CVE-2021-22969 : Concrete CMS (formerly concrete5) versions below 8.5.7 has a SSRF mitigation byp

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

Published 2021-11-19 19:15:09

Updated 2021-11-23 13:35:11

Source HackerOne

View at NVD, CVE.org

Vulnerability category: Server-side request forgery (SSRF)

Products affected by CVE-2021-22969

Concretecms » Concrete Cms
Versions before (<) 8.5.7
cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2021-22969

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 36 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-22969

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:P/I:N/A:N	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Partial Integrity Impact: None Availability Impact: None
5.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	3.9	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: Low Integrity: None Availability: None

CWE ids for CVE-2021-22969

CWE-918 Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
Assigned by:
- nvd@nist.gov (Primary)
- support@hackerone.com (Secondary)

References for CVE-2021-22969

https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes

8.5.7 Release Notes :: Concrete CMS
Release Notes;Vendor Advisory

CVEs referencing this url
https://hackerone.com/reports/1369312

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Vulnerability Details : CVE-2021-22969

Products affected by CVE-2021-22969

Exploit prediction scoring system (EPSS) score for CVE-2021-22969

CVSS scores for CVE-2021-22969

CWE ids for CVE-2021-22969

References for CVE-2021-22969