Vulnerability Description
A bypass of adding remote files in Concrete CMS (previously concrete5) File Manager leads to remote code execution in Concrete CMS (concrete5) versions 8.5.6 and below.The external file upload feature stages files in the public directory even if they have disallowed file extensions. They are stored in a directory with a random name, but it's possible to stall the uploads and brute force the directory name. You have to be an admin with the ability to upload files, but this bug gives you the ability to upload restricted file types and execute them depending on server configuration.To fix this, a check for allowed file extensions was added before downloading files to a tmp directory.Concrete CMS Security Team gave this a CVSS v3.1 score of 5.4 AV:N/AC:H/PR:H/UI:R/S:C/C:N/I:H/A:NThis fix is also in Concrete version 9.0.0
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | < 8.5.7 |
Related Weaknesses (CWE)
References
- https://documentation.concretecms.org/developers/introduction/version-history/85Release NotesVendor Advisory
- https://hackerone.com/reports/1350444ExploitThird Party Advisory
- https://documentation.concretecms.org/developers/introduction/version-history/85Release NotesVendor Advisory
- https://hackerone.com/reports/1350444ExploitThird Party Advisory
FAQ
What is CVE-2021-22968?
CVE-2021-22968 is a vulnerability with a CVSS score of 7.2 (HIGH). A bypass of adding remote files in Concrete CMS (previously concrete5) File Manager leads to remote code execution in Concrete CMS (concrete5) versions 8.5.6 and below.The external file upload feature...
How severe is CVE-2021-22968?
CVE-2021-22968 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-22968?
Check the references section above for vendor advisories and patch information. Affected products include: Concretecms Concrete Cms.