CVE-2021-44279: Librenms/librenms Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-5vr6-hm68-5j9p
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2021-44279 is a MODERATE (CVSS 6.1) 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 in the latest vendor maintenance releases.

CVE-2021-44279 at a Glance

CVE Identifier CVE-2021-44279
GHSA Identifier GHSA-5vr6-hm68-5j9p
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 Librenms/librenms
Package Ecosystem Packagist
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-2021-44279

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: Latest secure release 
Upgrade librenms/librenms to Latest secure release
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-2021-44279, 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 the patched release), 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

LibreNMS 21.11.0 is affected by is affected by a Cross Site Scripting (XSS) vulnerability in includes/html/forms/poller-groups.inc.php.

CVE-2021-44279 Affected Librenms/librenms Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
librenms/librenms
 Packagist
≤ 21.11.0

References

NVD — CVE-2021-44279 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-44279
Librenms/librenms Source Repository REPOSITORY
https://github.com/librenms/librenms/pull/13554
Librenms/librenms Source Repository REPOSITORY
https://github.com/librenms/librenms/pull/13554/commits/4f231a0f49b6c953d506913364ffd7fb3a660630
Librenms/librenms Source Repository REPOSITORY
https://github.com/librenms/librenms

Frequently Asked Questions

What is CVE-2021-44279?
CVE-2021-44279 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 current release patches across affected packages: librenms/librenms.
What version fixes CVE-2021-44279?
Upgrading to current release patches (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 Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2021-44279?
CVE-2021-44279 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-2021-44279?
CVE-2021-44279 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-2021-44279?
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-5vr6-hm68-5j9p",
  "modified" : "2021-12-06T21:36:37Z",
  "published" : "2021-12-03T20:49:16Z",
  "aliases" : [ "CVE-2021-44279" ],
  "summary" : "Cross-site Scripting in LibreNMS",
  "details" : "LibreNMS 21.11.0 is affected by is affected by a Cross Site Scripting (XSS) vulnerability in includes/html/forms/poller-groups.inc.php.",
  "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" : "Packagist",
      "name" : "librenms/librenms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "21.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-44279"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/librenms/librenms/pull/13554"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/librenms/librenms/pull/13554/commits/4f231a0f49b6c953d506913364ffd7fb3a660630"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/librenms/librenms"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-02T18:54:26Z",
    "nvd_published_at" : "2021-12-01T14:15:00Z"
  }
}