Apache Flink Improper Access Control Vulnerability

CheckOps priority index

9.0/10 Patch within 24 h

Severity9.1

Probability9.8

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 98.0% +0.2 pts in 7 days

CVSS 3.1 9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 894 days 23 May 2024

CISA due date 13 Jun 2024 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)23 May 2024
Exploited in EUVD (ENISA)23 May 2024
Used by ransomwareno
EPSS above 10 %98.0%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

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

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

Apache FlinkFlink

Affected versions

Apache Flink 1.11.0 to 1.11.2

Weaknesses (CWE)

CWE-552

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

05 Jan 2021
Published
23 May 2024
Exploitation reported (ENISA)
23 May 2024
Added to the KEV catalog
13 Jun 2024
CISA remediation due date
29 Oct 2026
EPSS peak: 98.0%

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