CVE-2021-22969

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

• CWE-918
• CWE-918

• https://documentation.concretecms.org/developers/introduction/version-history/857-release-notesRelease Notes, Vendor Advisory
• https://hackerone.com/reports/1369312Permissions Required
• https://documentation.concretecms.org/developers/introduction/version-history/857-release-notesRelease Notes, Vendor Advisory
• https://hackerone.com/reports/1369312Permissions Required

Published

Nov 19, 2021

Last Modified

Jun 17, 2026

Status

Modified

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