PT-2021-22817 · Unknown · Concrete Cms

Published 2021-09-27 · Updated 2021-09-30 · CVE-2021-40109

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Concrete CMS versions through 8.5.5

Description A Server-Side Request Forgery (SSRF) issue allows users to access forbidden files on their local network. Users with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type, and the redirect is followed, loading the contents of the file from the redirected-to server. This enables the upload of files of disallowed types.

Recommendations For Concrete CMS versions through 8.5.5, update to a version later than 8.5.5 to resolve the issue. As a temporary workaround, consider restricting the ability to upload files from external sites to minimize the risk of exploitation.

Fix

SSRF

Weakness Enumeration

CWE-918

Related Identifiers

CVE-2021-40109

Affected Products

Concrete Cms

References · 5

• https://documentation.concretecms.org/developers/introduction/version-history/856-release-notes · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-40109 · Security Note
• https://osv.dev/vulnerability/CVE-2021-40109 · Vendor Advisory
• https://t.me/cibsecurity/29446 · Telegram Post
• https://hackerone.com/reports/1102105 · Note