CVE-2021-44791: Druid Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-8rmv-98m4-g5c6
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-44791 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Druid libraries in the Maven ecosystem. The issue involves apache druid before 0.23.0 vulnerable to reflected xss via unescaped url parameters. Remediation is available by upgrading affected packages to version 0.23.0.

CVE-2021-44791 at a Glance

CVE Identifier CVE-2021-44791
GHSA Identifier GHSA-8rmv-98m4-g5c6
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Druid
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-44791

To remediate this vulnerability, upgrade all affected Druid dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.druid:druid fixed: 0.23.0 
<dependency>
    <groupId>org.apache.druid</groupId>
    <artifactId>druid</artifactId>
    <version>0.23.0</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.druid

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-44791, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.druid

Analyze the terminal output to locate any version of Druid in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.23.0), 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Druid, 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

In Apache Druid 0.22.1 and earlier, certain specially-crafted links result in unescaped URL parameters being sent back in HTML responses. This makes it possible to execute reflected XSS attacks. This issue is patched in version 0.23.0.

CVE-2021-44791 Affected Druid Versions

1 component(s)
Fixed Versions:
0.23.0
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.druid:druid
maven/org.apache.druid/druid
Maven
< 0.23.0
0.23.0

References

NVD — CVE-2021-44791 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-44791
Druid Source Repository REPOSITORY
https://github.com/apache/druid
lists.apache.org/thread/lh2kcl4j45q7... WEB
https://lists.apache.org/thread/lh2kcl4j45q7xj4w6rqf6kwf0mvyp2o6

Frequently Asked Questions

What is CVE-2021-44791?
CVE-2021-44791 is a security vulnerability in Druid involving Apache Druid before 0.23.0 vulnerable to reflected XSS via unescaped URL parameters under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Druid versions are affected?
Affected versions include releases prior to 0.23.0 across affected packages: org.apache.druid:druid.
What version fixes CVE-2021-44791?
Upgrading to 0.23.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is druid affected?
Yes, org.apache.druid:druid is affected in releases prior to 0.23.0. Upgrade your dependency to 0.23.0 or later.
What is the CVSS score of CVE-2021-44791?
CVE-2021-44791 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-44791?
CVE-2021-44791 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check Maven dependencies for CVE-2021-44791?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.druid'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8rmv-98m4-g5c6",
  "modified" : "2022-07-19T20:27:57Z",
  "published" : "2022-07-08T00:00:43Z",
  "aliases" : [ "CVE-2021-44791" ],
  "summary" : "Apache Druid before 0.23.0 vulnerable to reflected XSS via unescaped URL parameters",
  "details" : "In Apache Druid 0.22.1 and earlier, certain specially-crafted links result in unescaped URL parameters being sent back in HTML responses. This makes it possible to execute reflected XSS attacks. This issue is patched in version 0.23.0.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.druid:druid"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.23.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-44791"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/druid"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/lh2kcl4j45q7xj4w6rqf6kwf0mvyp2o6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-08T19:21:04Z",
    "nvd_published_at" : "2022-07-07T19:15:00Z"
  }
}