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CVE-2020-26251 Detail

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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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 cwe source acceptance level NIST   GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-26251
NVD Published Date:
12/18/2020
NVD Last Modified:
12/22/2020
Source:
GitHub, Inc.