CVE-2021-22968: Malicious File Upload
First published: Fri Nov 19 2021(Updated: )
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
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Concretecms Concrete Cms | <8.5.7 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID for this vulnerability?
The vulnerability ID for this vulnerability is CVE-2021-22968.
What is the severity level of CVE-2021-22968?
The severity level of CVE-2021-22968 is high, with a severity value of 7.2.
Which versions of Concrete CMS (concrete5) are affected by CVE-2021-22968?
Concrete CMS (concrete5) versions 8.5.6 and below are affected by CVE-2021-22968.
What is the impact of CVE-2021-22968?
CVE-2021-22968 allows bypassing file upload restrictions in Concrete CMS File Manager, leading to remote code execution.
Are there any resources available for more information about CVE-2021-22968?
Yes, you can find more information about CVE-2021-22968 in the Concrete CMS documentation and the HackerOne report.
- collector/nvd-index
- vendor/concretecms
- product/concrete cms
- canonical/concretecms concrete cms