#VU57126 Input validation error in TYPO3 - CVE-2021-41114

Vulnerability identifier: #VU57126

Vulnerability risk: Low

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

CVE-ID: CVE-2021-41114

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TYPO3
Web applications / CMS

Vendor: TYPO3

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input in the HTTP Host header. A remote attacker can cause unspecified impact via a crafted HTTP Host header, related to "Host Spoofing."

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TYPO3: 11.0.0 - 11.4.0

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External links
https://github.com/TYPO3/typo3/security/advisories/GHSA-m2jh-fxw4-gphm
https://github.com/TYPO3/typo3/commit/5cbff85506cebe343e5ae59228977547cf8e3cf4
https://typo3.org/security/advisory/typo3-core-sa-2021-015

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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.