CVE-2018-21019: Homeassistant Home Assistant Information Disclosure Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-mh78-8f49-vjg3
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CVSS 7.5
CWE-200
Published
Advisory Summary

CVE-2018-21019 is a HIGH (CVSS 7.5) home assistant information disclosure vulnerability vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Homeassistant libraries in the PyPI ecosystem. The issue involves home assistant information disclosure vulnerability. Remediation is available by upgrading affected packages to version 0.67.0.

CVE-2018-21019 at a Glance

CVE Identifier CVE-2018-21019
GHSA Identifier GHSA-mh78-8f49-vjg3
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Homeassistant
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:N/S:U/C:H/I:N/A:N).

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

How to Fix CVE-2018-21019

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

homeassistant fixed: 0.67.0 
pip install homeassistant>=0.67.0
Verify Direct and Transitive Dependencies

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

pip show homeassistant

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2018-21019, inspect your installed packages using pip:

pip show homeassistant

Analyze the terminal output to locate any version of Homeassistant in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.67.0), your application is affected.

Note: The pip show homeassistant command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor, where the product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. In Homeassistant, 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

Home Assistant before 0.67.0 was vulnerable to an information disclosure that allowed an unauthenticated attacker to read the application's error log via components/api.py.

CVE-2018-21019 Affected Homeassistant Versions

1 component(s)
Fixed Versions:
0.67.0
Product / Package Ecosystem Affected Versions Fixed Version
homeassistant
pypi/homeassistant
PyPI
< 0.67.0
0.67.0

References

NVD — CVE-2018-21019 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-21019
Homeassistant Source Repository REPOSITORY
https://github.com/home-assistant/core/pull/13836
Homeassistant Source Repository REPOSITORY
https://github.com/home-assistant/home-assistant/pull/13836
Security Fix Commit FIX COMMIT
https://github.com/home-assistant/core/commit/598f093bf0fecdefaa3d95d1ddae71317a05321e
Homeassistant Source Repository REPOSITORY
https://github.com/home-assistant/core
Homeassistant Release RELEASE
https://github.com/home-assistant/core/releases/tag/0.67.0
Homeassistant Release RELEASE
https://github.com/home-assistant/home-assistant/releases/tag/0.67.0
Homeassistant Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/homeassistant/PYSEC-2019-221.yaml

Frequently Asked Questions

What is CVE-2018-21019?
CVE-2018-21019 is a security vulnerability in Homeassistant involving Home Assistant information disclosure vulnerability under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Homeassistant versions are affected?
Affected versions include releases prior to 0.67.0 across affected packages: homeassistant.
What version fixes CVE-2018-21019?
Upgrading to 0.67.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is homeassistant affected?
Yes, homeassistant is affected in releases prior to 0.67.0. Upgrade your dependency to 0.67.0 or later.
What is the CVSS score of CVE-2018-21019?
CVE-2018-21019 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2018-21019?
CVE-2018-21019 is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.).
How can I check PyPI dependencies for CVE-2018-21019?
Run the dependency tree command: 'pip show homeassistant'. 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-mh78-8f49-vjg3",
  "modified" : "2024-09-20T21:20:38Z",
  "published" : "2022-05-24T16:56:39Z",
  "aliases" : [ "CVE-2018-21019" ],
  "summary" : "Home Assistant information disclosure vulnerability",
  "details" : "Home Assistant before 0.67.0 was vulnerable to an information disclosure that allowed an unauthenticated attacker to read the application's error log via components/api.py.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "homeassistant"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.67.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-21019"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/pull/13836"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/home-assistant/pull/13836"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/commit/598f093bf0fecdefaa3d95d1ddae71317a05321e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/home-assistant/core"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/core/releases/tag/0.67.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/home-assistant/home-assistant/releases/tag/0.67.0"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/homeassistant/PYSEC-2019-221.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-29T09:52:27Z",
    "nvd_published_at" : "2019-09-23T16:15:00Z"
  }
}