CVE-2021-22969

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

Category

5.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.25%
Vendor Advisory concretecms.org
Affected: n/a https://github.com/concrete5/concrete5
Published at:
Updated at:

References

Link Tags
https://hackerone.com/reports/1369312 permissions required
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes release notes vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-22969?
CVE-2021-22969 has been scored as a medium severity vulnerability.
How to fix CVE-2021-22969?
To fix CVE-2021-22969, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-22969 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-22969 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-22969?
CVE-2021-22969 affects n/a https://github.com/concrete5/concrete5.
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