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CVE-2021-41571

6.5 · MEDIUM

In Apache Pulsar it is possible to access data from BookKeeper that does not belong to the topics accessible by the authenticated user.

Published Feb 1, 2022CWE-863EPSS 1.73%

Overview

CVE-2021-41571 is a medium-severity vulnerability. It was published on February 1, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

In Apache Pulsar it is possible to access data from BookKeeper that does not belong to the topics accessible by the authenticated user. The Admin API get-message-by-id requires the user to input a topic and a ledger id. The ledger id is a pointer to the data, and it is supposed to be a valid it for the topic. Authorisation controls are performed against the topic name and there is not proper validation the that ledger id is valid in the context of such ledger. So it may happen that the user is able to read from a ledger that contains data owned by another tenant. This issue affects Apache Pulsar Apache Pulsar version 2.8.0 and prior versions; Apache Pulsar version 2.7.3 and prior versions; Apache Pulsar version 2.6.4 and prior versions.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/apache/pulsar/issues/11814Reflists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvrRefpulsar.apache.org/admin-rest-api/#operation/getLastMessageIdGitHubgithub.com/apache/pulsar/issues/11814Reflists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvrRefpulsar.apache.org/admin-rest-api/#operation/getLastMessageId

How CyberStrike helps

Frequently asked questions

What is CVE-2021-41571?

CVE-2021-41571 is a medium-severity vulnerability. It was published on February 1, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-41571?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-41571?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-41571?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-41571 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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