CVEvulnerability

CVE-2021-22968

7.2 HIGH Published 2021-11-19 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-11-19
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.2 HIGH — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
6.5 MEDIUM — AV:N/AC:L/Au:S/C:P/I:P/A:P
Weaknesses
CWE-330, CWE-434, CWE-98

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

Affected configurations

• concretecms concrete cms (< 8.5.7)

Related

Weakness · CWE (3)

  • CWE-330 Use of Insufficiently Random Values weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type weakness
  • CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program weakness

References