CVE-2020-17519 Apache Flink: login or permission bypass
In plain words: A door that should be locked is not: part of the system can be reached without a valid login or permission. The attacker gets in as a user or administrator without knowing a password.
Confirmed exploited by CISA on · US federal patch deadline Jun 13, 2024
What to do
- Install Apache's security update for Flink. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Apache Flink Improper Access Control Vulnerability
- Product
- Apache Flink
- CISA description
- Apache Flink contains an improper access control vulnerability that allows an attacker to read any file on the local filesystem of the JobManager through its REST interface.
- Type of flaw
- Login or permission bypass (CWE-552)
- Confirmed exploited
- May 23, 2024
- US federal patch deadline
- Jun 13, 2024
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Answering about CVE-2020-17519 ·
Questions about CVE-2020-17519
Is CVE-2020-17519 being exploited?
Yes. CISA added CVE-2020-17519 to its Known Exploited Vulnerabilities catalog on May 23, 2024, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2020-17519?
Install Apache's security update for Flink. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2020-17519?
Only if you use Apache Flink. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.