PT-2023-12286 · Instructure · Instructure Canvas Lms

Gaukas + 1 · Published 2023-01-26 · Updated 2024-01-31 · CVE-2021-36539

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Instructure Canvas LMS (affected versions not specified)

Description The issue concerns improper access control in Instructure Canvas LMS, where unprivileged users can access locked or unpublished files through the DocViewer based file preview URL, referred to as canvadoc session url. This allows unauthorized access to sensitive information.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

IDOR

Weakness Enumeration

CWE-639

Related Identifiers

BIT-CANVASLMS-2021-36539

CVE-2021-36539

Affected Products

Instructure Canvas Lms

References · 7

• 🔥 https://github.com/instructure/canvas-lms/issues/1905 · Exploit
• 🔥 https://github.com/gaukas/instructure-canvas-file-oracle · Exploit
• https://osv.dev/vulnerability/CVE-2021-36539 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-canvaslms-2021-36539 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-36539 · Security Note
• https://t.me/cvenotify/43180 · Telegram Post
• https://t.me/cvenotify/68622 · Telegram Post