Auth bypass in Apache Druid
CVE-2021-36749
In the Druid ingestion system, the InputSource is used for reading data from a certain data source. However, the HTTP InputSource allows authenticated users to read data from other sources than intended, such as the local file system, with the privileges of the Druid server process. This is not an elevation of privilege when users access Druid directly, since Druid also provides the Local InputSource, which allows the same level of access. But it is problematic when users interact with Druid indirectly through an application that allows users to specify the HTTP InputSource, but not the Local InputSource. In this case, users could bypass the application-level restriction by passing a file URL to the HTTP InputSource. This issue was previously mentioned as being fixed in 0.21.0 as per CVE-2021-26920 but was not fixed in 0.21.0 or 0.21.1.
Vulnerability class: Broken Access Control
EPSS: 0.809 (99.6th 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 Druid
- Apache Software Foundation Druid — versions 0.21.1 and earlier
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@apache.org (Mailing List, x_refsource_MISC, Vendor Advisory)
- security@apache.org (mailing-list, x_refsource_MLIST)
Frequently asked questions
- What is CVE-2021-36749?
- CVE-2021-36749 is a medium-severity vulnerability in Apache Druid, classified under Incorrect Authorization. CVSS score: 6.5/10. Published 2021-09-24.
- How severe is CVE-2021-36749?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-36749 known to be exploited?
- 55 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.