#VU54078 Observable discrepancy in websockets - CVE-2021-33880

Vulnerability identifier: #VU54078

Vulnerability risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-33880

CWE-ID: CWE-203

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
websockets
Universal components / Libraries / Libraries used by multiple products

Vendor: Aymeric Augustin

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to observable timing discrepancy on server when HTTP Basic authentication is enabled with basic_auth_protocol_factory(credentials=...). A remote attacker can guess passwords via timing attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

websockets: 1.0 - 9.0.2

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External links
http://github.com/aaugustin/websockets/commit/547a26b685d08cac0aa64e5e65f7867ac0ea9bc0

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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.