CVE-2021-43840
Assigner: GitHub_M
Published: 2021-12-17T18:15:11
State: PUBLISHED
affected: product: message_bus
vendor: discourse
versions: status: affected
version: < 3.3.7
descriptions: value: message_bus is a messaging bus for Ruby processes and web clients. In versions prior to 3.3.7 users who deployed message bus with diagnostics features enabled (default off) are vulnerable to a path traversal bug, which could lead to disclosure of secret information on a machine if an unintended user were to gain access to the diagnostic route. The impact is also greater if there is no proxy for your web application as the number of steps up the directories is not bounded. For deployments which uses a proxy, the impact varies. For example, If a request goes through a proxy like Nginx with `merge_slashes` enabled, the number of steps up the directories that can be read is limited to 3 levels. This issue has been patched in version 3.3.7. Users unable to upgrade should ensure that MessageBus::Diagnostics is disabled.
metrics: cvssV3_1: attackComplexity: HIGH
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 4.4
baseSeverity: MEDIUM
confidentialityImpact: HIGH
integrityImpact: NONE
privilegesRequired: HIGH
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N
version: 3.1
problemTypes: descriptions: cweId: CWE-22
description: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
type: CWE
source: advisory: GHSA-xmgj-5fh3-xjmm
discovery: UNKNOWN
title: Path traversal in message_bus