CVE-2020-11067 Deserialization of Untrusted Data in TYPO3 CMS

What is CVE-2020-11067?

CVE-2020-11067 is a high-severity unsafe deserialization vulnerability in Typo3 Typo3, published on 13 May 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

In TYPO3 CMS 9.0.0 through 9.5.16 and 10.0.0 through 10.4.1, it has been discovered that backend user settings (in $BE_USER->uc) are vulnerable to insecure deserialization. In combination with vulnerabilities of third party components, this can lead to remote code execution. A valid backend user account is needed to exploit this vulnerability. This has been fixed in 9.5.17 and 10.4.2.

Weakness: CWE-502

Which versions are affected by CVE-2020-11067?

9 open source packages ship an affected version, including typo3/cms, typo3 and typo3/cms-core. It affects 1 product.

Products include Typo3 Typo3.

How do I fix CVE-2020-11067?

Upgrade typo3/cms to a fixed version for your release line: 10.4.2 or 9.5.17.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2020-11067 being exploited?

There is no known exploitation of CVE-2020-11067 in the wild and no public exploit code.

Other vulnerabilities in Typo3 Typo3

• CVE-2009-0258 Indexed Search Engine for TYPO3 Command Execution via Metacharacter Injection Critical 10.0
• CVE-2011-3583 Typo3 SQL injection due to faulty prepared statements Critical 9.8
• CVE-2011-4628 Typo3 Authentication Bypass Critical 9.8
• CVE-2023-24814 Persisted Cross-Site Scripting in Frontend Rendering in typo3 High 8.8
• CVE-2021-41113 Cross-Site-Request-Forgery in Backend URI Handling in Typo3 High 8.8

All Typo3 Typo3 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-typo3-2020-11067, GHSA-2wj9-434x-9hvp.