TYPO3 4.0.x before 4.0.9, 4.1.x before 4.1.7, and 4.2.x before 4.2.1, uses an insufficiently restrictive default fileDenyPattern for Apache, which allows remote attackers to bypass security restrictions and upload configuration files such as .htaccess, or conduct file upload attacks using multiple extensions.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42988
http://www.vupen.com/english/advisories/2008/1802
http://www.securityfocus.com/bid/29657
http://www.securityfocus.com/archive/1/493270/100/0/threaded
http://www.debian.org/security/2008/dsa-1596
http://typo3.org/teams/security/security-bulletins/typo3-20080611-1/
http://securityreason.com/securityalert/3945
http://secunia.com/advisories/30660