#VU53703 Resource exhaustion in ws - CVE-2021-32640

Vulnerability identifier: #VU53703

Vulnerability risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-32640

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
ws
Web applications / Modules and components for CMS

Vendor: WebSockets

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources in the "Sec-Websocket-Protocol" header. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

ws: 0.0.1 - 7.4.5

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External links
https://github.com/websockets/ws/security/advisories/GHSA-6fc8-4gx4-v693
https://github.com/websockets/ws/commit/00c425ec77993773d823f018f64a5c44e17023ff

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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. However, proof of concept for this vulnerability is available.