CVE-2021-31274: Librenms/librenms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-2r2w-jrh2-p4gr
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CVSS 5.4
CWE-79
Published
Advisory Summary

CVE-2021-31274 is a MODERATE (CVSS 5.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Librenms/librenms libraries in the Packagist ecosystem. The issue involves cross-site scripting in librenms. Remediation is available by upgrading affected packages to version 21.3.0.

CVE-2021-31274 at a Glance

CVE Identifier CVE-2021-31274
GHSA Identifier GHSA-2r2w-jrh2-p4gr
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Librenms/librenms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.4

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:R/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
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-2021-31274

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

librenms/librenms fixed: 21.3.0 
Upgrade librenms/librenms to 21.3.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for librenms/librenms

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-31274, inspect your project dependencies for Librenms/librenms:

inspect dependencies for librenms/librenms

Analyze the terminal output to locate any version of Librenms/librenms in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 21.3.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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 Librenms/librenms, 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

In LibreNMS < 21.3.0, a stored XSS vulnerability was identified in the API Access page due to insufficient sanitization of the $api->description variable. As a result, arbitrary Javascript code can get executed.

CVE-2021-31274 Affected Librenms/librenms Versions

1 component(s)
Fixed Versions:
21.3.0
Product / Package Ecosystem Affected Versions Fixed Version
librenms/librenms
 Packagist
< 21.3.0
21.3.0

References

NVD — CVE-2021-31274 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31274
Librenms/librenms Source Repository REPOSITORY
https://github.com/librenms/librenms/pull/12739
community.librenms.org/t/vulnerability-rep... WEB
https://community.librenms.org/t/vulnerability-report-cross-site-scripting-xss-in-the-api-access-page/15431
Librenms/librenms Source Repository REPOSITORY
https://github.com/librenms/librenms

Frequently Asked Questions

What is CVE-2021-31274?
CVE-2021-31274 is a security vulnerability in Librenms/librenms involving Cross-site Scripting in LibreNMS under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Librenms/librenms versions are affected?
Affected versions include releases prior to 21.3.0 across affected packages: librenms/librenms.
What version fixes CVE-2021-31274?
Upgrading to 21.3.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is librenms/librenms affected?
Yes, librenms/librenms is affected in releases prior to 21.3.0. Upgrade your dependency to 21.3.0 or later.
What is the CVSS score of CVE-2021-31274?
CVE-2021-31274 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-31274?
CVE-2021-31274 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 Packagist dependencies for CVE-2021-31274?
Run the dependency tree command: 'inspect dependencies for librenms/librenms'. 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-2r2w-jrh2-p4gr",
  "modified" : "2023-09-19T10:09:11Z",
  "published" : "2021-09-09T17:08:55Z",
  "aliases" : [ "CVE-2021-31274" ],
  "summary" : "Cross-site Scripting in LibreNMS",
  "details" : "In LibreNMS < 21.3.0, a stored XSS vulnerability was identified in the API Access page due to insufficient sanitization of the $api->description variable. As a result, arbitrary Javascript code can get executed.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "librenms/librenms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "21.3.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31274"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/librenms/librenms/pull/12739"
  }, {
    "type" : "WEB",
    "url" : "https://community.librenms.org/t/vulnerability-report-cross-site-scripting-xss-in-the-api-access-page/15431"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/librenms/librenms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-09-09T13:32:48Z",
    "nvd_published_at" : "2021-09-08T18:15:00Z"
  }
}