CVE-2021-27738: Kylin Server-Side Request Forgery Vulnerability

MODERATE
Advisory Identifier: GHSA-wrx7-qgmj-mf2q
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CWE-918
Published
Advisory Summary

CVE-2021-27738 is a MODERATE server-side request forgery vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Kylin libraries in the Maven ecosystem. The issue involves server-side request forgery in apache kylin. Remediation is available by upgrading affected packages to version 3.1.3.

CVE-2021-27738 at a Glance

CVE Identifier CVE-2021-27738
GHSA Identifier GHSA-wrx7-qgmj-mf2q
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Kylin
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-27738

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>
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-2021-27738, 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. 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

All request mappings in `StreamingCoordinatorController.java` handling `/kylin/api/streaming_coordinator/*` REST API endpoints did not include any security checks, which allowed an unauthenticated user to issue arbitrary requests, such as assigning/unassigning of streaming cubes, creation/modification and deletion of replica sets, to the Kylin Coordinator. For endpoints accepting node details in HTTP message body, unauthenticated (but limited) server-side request forgery (SSRF) can be achieved. This issue affects Apache Kylin Apache Kylin 3 versions prior to 3.1.2.

CVE-2021-27738 Affected Kylin Versions

1 component(s)
Fixed Versions:
3.1.3
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.kylin:kylin
maven/org.apache.kylin/kylin
Maven
< 3.1.3
3.1.3

References

NVD — CVE-2021-27738 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-27738
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin/pull/1646
Kylin Source Repository REPOSITORY
https://github.com/apache/kylin
lists.apache.org/thread/vkohh0to2vzw... WEB
https://lists.apache.org/thread/vkohh0to2vzwymyb2x13fszs3cs3vd70
Kylin Security Information SECURITY
http://www.openwall.com/lists/oss-security/2022/01/06/6

Frequently Asked Questions

What is CVE-2021-27738?
CVE-2021-27738 is a security vulnerability in Kylin involving Server-Side Request Forgery in Apache Kylin under CWE-918: Server-Side Request Forgery (SSRF).
Which Kylin versions are affected?
Affected versions include releases prior to 3.1.3 across affected packages: org.apache.kylin:kylin.
What version fixes CVE-2021-27738?
Upgrading to 3.1.3 (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. Upgrade your dependency to 3.1.3 or later.
What CWE is associated with CVE-2021-27738?
CVE-2021-27738 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Maven dependencies for CVE-2021-27738?
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-wrx7-qgmj-mf2q",
  "modified" : "2022-01-07T23:16:38Z",
  "published" : "2022-01-08T00:43:04Z",
  "aliases" : [ "CVE-2021-27738" ],
  "summary" : "Server-Side Request Forgery in Apache Kylin",
  "details" : "All request mappings in `StreamingCoordinatorController.java` handling `/kylin/api/streaming_coordinator/*` REST API endpoints did not include any security checks, which allowed an unauthenticated user to issue arbitrary requests, such as assigning/unassigning of streaming cubes, creation/modification and deletion of replica sets, to the Kylin Coordinator. For endpoints accepting node details in HTTP message body, unauthenticated (but limited) server-side request forgery (SSRF) can be achieved. This issue affects Apache Kylin Apache Kylin 3 versions prior to 3.1.2.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.kylin:kylin"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-27738"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/kylin/pull/1646"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/kylin"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/vkohh0to2vzwymyb2x13fszs3cs3vd70"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2022/01/06/6"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-01-07T23:16:38Z",
    "nvd_published_at" : "2022-01-06T13:15:00Z"
  }
}