CVE-2021-31522: Kylin Kylin Can Receive User Input Vulnerability

MODERATE
Advisory Identifier: GHSA-q656-g2x3-8cgh
Share
CWE-470
Published
Advisory Summary

CVE-2021-31522 is a MODERATE kylin can receive user input vulnerability (CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')) affecting Kylin libraries in the Maven ecosystem. The issue involves kylin can receive user input and load any class through class.forname(...).. Remediation is available by upgrading affected packages to version 3.1.3, 4.0.1.

CVE-2021-31522 at a Glance

CVE Identifier CVE-2021-31522
GHSA Identifier GHSA-q656-g2x3-8cgh
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')
Affected Product Kylin
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-31522

To remediate this vulnerability, upgrade all affected Kylin 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.kylin:kylin fixed: 3.1.3 
<dependency>
    <groupId>org.apache.kylin</groupId>
    <artifactId>kylin</artifactId>
    <version>3.1.3</version>
</dependency>
org.apache.kylin:kylin fixed: 4.0.1 
<dependency>
    <groupId>org.apache.kylin</groupId>
    <artifactId>kylin</artifactId>
    <version>4.0.1</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.kylin

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-31522, inspect your build dependencies using the Maven Dependency Plugin:

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

Analyze the terminal output to locate any version of Kylin in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.3), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.kylin 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-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection'), where the product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code. In Kylin, 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

Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.

CVE-2021-31522 Affected Kylin Versions

2 component(s)
Fixed Versions:
3.1.34.0.1
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.kylin:kylin
maven/org.apache.kylin/kylin
Maven
< 3.1.3
3.1.3
org.apache.kylin:kylin
maven/org.apache.kylin/kylin
Maven
≥ 4.0.0
< 4.0.1
All 1 versions
4.0.0
4.0.1

References

NVD — CVE-2021-31522 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31522
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin/pull/1695
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin/pull/1763
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin
lists.apache.org/thread/hh5crx3yr701... WEB
https://lists.apache.org/thread/hh5crx3yr701zd8wtpqo1mww2rlkvznw
Kylin Security Information SECURITY
http://www.openwall.com/lists/oss-security/2022/01/06/4

Frequently Asked Questions

What is CVE-2021-31522?
CVE-2021-31522 is a security vulnerability in Kylin involving Kylin can receive user input and load any class through Class.forName(...). under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection').
Which Kylin versions are affected?
Affected versions include releases prior to 3.1.3, 4.0.1 across affected packages: org.apache.kylin:kylin.
What version fixes CVE-2021-31522?
Upgrading to 3.1.3, 4.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is kylin affected?
Yes, org.apache.kylin:kylin is affected in releases prior to 3.1.3, 4.0.1. Upgrade your dependency to 3.1.3, 4.0.1 or later.
What CWE is associated with CVE-2021-31522?
CVE-2021-31522 is classified under CWE-470: Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') (The product uses external input with reflection to select which classes or code to use, but it does not sufficiently prevent the input from selecting improper classes or code.).
How can I check Maven dependencies for CVE-2021-31522?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.kylin'. 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-q656-g2x3-8cgh",
  "modified" : "2022-01-07T23:21:51Z",
  "published" : "2022-01-08T00:43:01Z",
  "aliases" : [ "CVE-2021-31522" ],
  "summary" : "Kylin can receive user input and load any class through Class.forName(...).",
  "details" : "Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.kylin:kylin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.kylin:kylin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "4.0.0"
      }, {
        "fixed" : "4.0.1"
      } ]
    } ],
    "versions" : [ "4.0.0" ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31522"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/kylin/pull/1695"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/kylin/pull/1763"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/kylin"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/hh5crx3yr701zd8wtpqo1mww2rlkvznw"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2022/01/06/4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-470" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-07T23:21:51Z",
    "nvd_published_at" : "2022-01-06T13:15:00Z"
  }
}