Auth bypass in Apache Pulsar
CVE-2021-41571
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.
Vulnerability class: Broken Access Control
EPSS: 0.017 (75.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Apache Pulsar — versions 2.8.0
- Apache Software Foundation Pulsar — versions Apache Pulsar
Weakness classification (CWE)
References
- security@apache.org (Patch, x_refsource_MISC, Vendor Advisory)
- security@apache.org (Exploit, Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- security@apache.org (Mailing List, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-41571?
- CVE-2021-41571 is a medium-severity vulnerability in Apache Pulsar, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2022-02-01.
- How severe is CVE-2021-41571?
- Medium severity. CVSS v3 base score is 6.5 out of 10.