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CVE-2020-17519GHSA-395W-QHQR-9FR6BIT-FLINK-2020-17519

Apache Flink directory traversal attack: reading remote files through the REST API

Published
Last modified
published
Listed in CISA KEV
Fix
Fixed in 1.11.3
None on Exploit-DB, Metasploit or GitHub

Summary

Apache Flink's JobManager REST interface is affected, allowing remote attackers to read arbitrary files that the JobManager process can access on the server's local filesystem. This exposes sensitive data stored on the host to anyone who can reach the exposed REST API.

Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.

Read the original description

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.

Timeline

  1. CVE published
  2. Added to CISA KEV

    CISA has evidence of exploitation in the wild

  3. CISA remediation deadline

    Due date for US federal agencies to patch

  4. Record last updated
  5. EPSS reached 10%

    FIRST estimates at least a 10% chance of exploitation in the next 30 days

Affected versions

  • Apache Software Foundation Apache Flink

    Apache Flink 1.11.0 to 1.11.2

  • org.apache.flink:flink-runtime_2.11Maven

    From 1.11.0 · fixed in 1.11.3

  • org.apache.flink:flink-runtime_2.12Maven

    From 1.11.0 · fixed in 1.11.3

References 16

lists.apache.org

openwall.com

packetstormsecurity.com