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Title: Seo Panel 2.1.0 - Critical File Disclosure Body: Seo Panel - Critical File Disclosure http://www.exploit-db.com/finding-0days-in-web-applications/ Versions Affected: 2.1.0 (previous versions were not checked.) Info: A complete open source seo control panel for managing search engine optimization of your websites. Seo Panel is a seo tool kit includes latest hot seo tools to increase and track the performace of your websites. External Links: http://www.seopanel.in/ Credits: MaXe (@InterN0T) -:: The Advisory ::- Seo Panel is prone to Critical File Disclosure due to download.php does not sanitize user- input properly via the "file" GET-parameter. By using ....// instead of ../ to traverse through directories and by appending a %00 byte in the end of the request it is possible to load virtually any file that the webserver user has read access to. The PHP function which reads & returns the data from the file is: readfile($var); Proof of Concept URL: http://example.tld/seopanel/download.php?filesec=sitemap&filetype=text&file=....//config/sp-config.php%00.txt Note: This attack requires a valid user though it works regardless of any privileges the user might have. (User registrations are enabled by default as well, making this attack possible in most scenarios.) -:: Solution ::- download.ctrl.php: (Line 55-62) 55 function isValidFile($fileName) { 56 $fileName = urldecode($fileName); // This tries to prevent directory traversal 57 $fileName = str_replace('../', '', $fileName); 58 if (preg_match('/\.xml$|\.html$|\.txt$/i', $fileName)) { 59 return $fileName; 60 } 61 return false; 62 } Suggested patch: (Line 55-62) 55 function isValidFile($fileName) { 56 $fileName = urldecode($fileName); // This isn't as easy to bypass anymore 57 $fileName = str_replace('..', '', $fileName); // This is changed. 58 if (preg_match('/\.xml$|\.html$|\.txt$/i', $fileName)) { 59 return $fileName; 60 } 61 return false; 62 } Disclosure Information: - Vulnerabilities found and researched: 31st October 2010 - Full Disclosure ~Early November 2010 |
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