Vulnerability · Published Nov 19, 2021 · Assigned by hackerone
CVE-2021-22969
Medium 5.3
In plain English
A medium-severity server-side request forgery in https://github.com/concrete5/concrete5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | concrete5/core | 8.5.7 | GHSA-mcxr-fx5f-96qq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | https://github.com/concrete5/concrete5 | Affected version Concrete CMS (concrete5) 8.5.6 and below. Fixed in Concrete CMS version 8.5.7 and 9.0.0 |
Weakness: CWE-918
References
- https://hackerone.com/reports/1369312 x_refsource_MISC
- https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes x_refsource_MISC