CVE-2020-2247: Klocwork XXE Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-p6c5-737r-2r93
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CVSS 7.1
CWE-611
Published
Advisory Summary

CVE-2020-2247 is a HIGH (CVSS 7.1) xxe vulnerability vulnerability (CWE-611: Improper Restriction of XML External Entity Reference) affecting Klocwork libraries in the Maven ecosystem. The issue involves xxe vulnerability in jenkins klocwork analysis plugin. Remediation is available by upgrading affected packages to version 2020.3.1.

CVE-2020-2247 at a Glance

CVE Identifier CVE-2020-2247
GHSA Identifier GHSA-p6c5-737r-2r93
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-611: Improper Restriction of XML External Entity Reference
Affected Product Klocwork
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 7.1

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:L/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 Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-2247

To remediate this vulnerability, upgrade all affected Klocwork 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.jenkins-ci.plugins:klocwork fixed: 2020.3.1 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>klocwork</artifactId>
    <version>2020.3.1</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.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-2247, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Klocwork in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2020.3.1), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins 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 Klocwork, 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

Klocwork Analysis Plugin 2020.2.1 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks. This allows a user able to control the input files for the Klocwork plugin parser to have Jenkins parse a crafted file that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.

CVE-2020-2247 Affected Klocwork Versions

1 component(s)
Fixed Versions:
2020.3.1
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:klocwork
maven/org.jenkins-ci.plugins/klocwork
Maven
< 2020.3.1
2020.3.1

References

NVD — CVE-2020-2247 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2247
Klocwork Source Repository REPOSITORY
https://github.com/jenkinsci/klocwork-plugin
Klocwork Security Information SECURITY
https://jenkins.io/security/advisory/2020-09-01/#SECURITY-1831
Klocwork Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/09/01/3

Frequently Asked Questions

What is CVE-2020-2247?
CVE-2020-2247 is a security vulnerability in Klocwork involving XXE vulnerability in Jenkins Klocwork Analysis Plugin under CWE-611: Improper Restriction of XML External Entity Reference.
Which Klocwork versions are affected?
Affected versions include releases prior to 2020.3.1 across affected packages: org.jenkins-ci.plugins:klocwork.
What version fixes CVE-2020-2247?
Upgrading to 2020.3.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is klocwork affected?
Yes, org.jenkins-ci.plugins:klocwork is affected in releases prior to 2020.3.1. Upgrade your dependency to 2020.3.1 or later.
What is the CVSS score of CVE-2020-2247?
CVE-2020-2247 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2020-2247?
CVE-2020-2247 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-2020-2247?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. 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-p6c5-737r-2r93",
  "modified" : "2022-12-20T22:39:05Z",
  "published" : "2022-05-24T17:27:07Z",
  "aliases" : [ "CVE-2020-2247" ],
  "summary" : "XXE vulnerability in Jenkins Klocwork Analysis Plugin",
  "details" : "Klocwork Analysis Plugin 2020.2.1 and earlier does not configure its XML parser to prevent XML external entity (XXE) attacks.\n\nThis allows a user able to control the input files for the Klocwork plugin parser to have Jenkins parse a crafted file that uses external entities for extraction of secrets from the Jenkins controller or server-side request forgery.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:klocwork"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2020.3.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2020.2.1"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2247"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/klocwork-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-09-01/#SECURITY-1831"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/09/01/3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-611" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-20T22:39:05Z",
    "nvd_published_at" : "2020-09-01T14:15:00Z"
  }
}