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Drupal Brute force amplification attacks via XML-RPC

High severity GitHub Reviewed Published May 17, 2022 to the GitHub Advisory Database • Updated May 3, 2024

Package

composer drupal/core (Composer)

Affected versions

>= 7.0, < 7.43
>= 6.0, < 6.38

Patched versions

7.43
6.38
composer drupal/drupal (Composer)
>= 7.0, < 7.43
>= 6.0, < 6.38
7.43
6.38

Description

The XML-RPC system in Drupal 6.x before 6.38 and 7.x before 7.43 might make it easier for remote attackers to conduct brute-force attacks via a large number of calls made at once to the same method.

References

Published by the National Vulnerability Database Apr 12, 2016
Published to the GitHub Advisory Database May 17, 2022
Reviewed Apr 23, 2024
Last updated May 3, 2024

Severity

High

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
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
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:N/UI:N/S:U/C:N/I:H/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(59th percentile)

Weaknesses

No CWEs

CVE ID

CVE-2016-3163

GHSA ID

GHSA-h3r9-pjmr-f938

Source code

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