RST/GHC -- JOOMLA CMS -- ADVISORY #37 Product: Joomla Affected version: 1.0.7 Last version: 1.0.7 Vendor: Joomla! URL: http://www.joomla.org/ online demo: http://demo.joomla.org/ VULNERABILITY CLASS: DoS, path disclosing [Product Description] Joomla! is a Content Management System (CMS) created by the same award-winning team that brought the Mambo CMS to its current state of stardom. [Summary] An attacker can invoke some undesirable situations for server administrator. [Details] 1. Real server path disclose and arbitrary filename creation. Vulnerable script: includes/feedcreator.class.php [code] function saveFeed($filename="", $displayContents=true) { if ($filename=="") { $filename = $this->_generateFilename(); } $feedFile = fopen($filename, "w+"); if ($feedFile) { fputs($feedFile,$this->createFeed()); fclose($feedFile); if ($displayContents) { $this->_redirect($filename); } [/code] Exploit: Vulnerable script: index.php?option=com_rss&feed=filename_here&no_html=1 An attacker can write simple code to soil the server by lots of cashed files. To disclose real path - just put slash symbol in the filename. 2. Denial of service. Vulnerable script: includes/phpInputFilter/class.inputfilter.php Anti-xss code will not cope with several tags. This can cause denial of servise. Exploit: index.php?option=com_poll&task=results&id=14&mosmsg=DOS@HERE<<>AAA<><> [DISCLOSURE TIMELINE] 09/02/06 - vendor notification 26/02/06 - new release (1.0.8) with bugfix bugs discovered by Foster RST/GHC http://rst.void.ru http://www.ghc.ru
