CVE-2017-6928: Drupal/core Drupal Access Bypass Vulnerability Vulnerability

MODERATE
Advisory Identifier: GHSA-66mv-q8r2-hj8w
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CVSS 5.3
CWE-732
Published
Advisory Summary

CVE-2017-6928 is a MODERATE (CVSS 5.3) drupal access bypass vulnerability vulnerability (CWE-732: Incorrect Permission Assignment for Critical Resource) affecting Drupal/core libraries in the Packagist ecosystem. The issue involves drupal access bypass vulnerability. Remediation is available by upgrading affected packages to version 7.57.

CVE-2017-6928 at a Glance

CVE Identifier CVE-2017-6928
GHSA Identifier GHSA-66mv-q8r2-hj8w
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-732: Incorrect Permission Assignment for Critical Resource
Affected Product Drupal/core
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
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-2017-6928

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: 7.57 
Upgrade drupal/core to 7.57
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-2017-6928, 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 7.57), 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-732: Incorrect Permission Assignment for Critical Resource, where the product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. 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

Drupal core 7.x versions before 7.57 when using Drupal's private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module is trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability. This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.

CVE-2017-6928 Affected Drupal/core Versions

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

References

NVD — CVE-2017-6928 NVD
https://nvd.nist.gov/vuln/detail/CVE-2017-6928
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6928.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6928.yaml
Drupal/core Source Repository REPOSITORY
https://github.com/drupal/core
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2018/02/msg00030.html
Drupal/core Security Information SECURITY
https://www.debian.org/security/2018/dsa-4123
www.drupal.org/sa-core-2018-001 WEB
https://www.drupal.org/sa-core-2018-001

Frequently Asked Questions

What is CVE-2017-6928?
CVE-2017-6928 is a security vulnerability in Drupal/core involving Drupal access bypass vulnerability under CWE-732: Incorrect Permission Assignment for Critical Resource.
Which Drupal/core versions are affected?
Affected versions include releases prior to 7.57 across affected packages: drupal/core, drupal/drupal.
What version fixes CVE-2017-6928?
Upgrading to 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 7.57. Upgrade your dependency to 7.57 or later.
Is drupal/drupal affected?
Yes, drupal/drupal is affected in releases prior to 7.57. Upgrade your dependency to 7.57 or later.
What is the CVSS score of CVE-2017-6928?
CVE-2017-6928 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2017-6928?
CVE-2017-6928 is classified under CWE-732: Incorrect Permission Assignment for Critical Resource (The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.).
How can I check Packagist dependencies for CVE-2017-6928?
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-66mv-q8r2-hj8w",
  "modified" : "2024-04-23T22:34:12Z",
  "published" : "2022-05-13T01:46:48Z",
  "aliases" : [ "CVE-2017-6928" ],
  "summary" : "Drupal access bypass vulnerability",
  "details" : "Drupal core 7.x versions before 7.57 when using Drupal's private file system, Drupal will check to make sure a user has access to a file before allowing the user to view or download it. This check fails under certain conditions in which one module is trying to grant access to the file and another is trying to deny it, leading to an access bypass vulnerability. This vulnerability is mitigated by the fact that it only occurs for unusual site configurations.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "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" : "7.0"
      }, {
        "fixed" : "7.57"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2017-6928"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6928.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6928.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/drupal/core"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2018/02/msg00030.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2018/dsa-4123"
  }, {
    "type" : "WEB",
    "url" : "https://www.drupal.org/sa-core-2018-001"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-732" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-23T22:34:12Z",
    "nvd_published_at" : "2018-03-01T23:29:00Z"
  }
}