The Backend subcomponent in TYPO3 4.0.13 and earlier, 4.1.x before 4.1.13, 4.2.x before 4.2.10, and 4.3.x before 4.3beta2, when the DAM extension or ftp upload is enabled, allows remote authenticated users to execute arbitrary commands via shell metacharacters in a filename.
https://exchange.xforce.ibmcloud.com/vulnerabilities/53923
http://www.vupen.com/english/advisories/2009/3009
http://www.securityfocus.com/bid/36801
http://typo3.org/teams/security/security-bulletins/typo3-sa-2009-016/