Vulnerabilities in pkg:maven/org.jenkins-ci.plugins/vncviewer

PACKAGE
Advisory Identifier: GHSA-2j4h-cjgh-659v
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Advisory Summary

CVE-2020-2207 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Vncviewer libraries in the Maven ecosystem. The issue involves reflected xss vulnerability in jenkins vncviewer plugin. Remediation is available by upgrading affected packages to version 1.8.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:maven/org.jenkins-ci.plugins/vncviewer

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:maven/org.jenkins-ci.plugins/vncviewer. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-2j4h-cjgh-659v CVE-2020-2207 MODERATE Reflected XSS vulnerability in Jenkins VncViewer Plugin

CVE-2020-2207 at a Glance

CVE Identifier CVE-2020-2207
GHSA Identifier GHSA-2j4h-cjgh-659v
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Vncviewer
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.1

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

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

How to Fix CVE-2020-2207

To remediate this vulnerability, upgrade all affected Vncviewer 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:vncviewer fixed: 1.8 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>vncviewer</artifactId>
    <version>1.8</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-2020-2207, 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 Vncviewer in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.8), 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-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 Vncviewer, 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

VncViewer Plugin 1.7 and earlier does not escape a parameter value in the `checkVncServ` form validation endpoint output. This results in a reflected cross-site scripting (XSS) vulnerability. VncViewer Plugin 1.8 escapes the parameter value in the output.

CVE-2020-2207 Affected Vncviewer Versions

1 component(s)
Fixed Versions:
1.8
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:vncviewer
maven/org.jenkins-ci.plugins/vncviewer
Maven
< 1.8
1.8

References

NVD — CVE-2020-2207 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-2207
Security Fix Commit FIX COMMIT
https://github.com/jenkinsci/vncviewer-plugin/commit/99b2aa3ed0857ef35de9a3aca0b0c53add3b392d
Vncviewer Source Repository REPOSITORY
https://github.com/jenkinsci/vncviewer-plugin
Vncviewer Security Information SECURITY
https://jenkins.io/security/advisory/2020-07-02/#SECURITY-1776
Vncviewer Security Information SECURITY
http://www.openwall.com/lists/oss-security/2020/07/02/7

Frequently Asked Questions

What is CVE-2020-2207?
CVE-2020-2207 is a security vulnerability in Vncviewer involving Reflected XSS vulnerability in Jenkins VncViewer Plugin under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Vncviewer versions are affected?
Affected versions include releases prior to 1.8 across affected packages: org.jenkins-ci.plugins:vncviewer.
What version fixes CVE-2020-2207?
Upgrading to 1.8 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vncviewer affected?
Yes, org.jenkins-ci.plugins:vncviewer is affected in releases prior to 1.8. Upgrade your dependency to 1.8 or later.
What is the CVSS score of CVE-2020-2207?
CVE-2020-2207 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-2207?
CVE-2020-2207 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-2020-2207?
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-2j4h-cjgh-659v",
  "modified" : "2022-12-29T00:27:48Z",
  "published" : "2022-05-24T17:22:19Z",
  "aliases" : [ "CVE-2020-2207" ],
  "summary" : "Reflected XSS vulnerability in Jenkins VncViewer Plugin",
  "details" : "VncViewer Plugin 1.7 and earlier does not escape a parameter value in the `checkVncServ` form validation endpoint output.\n\nThis results in a reflected cross-site scripting (XSS) vulnerability.\n\nVncViewer Plugin 1.8 escapes the parameter value in the output.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:vncviewer"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.8"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.7"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-2207"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/jenkinsci/vncviewer-plugin/commit/99b2aa3ed0857ef35de9a3aca0b0c53add3b392d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/vncviewer-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://jenkins.io/security/advisory/2020-07-02/#SECURITY-1776"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2020/07/02/7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-12-29T00:27:48Z",
    "nvd_published_at" : "2020-07-02T15:15:00Z"
  }
}