CVE-2020-26251

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Summary

CVECVE-2020-26251
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-12-18 18:15:00 UTC
Updated2020-12-22 19:30:00 UTC
DescriptionOpen 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.

Risk And Classification

Problem Types: CWE-346

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openzaak Open Zaak All All All All
Application Openzaak Open Zaak All All All All

References

ReferenceSourceLinkTags
CORS configuration is possibly vulnerable · Advisory · open-zaak/open-zaak · GitHub CONFIRM github.com Third Party Advisory
Merge pull request from GHSA-chhr-gxrg-64x7 · open-zaak/open-zaak@9522692 · GitHub MISC github.com Patch, Third Party Advisory
open-zaak/CHANGELOG.rst at master · open-zaak/open-zaak · GitHub MISC github.com Release Notes, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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