CVE-2021-45456: Kylin Command Injection Vulnerability

MODERATE
Advisory Identifier: GHSA-hw3m-8h25-8frw
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CWE-77
Published
Advisory Summary

CVE-2021-45456 is a MODERATE command injection vulnerability (CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')) affecting Kylin libraries in the Maven ecosystem. The issue involves command injection in apache kylin. Remediation is available by upgrading affected packages to version 4.0.1.

CVE-2021-45456 at a Glance

CVE Identifier CVE-2021-45456
GHSA Identifier GHSA-hw3m-8h25-8frw
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Affected Product Kylin
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-45456

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: 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-2021-45456, 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 4.0.1), 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-77: Improper Neutralization of Special Elements used in a Command ('Command Injection'), where the product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. 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

Apache kylin checks the legitimacy of the project before executing some commands with the project name passed in by the user. There is a mismatch between what is being checked and what is being used as the shell command argument in DiagnosisService. This may cause an illegal project name to pass the check and perform the following steps, resulting in a command injection vulnerability. This issue affects Apache Kylin 4.0.0.

CVE-2021-45456 Affected Kylin Versions

1 component(s)
Fixed Versions:
4.0.1
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.kylin:kylin
maven/org.apache.kylin/kylin
Maven
< 4.0.1
4.0.1

References

NVD — CVE-2021-45456 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-45456
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin/pull/1781
Security Fix Commit FIX COMMIT
https://github.com/apache/kylin/commit/f4daf14dde99b934c92ce2c832509f24342bc845
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin
lists.apache.org/thread/70fkf9w1swt2... WEB
https://lists.apache.org/thread/70fkf9w1swt2cqdcz13rwfjvblw1fcpf
Kylin Security Information SECURITY
http://www.openwall.com/lists/oss-security/2022/01/06/1

Frequently Asked Questions

What is CVE-2021-45456?
CVE-2021-45456 is a security vulnerability in Kylin involving Command Injection in Apache Kylin under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection').
Which Kylin versions are affected?
Affected versions include releases prior to 4.0.1 across affected packages: org.apache.kylin:kylin.
What version fixes CVE-2021-45456?
Upgrading to 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 4.0.1. Upgrade your dependency to 4.0.1 or later.
What CWE is associated with CVE-2021-45456?
CVE-2021-45456 is classified under CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.).
How can I check Maven dependencies for CVE-2021-45456?
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-hw3m-8h25-8frw",
  "modified" : "2022-01-07T22:53:55Z",
  "published" : "2022-01-08T00:42:59Z",
  "aliases" : [ "CVE-2021-45456" ],
  "summary" : "Command Injection in Apache Kylin",
  "details" : "Apache kylin checks the legitimacy of the project before executing some commands with the project name passed in by the user. There is a mismatch between what is being checked and what is being used as the shell command argument in DiagnosisService. This may cause an illegal project name to pass the check and perform the following steps, resulting in a command injection vulnerability. This issue affects Apache Kylin 4.0.0.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.kylin:kylin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-45456"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/kylin/pull/1781"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/kylin/commit/f4daf14dde99b934c92ce2c832509f24342bc845"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/kylin"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/70fkf9w1swt2cqdcz13rwfjvblw1fcpf"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2022/01/06/1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-77" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-07T22:48:38Z",
    "nvd_published_at" : "2022-01-06T13:15:00Z"
  }
}