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
History

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cve-icon MITRE Information

Status: PUBLISHED

Assigner: hackerone

Published: 2021-11-19T18:08:30

Updated: 2021-11-19T18:08:30

Reserved: 2021-01-06T00:00:00


Link: CVE-2021-22969

JSON object: View

cve-icon NVD Information

Status : Analyzed

Published: 2021-11-19T19:15:08.507

Modified: 2021-11-23T13:35:11.350


Link: CVE-2021-22969

JSON object: View

cve-icon Redhat Information

No data.

CWE