CVE-2020-17519: Apache Flink directory traversal attack: reading remote files through the REST API

First published: Tue Jan 05 2021(Updated: )

A change introduced in Apache Flink 1.11.0 (and released in 1.11.1 and 1.11.2 as well) allows attackers to read any file on the local filesystem of the JobManager through the REST interface of the JobManager process. Access is restricted to files accessible by the JobManager process. All users should upgrade to Flink 1.11.3 or 1.12.0 if their Flink instance(s) are exposed. The issue was fixed in commit b561010b0ee741543c3953306037f00d7a9f0801 from apache/flink:master.

Credit: security@apache.org security@apache.org

Affected Software	Affected Version	How to fix
Apache Flink	>=1.11.0<=1.11.2
maven/org.apache.flink:flink-runtime_2.12	>=1.11.0<1.11.3	1.11.3
Apache Flink	>=1.11.0<1.11.3

Remedy

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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