CVE-2021-26920: Druid core Remote Code Execution Vulnerability
MODERATECVE-2021-26920 is a MODERATE (CVSS 6.5) remote code execution vulnerability (CWE-863: Incorrect Authorization) affecting Druid core libraries in the Maven ecosystem. The issue involves druid ingestion system authenticated users can read data from other sources than intended. Remediation is available by upgrading affected packages to version 0.21.0.
CVE-2021-26920 at a Glance
Security Impact
CVSS: 6.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N).
How to Fix CVE-2021-26920
To remediate this vulnerability, upgrade all affected Druid core dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
<dependency>
<groupId>org.apache.druid</groupId>
<artifactId>druid-core</artifactId>
<version>0.21.0</version>
</dependency>Run the following command in your project directory to verify that all resolved dependencies use the patched release:
mvn dependency:tree -Dincludes=org.apache.druidHow to Check if You Are Affected
To determine whether your Java application is affected by CVE-2021-26920, inspect your build dependencies using the Maven Dependency Plugin:
mvn dependency:tree -Dincludes=org.apache.druidAnalyze the terminal output to locate any version of Druid core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.21.0), your application is affected.
Note: The mvn dependency:tree -Dincludes=org.apache.druid command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Druid core, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2021-26920 Affected Druid core Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
org.apache.druid:druid-core
|
Maven |
< 0.21.0
|
0.21.0
|
References
Frequently Asked Questions
What is CVE-2021-26920?
Which Druid core versions are affected?
What version fixes CVE-2021-26920?
Is druid-core affected?
What is the CVSS score of CVE-2021-26920?
What CWE is associated with CVE-2021-26920?
How can I check Maven dependencies for CVE-2021-26920?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-793h-6f7r-6qvm",
"modified" : "2023-09-26T13:12:16Z",
"published" : "2021-08-13T15:21:50Z",
"aliases" : [ "CVE-2021-26920" ],
"summary" : "Druid ingestion system Authenticated users can read data from other sources than intended",
"details" : "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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Maven",
"name" : "org.apache.druid:druid-core"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "0.21.0"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26920"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread.html/r29e45561343cc5cf7d3290ee0b0e94e565faab19c20d022df9b5e29c%40%3Cdev.druid.apache.org%3E"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread.html/r304dfe56a5dfe1b2d9166b24d2c74ad1c6730338b20aef77a00ed2be@%3Cannounce.apache.org%3E"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread.html/r61aab724cf97d80da7f02d50e9af6de5c7c40dd92dab7518746fbaa2@%3Cannounce.apache.org%3E"
}, {
"type" : "WEB",
"url" : "https://lists.apache.org/thread.html/rc9400a70d0ec5cdb8a3486fc5ddb0b5282961c0b63e764abfbcb9f5d@%3Cdev.druid.apache.org%3E"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2021/07/02/1"
}, {
"type" : "WEB",
"url" : "http://www.openwall.com/lists/oss-security/2021/09/24/1"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-863" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2021-07-06T15:02:28Z",
"nvd_published_at" : "2021-07-02T08:15:00Z"
}
}