CVE-2021-22969

Severity Score

5.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

Concrete CMS (antes concrete5) versiones anteriores a 8.5.7, presentan una omisión de mitigación de tipo SSRF usando un ataque DNS Rebind dando a un atacante la capacidad de conseguir claves IAM en la nube IAAS (ex AWS). Para corregir esto Concrete CMS ya no permite descargas desde la red local y especifica la IP comprobada cuando descarga en lugar de confiar en DNS.Discoverer: Adrian Tiron de FORTBRIDGE ( https://www.fortbridge.co.uk/ ).El equipo de Concrete CMS dio a esto una puntuación CVSS 3.1 de 3.5 AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N . Por favor, tenga en cuenta que los errores de configuración de los proveedores de Cloud IAAS no son vulnerabilidades concretas de CMS. Una mitigación para esta vulnerabilidad es asegurarse de que las configuraciones de IMDS están de acuerdo con las mejores prácticas del proveedor de la nube. Esta corrección también está en Concrete versión 9.0.0

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-06 CVE Reserved
2021-11-19 CVE Published
2024-08-03 CVE Updated
2024-08-04 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-918: Server-Side Request Forgery (SSRF)

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes	2021-11-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Concretecms Search vendor "Concretecms"		Concrete Cms Search vendor "Concretecms" for product "Concrete Cms"				< 8.5.7 Search vendor "Concretecms" for product "Concrete Cms" and version " < 8.5.7"		-		Affected