TYPO3 Formhandler Extension Cross Site Scripting Vulnerability

Bugtraq ID:	101935
Class:	Input Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Nov 07 2017 12:00AM
Updated:	Dec 19 2017 10:37PM
Credit:	Till Maas
Vulnerable:	Typo3 Formhandler 2.4 Typo3 Formhandler 1.6.1 Typo3 Formhandler 1.6 Typo3 Formhandler 1.4.1 Typo3 Formhandler 1.4 Typo3 Formhandler 2.3.1 Typo3 Formhandler 2.3.0 Typo3 Formhandler 2.0.2 Typo3 Formhandler 1.6.2
Not Vulnerable:	Typo3 Formhandler 2.4.1

TYPO3 Formhandler Extension Cross Site Scripting Vulnerability

The Formhandler extension for TYPO3 is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may let the attacker steal cookie-based authentication credentials and launch other attacks.

Typo3 Formhandler 2.4.0 and prior versions are vulnerable.

TYPO3 Formhandler Extension Cross Site Scripting Vulnerability

Attackers can exploit this issue by enticing an unsuspecting user into following a malicious URI.

TYPO3 Formhandler Extension Cross Site Scripting Vulnerability

Solution:
Updates are available. Please see the references or vendor advisory for more information.

TYPO3 Formhandler Extension Cross Site Scripting Vulnerability

References:

• TYPO3 Homepage (TYPO3)
  
• TYPO3-EXT-SA-2017-011: Cross Site-Scripting in extension 'Formhandler' (TYPO3)