Medium severity · published Feb 1, 2022
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
6.5
CVSS
1.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.7% · higher than 77% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PU
Pulsar · Apache
2.6.0 before 2.6.4; 2.7.0 before 2.7.3; 2.8.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-41571
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-41571
Exploit
https://github.com/apache/pulsar/issues/11814
Mailing List
https://lists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvr
Patch
https://pulsar.apache.org/admin-rest-api/#operation/getLastMessageId
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