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VULNERABILITIES

CVE-2021-22969 Details

Description

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

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes CVERelease NotesVendor Advisory
https://hackerone.com/reports/1369312 CVEPermissions Required
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes [email protected]Release NotesVendor Advisory
https://hackerone.com/reports/1369312 [email protected]Permissions Required

Weakness Enumeration

CWE-IDCWE NameSource
CWE-918Server-Side Request Forgery (SSRF)[email protected]
CWE-918Server-Side Request Forgery (SSRF)[email protected]

Affected Products

ProductVersions
concretecms concrete cms
< 8.5.7

CPE

  • cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-22969
NVD Published Date:
Nov 19, 2021
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2021-22969 Details - Not Deferred