Vulnerability identifier: #VU19229

Vulnerability risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-13611

CWE-ID: CWE-942

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Python Engine.IO
Web applications / Other software

Vendor: Miguel Grinberg

Description

The vulnerability allows a remote attacker to bypass the CORS protection mechanism.

The vulnerability exists due to incorrect processing of the "Origin" HTTP header that is supplied within HTTP request. A remote attacker can supply arbitrary value via the "Origin" HTTP header, bypass implemented CORS protection mechanism and perform Cross-Site WebSocket Hijacking (CSWSH) attacks against the vulnerable application.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Python Engine.IO: 0.1.0 - 3.8.2

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External links
http://github.com/miguelgrinberg/python-engineio/issues/128

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.