CVE-2020-1933: Nifi Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-pqhq-xx62-2v2p
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-1933 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Nifi libraries in the Maven ecosystem. The issue involves cross-site scripting in apache nifi. Remediation is available by upgrading affected packages to version 1.11.0.

CVE-2020-1933 at a Glance

CVE Identifier CVE-2020-1933
GHSA Identifier GHSA-pqhq-xx62-2v2p
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 Nifi
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-2020-1933

To remediate this vulnerability, upgrade all affected Nifi 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.apache.nifi:nifi fixed: 1.11.0 
<dependency>
    <groupId>org.apache.nifi</groupId>
    <artifactId>nifi</artifactId>
    <version>1.11.0</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.apache.nifi

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2020-1933, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.nifi

Analyze the terminal output to locate any version of Nifi in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.11.0), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.nifi 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 Nifi, 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

A XSS vulnerability was found in Apache NiFi 1.0.0 to 1.10.0. Malicious scripts could be injected to the UI through action by an unaware authenticated user in Firefox. Did not appear to occur in other browsers.

CVE-2020-1933 Affected Nifi Versions

1 component(s)
Fixed Versions:
1.11.0
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.nifi:nifi
maven/org.apache.nifi/nifi
Maven
≥ 1.0.0
< 1.11.0
1.11.0

References

Nifi Security Information SECURITY
https://nifi.apache.org/security.html#CVE-2020-1933
NVD — CVE-2020-1933 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-1933
Nifi Source Repository REPOSITORY
https://github.com/apache/nifi/pull/3991

Frequently Asked Questions

What is CVE-2020-1933?
CVE-2020-1933 is a security vulnerability in Nifi involving Cross-site scripting in Apache NiFi under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Nifi versions are affected?
Affected versions include releases prior to 1.11.0 across affected packages: org.apache.nifi:nifi.
What version fixes CVE-2020-1933?
Upgrading to 1.11.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is nifi affected?
Yes, org.apache.nifi:nifi is affected in releases prior to 1.11.0. Upgrade your dependency to 1.11.0 or later.
What is the CVSS score of CVE-2020-1933?
CVE-2020-1933 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-2020-1933?
CVE-2020-1933 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-2020-1933?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.nifi'. 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-pqhq-xx62-2v2p",
  "modified" : "2021-03-26T22:28:03Z",
  "published" : "2022-01-06T20:35:39Z",
  "aliases" : [ "CVE-2020-1933" ],
  "summary" : "Cross-site scripting in Apache NiFi",
  "details" : "A XSS vulnerability was found in Apache NiFi 1.0.0 to 1.10.0. Malicious scripts could be injected to the UI through action by an unaware authenticated user in Firefox. Did not appear to occur in other browsers.",
  "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.apache.nifi:nifi"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.11.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.10.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-1933"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/nifi/pull/3991"
  }, {
    "type" : "WEB",
    "url" : "https://nifi.apache.org/security.html#CVE-2020-1933"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-03-26T22:28:03Z",
    "nvd_published_at" : "2020-01-28T01:15:00Z"
  }
}