Exploited
critical
9.1
CWE
552 22
Advisory Published
Advisory Published
Updated

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 SoftwareAffected VersionHow 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
Apache Flink>=1.11.0<1.11.3
>=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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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-17519?

    CVE-2020-17519 has a medium severity rating as it allows attackers to read any file on the local filesystem of the JobManager.

  • How do I fix CVE-2020-17519?

    To fix CVE-2020-17519, upgrade Apache Flink to version 1.11.3 or later.

  • What versions of Apache Flink are affected by CVE-2020-17519?

    CVE-2020-17519 affects Apache Flink versions from 1.11.0 to 1.11.2.

  • What is the impact of CVE-2020-17519?

    The impact of CVE-2020-17519 is that it allows unauthorized file access, leading to potential data leakage.

  • Is CVE-2020-17519 specific to any deployment environment?

    CVE-2020-17519 is specific to deployments using the JobManager process of Apache Flink.

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