#VU56023 Missing Authorization in Go programming language - CVE-2021-33197

Vulnerability identifier: #VU56023

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-33197

CWE-ID: CWE-862

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Go programming language
Universal components / Libraries / Scripting languages

Vendor: Google

Description

The vulnerability allows a remote attacker to bypass authorization process.

The vulnerability exists due to an error in some configurations of ReverseProxy (from net/http/httputil). A remote attacker can drop arbitrary headers and bypass authorization process. 

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.15 - 1.16.4

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External links
https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI
https://groups.google.com/g/golang-announce

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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.