#VU58365 Spoofing attack in cgi - CVE-2021-41819

Vulnerability identifier: #VU58365

Vulnerability risk: Medium

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

CVE-ID: CVE-2021-41819

CWE-ID: CWE-451

Exploitation vector: Network

Exploit availability: No

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

Vendor: Ruby

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in CGI::Cookie.parse. A remote attacker can spoof page content.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

cgi: 0.1.0 - 0.3.0

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External links
https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/

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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.