CVE-2020-26251
Open Zaak CORS Policy Misconfiguration
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.
INFO
Published Date :
Dec. 18, 2020, 6:15 p.m.
Last Modified :
Dec. 22, 2020, 7:30 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.7
Exploitability Score :
1.6
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2020-26251.
| URL | 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2020-26251 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2020-26251 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
Initial Analysis by [email protected]
Dec. 22, 2020
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N 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 Added CWE NIST CWE-346 Added CPE Configuration OR *cpe:2.3:a:openzaak:open_zaak:*:*:*:*:*:*:*:* versions up to (excluding) 1.3.3
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2020-26251 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2020-26251
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.10 }} 0.02%
score
0.41135
percentile