CVE-2019-12463: Librenms/librenms Improper Encoding Or Escaping Of Vulnerability

HIGH
Advisory Identifier: GHSA-w5r2-gvgf-mpm8
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CVSS 8.8
CWE-116 CWE-74
Published
Advisory Summary

CVE-2019-12463 is a HIGH (CVSS 8.8) improper encoding or escaping of vulnerability (CWE-116: Improper Encoding or Escaping of Output) affecting Librenms/librenms libraries in the Packagist ecosystem. The issue involves improper encoding or escaping of output and injection in librenms. Remediation is available by upgrading affected packages to version 1.53.

CVE-2019-12463 at a Glance

CVE Identifier CVE-2019-12463
GHSA Identifier GHSA-w5r2-gvgf-mpm8
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-116: Improper Encoding or Escaping of Output
Affected Product Librenms/librenms
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:H/A:H).

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 High (I:H)
Availability High (A:H)

How to Fix CVE-2019-12463

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: 1.53 
Upgrade librenms/librenms to 1.53
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-2019-12463, 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 1.53), 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-116: Improper Encoding or Escaping of Output, where the product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. as a result, the intended structure of the message is not preserved. 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

An issue was discovered in LibreNMS 1.50.1. The scripts that handle graphing options (includes/html/graphs/common.inc.php and includes/html/graphs/graphs.inc.php) do not sufficiently validate or encode several fields of user supplied input. Some parameters are filtered with mysqli_real_escape_string, which is only useful for preventing SQL injection attacks; other parameters are unfiltered. This allows an attacker to inject RRDtool syntax with newline characters via the html/graph.php and html/graph-realtime.php scripts. RRDtool syntax is quite versatile and an attacker could leverage this to perform a number of attacks, including disclosing directory structure and filenames, disclosing file content, denial of service, or writing arbitrary files. NOTE, relative to CVE-2019-10665, this requires authentication and the pathnames differ.

CVE-2019-12463 Affected Librenms/librenms Versions

1 component(s)
Fixed Versions:
1.53
Product / Package Ecosystem Affected Versions Fixed Version
librenms/librenms
 Packagist
≥ 1.50.1
< 1.53
1.53

References

NVD — CVE-2019-12463 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-12463
www.darkmatter.ae/xen1thlabs/librenms... WEB
https://www.darkmatter.ae/xen1thlabs/librenms-rrdtool-injection-vulnerability-xl-19-022

Frequently Asked Questions

What is CVE-2019-12463?
CVE-2019-12463 is a security vulnerability in Librenms/librenms involving Improper Encoding or Escaping of Output and Injection in LibreNMS under CWE-116: Improper Encoding or Escaping of Output.
Which Librenms/librenms versions are affected?
Affected versions include releases prior to 1.53 across affected packages: librenms/librenms.
What version fixes CVE-2019-12463?
Upgrading to 1.53 (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 1.53. Upgrade your dependency to 1.53 or later.
What is the CVSS score of CVE-2019-12463?
CVE-2019-12463 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2019-12463?
CVE-2019-12463 is classified under CWE-116: Improper Encoding or Escaping of Output (The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.).
How can I check Packagist dependencies for CVE-2019-12463?
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-w5r2-gvgf-mpm8",
  "modified" : "2021-05-11T14:41:55Z",
  "published" : "2019-10-11T18:43:13Z",
  "aliases" : [ "CVE-2019-12463" ],
  "summary" : "Improper Encoding or Escaping of Output and Injection in LibreNMS",
  "details" : "An issue was discovered in LibreNMS 1.50.1. The scripts that handle graphing options (includes/html/graphs/common.inc.php and includes/html/graphs/graphs.inc.php) do not sufficiently validate or encode several fields of user supplied input. Some parameters are filtered with mysqli_real_escape_string, which is only useful for preventing SQL injection attacks; other parameters are unfiltered. This allows an attacker to inject RRDtool syntax with newline characters via the html/graph.php and html/graph-realtime.php scripts. RRDtool syntax is quite versatile and an attacker could leverage this to perform a number of attacks, including disclosing directory structure and filenames, disclosing file content, denial of service, or writing arbitrary files. NOTE, relative to CVE-2019-10665, this requires authentication and the pathnames differ.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "librenms/librenms"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.50.1"
      }, {
        "fixed" : "1.53"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-12463"
  }, {
    "type" : "WEB",
    "url" : "https://www.darkmatter.ae/xen1thlabs/librenms-rrdtool-injection-vulnerability-xl-19-022"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-116", "CWE-74" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-09-25T12:52:31Z",
    "nvd_published_at" : "2019-09-09T14:15:00Z"
  }
}