CVE-2021-41113 Cross-Site-Request-Forgery in Backend URI Handling in Typo3
Attackers can exploit CSRF in TYPO3 backend deep links to create admin accounts if specific cookie settings are used.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-41113?
CVE-2021-41113 is a high-severity vulnerability in Typo3 Typo3, published on 5 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that the new TYPO3 v11 feature that allows users to create and share deep links in the backend user interface is vulnerable to cross-site-request-forgery. The impact is the same as described in TYPO3-CORE-SA-2020-006 (CVE-2020-11069). However, it is not limited to the same site context and does not require the attacker to be authenticated. In a worst case scenario, the attacker could create a new admin user account to compromise the system. To successfully carry out an attack, an attacker must trick his victim to access a compromised system. The victim must have an active session in the TYPO3 backend at that time. The following Same-Site cookie settings in $GLOBALS[TYPO3_CONF_VARS][BE][cookieSameSite] are required for an attack to be successful: SameSite=strict: malicious evil.example.org invoking TYPO3 application at good.example.org and SameSite=lax or none: malicious evil.com invoking TYPO3 application at example.org. Update your instance to TYPO3 version 11.5.0 which addresses the problem described.
Weakness: CWE-352
Which versions are affected by CVE-2021-41113?
5 open source packages ship an affected version, including typo3/cms, typo3 and typo3/cms-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
typo3/cms Packagist | From 11.2.0 | 11.5.0 |
typo3/cms Packagist | From 11.2.0 | 11.5.0 |
typo3 Bitnami | From 11.2.0 | 11.5.0 |
typo3/cms-core Packagist | From 11.2.0 | 11.5.0 |
typo3/cms-core Packagist | From 11.2.0 | 11.5.0 |
Products include Typo3 Typo3.
How do I fix CVE-2021-41113?
Upgrade typo3/cms to 11.5.0 or later.
Is CVE-2021-41113 being exploited?
There is no known exploitation of CVE-2021-41113 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
- CVE-2011-3583 Typo3 SQL injection due to faulty prepared statements
- CVE-2011-4628 Typo3 Authentication Bypass
- CVE-2023-24814 Persisted Cross-Site Scripting in Frontend Rendering in typo3
- CVE-2020-15098 Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS
Sources
Also known as BIT-typo3-2021-41113, GHSA-657m-v5vm-f6rw.