0a61db4efcb01f2f
1.9: 58b58f4b16a2e25c95b465377d43a51ad8ef3f6a
1.10: 804ae70024bf8be7c0c7093d02addb080c318662

The issue was discovered in Flink by Jonathan Gallimore, Tomitribe and Colm O hEigeartaigh, Talend. The underlying vulnerability pattern was discovered by An Trinh and published at Blackhat.

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