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Date: Thu, 6 Jan 2022 19:55:31 +0800 (CST)
From: "Xiaoxiang Yu" <xxyu@...che.org>
To: oss-security@...ts.openwall.com
Cc: pwntester@...hub.com
Subject: CVE-2021-45457: Apache Kylin: Overly broad CORS configuration

Severity: moderate

Description:

Cross-origin requests with credentials are allowed to be sent from any origin.

Kylin reflects the `Origin` header and allow credentials to be sent cross-origin in the default configuration. The preflight OPTIONS request:
```
OPTIONS /kylin/api/projects HTTP/1.1
Host: localhost:7070
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:94.0) Gecko/20100101 Firefox/94.0
Accept: */*
Accept-Language: en-US
Accept-Encoding: gzip, deflate
Access-Control-Request-Method: POST
Access-Control-Request-Headers: content-type
Referer: http://b49b-95-62-58-48.ngrok.io/
Origin: http://b49b-95-62-58-48.ngrok.io
Connection: keep-alive
Cache-Control: max-age=0
```

Will be replied with:

```
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Access-Control-Allow-Origin: http://b49b-95-62-58-48.ngrok.io
Access-Control-Allow-Credentials: true
Vary: Origin
Access-Control-Allow-Methods: DELETE, POST, GET, OPTIONS, PUT
Access-Control-Allow-Headers: Authorization, Origin, No-Cache, X-Requested-With, Cache-Control, Accept, X-E4m-With, If-Modified-Since, Pragma, Last-Modified, Expires, Content-Type
Content-Length: 0
```
This issue affects Apache Kylin Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.

Mitigation:

Users of Kylin 2.x & Kylin 3.x should upgrade to 3.1.3 or apply patch https://github.com/apache/kylin/pull/1782.
Users of Kylin 4.x should upgrade to 4.0.1 or apply patch https://github.com/apache/kylin/pull/1781.

Credit:

Alvaro Munoz 





--

Best wishes to you ! 
From ´╝ÜXiaoxiang Yu

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