Open Zaak is a modern, open-source data- and services-layer to enable zaakgericht werken, a Dutch approach to case management. In Open Zaak before version 1.3.3 the Cross-Origin-Resource-Sharing policy in Open Zaak is currently wide open - every client is allowed. This allows evil.com to run scripts that perform AJAX calls to known Open Zaak installations, and the browser will not block these. This was intended to only apply to development machines running on localhost/127.0.0.1. Open Zaak 1.3.3 disables CORS by default, while it can be opted-in through environment variables. The vulnerability does not actually seem exploitable because: a) The session cookie has a `Same-Site: Lax` policy which prevents it from being sent along in Cross-Origin requests. b) All pages that give access to (production) data are login-protected c) `Access-Control-Allow-Credentials` is set to `false` d) CSRF checks probably block the remote origin, since they're not explicitly added to the trusted allowlist.
References
Link | Resource |
---|---|
https://github.com/open-zaak/open-zaak/blob/master/CHANGELOG.rst#133-2020-12-17 | Release Notes Third Party Advisory |
https://github.com/open-zaak/open-zaak/commit/952269269f1b629fce9c94485f83ac13f31d6c46 | Patch Third Party Advisory |
https://github.com/open-zaak/open-zaak/security/advisories/GHSA-chhr-gxrg-64x7 | Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: GitHub_M
Published: 2020-12-18T17:20:13
Updated: 2020-12-18T17:20:13
Reserved: 2020-10-01T00:00:00
Link: CVE-2020-26251
JSON object: View
NVD Information
Status : Analyzed
Published: 2020-12-18T18:15:12.543
Modified: 2020-12-22T19:30:04.637
Link: CVE-2020-26251
JSON object: View
Redhat Information
No data.
CWE