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Drupal core access bypass vulnerability

Moderate severity GitHub Reviewed Published May 13, 2022 to the GitHub Advisory Database • Updated Apr 23, 2024

Package

composer drupal/core (Composer)

Affected versions

>= 7.0, < 7.56
>= 8.0, < 8.3.4

Patched versions

7.56
8.3.4
composer drupal/drupal (Composer)
>= 8.0, < 8.3.4
>= 7.0, < 7.56
8.3.4
7.56

Description

In Drupal core 8.x prior to 8.3.4 and Drupal core 7.x prior to 7.56; Private files that have been uploaded by an anonymous user but not permanently attached to content on the site should only be visible to the anonymous user that uploaded them, rather than all anonymous users. Drupal core did not previously provide this protection, allowing an access bypass vulnerability to occur. This issue is mitigated by the fact that in order to be affected, the site must allow anonymous users to upload files into a private file system.

References

Published by the National Vulnerability Database Jan 22, 2019
Published to the GitHub Advisory Database May 13, 2022
Reviewed Apr 23, 2024
Last updated Apr 23, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.334%
(72nd percentile)

Weaknesses

CVE ID

CVE-2017-6922

GHSA ID

GHSA-58f3-cx8p-h8jg

Source code

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