CVE-2021-3312: Opencms core Opencms-core Vulnerability

MODERATE
Advisory Identifier: GHSA-g6v7-vqhx-6v6c
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CVSS 6.5
CWE-611
Published
Advisory Summary

CVE-2021-3312 is a MODERATE (CVSS 6.5) opencms-core vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting Opencms core libraries in the Maven ecosystem. The issue involves opencms-core. Remediation is available by upgrading affected packages to version 12.0.0.

CVE-2021-3312 at a Glance

CVE Identifier CVE-2021-3312
GHSA Identifier GHSA-g6v7-vqhx-6v6c
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-611: Improper Restriction of XML External Entity Reference
Affected Product Opencms core
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2021-3312

To remediate this vulnerability, upgrade all affected Opencms core 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.opencms:opencms-core fixed: 12.0.0 
<dependency>
    <groupId>org.opencms</groupId>
    <artifactId>opencms-core</artifactId>
    <version>12.0.0</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.opencms

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2021-3312, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.opencms

Analyze the terminal output to locate any version of Opencms core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 12.0.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.opencms 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-611: Improper Restriction of XML External Entity Reference, where the product processes an xml document that can contain xml entities with uris that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. In Opencms core, 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

An XML external entity (XXE) vulnerability in Alkacon OpenCms 11.0, 11.0.1 and 11.0.2 allows remote authenticated users with edit privileges to exfiltrate files from the server's file system by uploading a crafted SVG document.

CVE-2021-3312 Affected Opencms core Versions

1 component(s)
Fixed Versions:
12.0.0
Product / Package Ecosystem Affected Versions Fixed Version
org.opencms:opencms-core
maven/org.opencms/opencms-core
Maven
≥ 11.0.0
< 12.0.0
12.0.0

References

NVD — CVE-2021-3312 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-3312
Opencms core Source Repository REPOSITORY
https://github.com/alkacon/opencms-core/issues/721
Opencms core Source Repository REPOSITORY
https://github.com/alkacon/opencms-core/issues/725
Security Fix Commit FIX COMMIT
https://github.com/alkacon/opencms-core/commit/92e035423aa6967822d343e54392d4291648c0ee
Opencms core Source Repository REPOSITORY
https://github.com/alkacon/opencms-core
Opencms core Source Repository REPOSITORY
https://github.com/alkacon/opencms-core/releases

Frequently Asked Questions

What is CVE-2021-3312?
CVE-2021-3312 is a security vulnerability in Opencms core involving opencms-core under CWE-611: Improper Restriction of XML External Entity Reference.
Which Opencms core versions are affected?
Affected versions include releases prior to 12.0.0 across affected packages: org.opencms:opencms-core.
What version fixes CVE-2021-3312?
Upgrading to 12.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is opencms-core affected?
Yes, org.opencms:opencms-core is affected in releases prior to 12.0.0. Upgrade your dependency to 12.0.0 or later.
What is the CVSS score of CVE-2021-3312?
CVE-2021-3312 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2021-3312?
CVE-2021-3312 is classified under CWE-611: Improper Restriction of XML External Entity Reference (The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.).
How can I check Maven dependencies for CVE-2021-3312?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.opencms'. 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-g6v7-vqhx-6v6c",
  "modified" : "2021-10-18T13:50:38Z",
  "published" : "2021-10-12T17:23:40Z",
  "aliases" : [ "CVE-2021-3312" ],
  "summary" : "XML External Entity Reference in org.opencms:opencms-core",
  "details" : "An XML external entity (XXE) vulnerability in Alkacon OpenCms 11.0, 11.0.1 and 11.0.2 allows remote authenticated users with edit privileges to exfiltrate files from the server's file system by uploading a crafted SVG document.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.opencms:opencms-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "11.0.0"
      }, {
        "fixed" : "12.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 11.0.2"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-3312"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alkacon/opencms-core/issues/721"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alkacon/opencms-core/issues/725"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alkacon/opencms-core/commit/92e035423aa6967822d343e54392d4291648c0ee"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/alkacon/opencms-core"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/alkacon/opencms-core/releases"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-611" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-11T18:55:10Z",
    "nvd_published_at" : "2021-10-08T15:15:00Z"
  }
}