Lucene search

[email protected]CVE-2021-43840

HistoryDec 17, 2021 - 7:15 p.m.

CVE-2021-43840

2021-12-1719:15:07

CWE-22

[email protected]

web.nvd.nist.gov

cve-2021-43840

message_bus

ruby

path traversal

disclosure

vulnerability

nvd

3.5 Low

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:M/Au:S/C:P/I:N/A:N

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

6.4 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

30.8%

JSON

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.

Affected configurations

Vulners

NVD

Node

discoursemessage_busRange<3.3.7

VendorProductVersionCPE
discoursemessage_bus*cpe:2.3:a:discourse:message_bus:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
discourse	message_bus	*	cpe:2.3:a:discourse:message_bus::::::::

CNA Affected

[
  {
    "product": "message_bus",
    "vendor": "discourse",
    "versions": [
      {
        "status": "affected",
        "version": "< 3.3.7"
      }
    ]
  }
]