Description

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.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

CNA:  GitHub, Inc.

Base Score:  4.7 MEDIUM

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

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  4.3 MEDIUM

Vector:  (AV:N/AC:M/Au:N/C:N/I:P/A:N)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

Hyperlink	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

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-346	Origin Validation Error	NIST   GitHub, Inc.

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

1 change records found show changes

Initial Analysis by NIST 12/22/2020 2:30:04 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:a:openzaak:open_zaak:*:*:*:*:*:*:*:* versions up to (excluding) 1.3.3
Added	CVSS V2		NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N)
Added	CVSS V2 Metadata		Victim must voluntarily interact with attack mechanism
Added	CVSS V3.1		NIST AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Added	CWE		NIST CWE-346
Changed	Reference Type	https://github.com/open-zaak/open-zaak/blob/master/CHANGELOG.rst#133-2020-12-17 No Types Assigned	https://github.com/open-zaak/open-zaak/blob/master/CHANGELOG.rst#133-2020-12-17 Release Notes, Third Party Advisory
Changed	Reference Type	https://github.com/open-zaak/open-zaak/commit/952269269f1b629fce9c94485f83ac13f31d6c46 No Types Assigned	https://github.com/open-zaak/open-zaak/commit/952269269f1b629fce9c94485f83ac13f31d6c46 Patch, Third Party Advisory
Changed	Reference Type	https://github.com/open-zaak/open-zaak/security/advisories/GHSA-chhr-gxrg-64x7 No Types Assigned	https://github.com/open-zaak/open-zaak/security/advisories/GHSA-chhr-gxrg-64x7 Third Party Advisory