CVE-2017-6926: Drupal/core Drupal Comment Reply Form Allows Vulnerability

HIGH
Advisory Identifier: GHSA-2p28-5mvp-2j2r
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CVSS 8.1
CWE-200
Published
Advisory Summary

CVE-2017-6926 is a HIGH (CVSS 8.1) drupal comment reply form allows vulnerability (CWE-200: Exposure of Sensitive Information to an Unauthorized Actor) affecting Drupal/core libraries in the Packagist ecosystem. The issue involves drupal comment reply form allows access to restricted content. Remediation is available by upgrading affected packages to version 8.4.5, 7.57.

CVE-2017-6926 at a Glance

CVE Identifier CVE-2017-6926
GHSA Identifier GHSA-2p28-5mvp-2j2r
Severity HIGH
CVSS v3.1 Base Score 8.1
CWE Classification CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
Affected Product Drupal/core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N).

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 None (A:N)

How to Fix CVE-2017-6926

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

drupal/core fixed: 8.4.5 
Upgrade drupal/core to 8.4.5
drupal/core fixed: 7.57 
Upgrade drupal/core to 7.57
drupal/drupal fixed: 8.4.5 
Upgrade drupal/drupal to 8.4.5
drupal/drupal fixed: 7.57 
Upgrade drupal/drupal to 7.57
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 drupal/core

How to Check if You Are Affected

To determine whether your application is affected by CVE-2017-6926, inspect your project dependencies for Drupal/core:

inspect dependencies for drupal/core

Analyze the terminal output to locate any version of Drupal/core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 8.4.5), 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-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 Drupal/core, 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 Drupal versions 8.4.x versions before 8.4.5 users with permission to post comments are able to view content and comments they do not have access to, and are also able to add comments to this content. This vulnerability is mitigated by the fact that the comment system must be enabled and the attacker must have permission to post comments.

CVE-2017-6926 Affected Drupal/core Versions

4 component(s)
Fixed Versions:
8.4.57.57
Product / Package Ecosystem Affected Versions Fixed Version
drupal/core
 Packagist
≥ 8.4.0
< 8.4.5
8.4.5
drupal/core
 Packagist
≥ 7.0
< 7.57
7.57
drupal/drupal
 Packagist
≥ 8.4.0
< 8.4.5
8.4.5
drupal/drupal
 Packagist
≥ 7.0
< 7.57
7.57

References

NVD — CVE-2017-6926 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-6926
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6926.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6926.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/drupal/core
www.drupal.org/sa-core-2018-001 WEB
https://www.drupal.org/sa-core-2018-001

Frequently Asked Questions

What is CVE-2017-6926?
CVE-2017-6926 is a security vulnerability in Drupal/core involving Drupal Comment reply form allows access to restricted content under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.
Which Drupal/core versions are affected?
Affected versions include releases prior to 8.4.5, 7.57 across affected packages: drupal/core, drupal/drupal.
What version fixes CVE-2017-6926?
Upgrading to 8.4.5, 7.57 (or the latest patched release for your respective branch) resolves the vulnerability.
Is drupal/core affected?
Yes, drupal/core is affected in releases prior to 8.4.5, 7.57. Upgrade your dependency to 8.4.5, 7.57 or later.
Is drupal/drupal affected?
Yes, drupal/drupal is affected in releases prior to 8.4.5, 7.57. Upgrade your dependency to 8.4.5, 7.57 or later.
What is the CVSS score of CVE-2017-6926?
CVE-2017-6926 has a CVSS v3.1 base score of 8.1 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2017-6926?
CVE-2017-6926 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 Packagist dependencies for CVE-2017-6926?
Run the dependency tree command: 'inspect dependencies for drupal/core'. 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-2p28-5mvp-2j2r",
  "modified" : "2024-04-23T22:36:48Z",
  "published" : "2022-05-14T03:35:57Z",
  "aliases" : [ "CVE-2017-6926" ],
  "summary" : "Drupal Comment reply form allows access to restricted content",
  "details" : "In Drupal versions 8.4.x versions before 8.4.5 users with permission to post comments are able to view content and comments they do not have access to, and are also able to add comments to this content. This vulnerability is mitigated by the fact that the comment system must be enabled and the attacker must have permission to post comments.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.4.0"
      }, {
        "fixed" : "8.4.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0"
      }, {
        "fixed" : "7.57"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.4.0"
      }, {
        "fixed" : "8.4.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "drupal/drupal"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0"
      }, {
        "fixed" : "7.57"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-6926"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6926.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6926.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/drupal/core"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2018-001"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-200" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T22:36:48Z",
    "nvd_published_at" : "2018-03-01T23:29:00Z"
  }
}