high
7.5
CWE
22 23
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2020-17518: Apache Flink directory traversal attack: remote file writing through the REST API

First published: Tue Jan 05 2021(Updated: )

Apache Flink 1.5.1 introduced a REST handler that allows you to write an uploaded file to an arbitrary location on the local file system, through a maliciously modified HTTP HEADER. The files can be written to any location accessible by Flink 1.5.1. 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 a5264a6f41524afe8ceadf1d8ddc8c80f323ebc4 from apache/flink:master.

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

Affected SoftwareAffected VersionHow to fix
redhat/flink<1.11.3
1.11.3
redhat/flink<1.12.0
1.12.0
Apache Flink>=1.5.1<1.11.3
maven/org.apache.flink:flink-runtime>=1.5.1<1.11.3
1.11.3

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Parent vulnerabilities

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Frequently Asked Questions

  • What is the severity of CVE-2020-17518?

    CVE-2020-17518 is considered a high severity vulnerability due to its potential to allow unauthorized file access and modification.

  • How do I fix CVE-2020-17518?

    To fix CVE-2020-17518, upgrade Apache Flink to version 1.11.3 or later.

  • What versions of Apache Flink are affected by CVE-2020-17518?

    Apache Flink versions from 1.5.1 up to but not including 1.11.3 are affected by CVE-2020-17518.

  • What kind of attack is CVE-2020-17518 associated with?

    CVE-2020-17518 is associated with an attack that can exploit a REST handler to overwrite files on the server's file system.

  • Is CVE-2020-17518 related to file upload vulnerabilities?

    Yes, CVE-2020-17518 is a file upload vulnerability that allows malicious uploads to be written to arbitrary locations.

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