#VU55668 Race condition in Go programming language - CVE-2021-36221

Vulnerability identifier: #VU55668

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-36221

CWE-ID: CWE-362

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 perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition in net/http/httputil ReverseProxy when handling ErrAbortHandler events. A remote attacker can trigger a race condition and crash the ReverseProxy.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.15 - 1.16.6

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External links
https://groups.google.com/g/golang-announce/c/JvWG9FUUYT0
https://groups.google.com/forum/#!forum/golang-announce
https://groups.google.com/g/golang-announce/c/uHACNfXAZqk

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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.