CVE-2020-12668: Jinjava Unauthorized Access To Class Instance Vulnerability

MODERATE
Advisory Identifier: GHSA-2hjr-fg6c-v2h6
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CVSS 6.5
CWE-200
Published
Advisory Summary

CVE-2020-12668 is a MODERATE (CVSS 6.5) unauthorized access to class instance vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Jinjava libraries in the Maven ecosystem. The issue involves unauthorized access to class instance in jinjava. Remediation is available by upgrading affected packages to version 2.5.4.

CVE-2020-12668 at a Glance

CVE Identifier CVE-2020-12668
GHSA Identifier GHSA-2hjr-fg6c-v2h6
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Jinjava
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-2020-12668

To remediate this vulnerability, upgrade all affected Jinjava dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

com.hubspot.jinjava:jinjava fixed: 2.5.4 
<dependency>
    <groupId>com.hubspot.jinjava</groupId>
    <artifactId>jinjava</artifactId>
    <version>2.5.4</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=com.hubspot.jinjava

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-12668, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=com.hubspot.jinjava

Analyze the terminal output to locate any version of Jinjava in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.4), your application is affected.

Note: The mvn dependency:tree -Dincludes=com.hubspot.jinjava 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-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Jinjava, 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

Jinjava before 2.5.4 allow access to arbitrary classes by calling Java methods on objects passed into a Jinjava context. This could allow for abuse of the application class loader, including Arbitrary File Disclosure.

CVE-2020-12668 Affected Jinjava Versions

1 component(s)
Fixed Versions:
2.5.4
Product / Package Ecosystem Affected Versions Fixed Version
com.hubspot.jinjava:jinjava
maven/com.hubspot.jinjava/jinjava
Maven
< 2.5.4
2.5.4

References

NVD — CVE-2020-12668 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-12668
Jinjava Source Repository REPOSITORY
https://github.com/HubSpot/jinjava/pull/426/commits/5dfa5b87318744a4d020b66d5f7747acc36b213b
Jinjava Source Repository REPOSITORY
https://github.com/HubSpot/jinjava/pull/435/commits/1b9aaa4b420c58b4a301cf4b7d26207f1c8d1165
Jinjava Source Repository REPOSITORY
https://github.com/HubSpot/jinjava/compare/jinjava-2.5.3...jinjava-2.5.4
Jinjava Release RELEASE
https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.5.4
GitHub Advisory / Wiki ADVISORY
https://securitylab.github.com/advisories/GHSL-2020-072-hubspot_jinjava

Frequently Asked Questions

What is CVE-2020-12668?
CVE-2020-12668 is a security vulnerability in Jinjava involving Unauthorized access to Class instance in Jinjava under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Jinjava versions are affected?
Affected versions include releases prior to 2.5.4 across affected packages: com.hubspot.jinjava:jinjava.
What version fixes CVE-2020-12668?
Upgrading to 2.5.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is jinjava affected?
Yes, com.hubspot.jinjava:jinjava is affected in releases prior to 2.5.4. Upgrade your dependency to 2.5.4 or later.
What is the CVSS score of CVE-2020-12668?
CVE-2020-12668 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-2020-12668?
CVE-2020-12668 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check Maven dependencies for CVE-2020-12668?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=com.hubspot.jinjava'. 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-2hjr-fg6c-v2h6",
  "modified" : "2021-03-29T22:59:44Z",
  "published" : "2022-02-09T00:33:56Z",
  "aliases" : [ "CVE-2020-12668" ],
  "summary" : "Unauthorized access to Class instance in Jinjava",
  "details" : "Jinjava before 2.5.4 allow access to arbitrary classes by calling Java methods on objects passed into a Jinjava context. This could allow for abuse of the application class loader, including Arbitrary File Disclosure.",
  "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" : "com.hubspot.jinjava:jinjava"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.5.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-12668"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HubSpot/jinjava/pull/426/commits/5dfa5b87318744a4d020b66d5f7747acc36b213b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HubSpot/jinjava/pull/435/commits/1b9aaa4b420c58b4a301cf4b7d26207f1c8d1165"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HubSpot/jinjava/compare/jinjava-2.5.3...jinjava-2.5.4"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/HubSpot/jinjava/releases/tag/jinjava-2.5.4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://securitylab.github.com/advisories/GHSL-2020-072-hubspot_jinjava"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-29T22:59:44Z",
    "nvd_published_at" : "2021-02-19T23:15:00Z"
  }
}