Vulnerability identifier: #VU17244

Vulnerability risk: High

CVSSv3.1: 8.6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: N/A

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 execute arbitrary code.

The vulnerability exists missing file extensions in $GLOBALS['TYPO3_CONF_VARS']['BE'][‘fileDenyPattern’]. A remote attacker can upload *.phar, *.shtml, *.pl or *.cgi files which can be executed in certain web server setups.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
The vulnerability has been addressed in the versions 8.7.23 and 9.5.4.

Vulnerable software versions

TYPO3: 9.5.0 - 9.5.3, 9.2.0 - 9.4.0, 8.0.0 - 8.7.22

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External links
http://typo3.org/security/advisory/typo3-core-sa-2019-008/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.