#VU23646 Deserialization of Untrusted Data in TYPO3

Vulnerability identifier: #VU23646

Vulnerability risk: Medium

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: N/A

CWE-ID: CWE-502

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 on the target system.

The vulnerability exists due to insecure input validation when processing serialized data within the Extbase Request Handling. A remote attacker can submit specially crafted data to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system but requires the ability to sign the request with a valid HMAC-SHA1 key.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

TYPO3: 8.0.0 - 8.7.29, 9.0.0 - 9.5.11

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External links
https://typo3.org/security/advisory/typo3-psa-2019-011/

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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.