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[email protected]CVE-2021-22969

HistoryNov 19, 2021 - 7:15 p.m.

CVE-2021-22969

2021-11-1919:15:08

CWE-918

[email protected]

web.nvd.nist.gov

cve

2021

22969

concrete cms

concrete5

ssrf

dns rebind

cloud

iaas

aws

iam

security

vulnerability

mitigation

cvss 3.1

fortbridge

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:N/AC:L/Au:N/C:P/I:N/A:N

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

5.5 Medium

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

32.2%

JSON

Concrete CMS (formerly concrete5) versions below 8.5.7 has a SSRF mitigation bypass using DNS Rebind attack giving an attacker the ability to fetch cloud IAAS (ex AWS) IAM keys.To fix this Concrete CMS no longer allows downloads from the local network and specifies the validated IP when downloading rather than relying on DNS.Discoverer: Adrian Tiron from FORTBRIDGE ( https://www.fortbridge.co.uk/ )The Concrete CMS team gave this a CVSS 3.1 score of 3.5 AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N . Please note that Cloud IAAS provider mis-configurations are not Concrete CMS vulnerabilities. A mitigation for this vulnerability is to make sure that the IMDS configurations are according to a cloud provider’s best practices.This fix is also in Concrete version 9.0.0

Affected configurations

NVD

Node

concretecmsconcrete_cmsRange<8.5.7

CPENameOperatorVersion
concretecms:concrete_cmsconcretecms concrete cmslt8.5.7

CPE	Name	Operator	Version
concretecms:concrete_cms	concretecms concrete cms	lt	8.5.7

CNA Affected

[
  {
    "product": "https://github.com/concrete5/concrete5",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "Affected version Concrete CMS (concrete5) 8.5.6 and below. Fixed in Concrete CMS version 8.5.7 and 9.0.0"
      }
    ]
  }
]