Vulnerabilities in pkg:maven/org.apereo.cas/cas-server-core-web

PACKAGE
Advisory Identifier: GHSA-gfhx-jjwq-63gv
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Advisory Summary

CVE-2021-42567 is a MODERATE cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Cas server core web libraries in the Maven ecosystem. The issue involves cross-site scripting in apereo cas. Remediation is available by upgrading affected packages to version 6.4.2.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/org.apereo.cas/cas-server-core-web

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/org.apereo.cas/cas-server-core-web. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-gfhx-jjwq-63gv CVE-2021-42567 MODERATE Cross-site Scripting in Apereo CAS

CVE-2021-42567 at a Glance

CVE Identifier CVE-2021-42567
GHSA Identifier GHSA-gfhx-jjwq-63gv
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Cas server core web
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2021-42567

To remediate this vulnerability, upgrade all affected Cas server core web 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.apereo.cas:cas-server-core-web fixed: 6.4.2 
<dependency>
    <groupId>org.apereo.cas</groupId>
    <artifactId>cas-server-core-web</artifactId>
    <version>6.4.2</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.apereo.cas

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-42567, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apereo.cas

Analyze the terminal output to locate any version of Cas server core web in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.4.2), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apereo.cas 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 Cas server core web, 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

Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.

CVE-2021-42567 Affected Cas server core web Versions

1 component(s)
Fixed Versions:
6.4.2
Product / Package Ecosystem Affected Versions Fixed Version
org.apereo.cas:cas-server-core-web
maven/org.apereo.cas/cas-server-core-web
Maven
< 6.4.2
6.4.2

References

NVD — CVE-2021-42567 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-42567
Security Fix Commit FIX COMMIT
https://github.com/apereo/cas/commit/376bf087d6d4267f61fc9f8028aa0d1ef407c3f0
apereo.github.io/2021/10/18/restvuln WEB
https://apereo.github.io/2021/10/18/restvuln
Cas server core web Source Repository REPOSITORY
https://github.com/apereo/cas
Cas server core web Source Repository REPOSITORY
https://github.com/apereo/cas/releases

Frequently Asked Questions

What is CVE-2021-42567?
CVE-2021-42567 is a security vulnerability in Cas server core web involving Cross-site Scripting in Apereo CAS under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Cas server core web versions are affected?
Affected versions include releases prior to 6.4.2 across affected packages: org.apereo.cas:cas-server-core-web.
What version fixes CVE-2021-42567?
Upgrading to 6.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is cas-server-core-web affected?
Yes, org.apereo.cas:cas-server-core-web is affected in releases prior to 6.4.2. Upgrade your dependency to 6.4.2 or later.
What CWE is associated with CVE-2021-42567?
CVE-2021-42567 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-2021-42567?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apereo.cas'. 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-gfhx-jjwq-63gv",
  "modified" : "2021-12-08T20:20:15Z",
  "published" : "2021-12-10T20:24:11Z",
  "aliases" : [ "CVE-2021-42567" ],
  "summary" : "Cross-site Scripting in Apereo CAS",
  "details" : "Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apereo.cas:cas-server-core-web"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-42567"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apereo/cas/commit/376bf087d6d4267f61fc9f8028aa0d1ef407c3f0"
  }, {
    "type" : "WEB",
    "url" : "https://apereo.github.io/2021/10/18/restvuln"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apereo/cas"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apereo/cas/releases"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-08T20:20:15Z",
    "nvd_published_at" : "2021-12-07T22:15:00Z"
  }
}