Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1nM3AyLWhmcXItOW0yNc0Xww

Improper file handling in concrete5/core

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

Permalink: https://github.com/advisories/GHSA-g3p2-hfqr-9m25
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1nM3AyLWhmcXItOW0yNc0Xww
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: 10 months ago

CVSS Score: 7.2
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-g3p2-hfqr-9m25, CVE-2021-22968
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-22968
• https://hackerone.com/reports/1350444
• https://documentation.concretecms.org/developers/introduction/version-history/857-release-notes
• https://github.com/advisories/GHSA-g3p2-hfqr-9m25

Blast Radius: 12.6

Affected Packages