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

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.809 (99.6th percentile), scored .

High probability of exploitation in the next 30 days — patch promptly. 100th percentile — 99.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-36749: held from 0.809 to 0.809.

EPSS over last 30 days · oldest: 0.809 · newest: 0.809 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

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.