Two vulnerabilities have been reported in TYPO3, which can be exploited by malicious people to conduct cross-site scripting attacks, and by malicious users to compromise a vulnerable system.
1) The vulnerability is caused due to an error in the handling of file uploads, if a filename has multiple file extensions (e.g. "file.php.1") or starts with a dot character (e.g. ".htaccess"). This can be exploited to execute arbitrary code.
Successful exploitation of this vulnerability requires a certain server configuration. It also requires either valid backend user credentials and access to filemounts, or that frontend plugins using "t3lib_div::verifyFilenameAgainstDenyPattern()" or "processFiles()" to handle file uploads are installed.
2) Input passed in unspecified parameters to fe_adminlib.inc is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
Successful exploitation of this vulnerability requires that a frontend extension based on fe_adminlib.inc is installed - e.g. direct_mail_subscription, feuser_admin, or kb_md5fepw.
The vulnerabilities are reported in all 3.x versions, 4.0.x versions below 4.0.9, 4.1.x versions below 4.1.7, and in 4.2.0.
Solution: Update to version 4.0.9, 4.1.7, or 4.2.1.
Provided and/or discovered by: 1) The vendor credits Michiel Roos and Marcus Krause.
2) The vendor credits Christian Seifert, Jeroen van Iddekinge, and Arnd Messer.
Original Advisory: TYPO3-20080611-1:
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Subject: TYPO3 File Upload and Cross-Site Scripting Vulnerabilities
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