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Home  Ask the Team  Mailing Lists  Advertising Info  Advisories  About SecuriTeam  Blogs Brought to you by: Suppliers of: Website Testing Tools Network Testing Tools Software Testing Tools SecuriTeam in Your Inbox New vulnerability? New tool? Tell us (Our PGP key). Confidence 2013 5% Off any SANS course Use Code: SecuriTeam_5 Hack In Paris La Nuit du Hack Subjects of Interest: Vulnerability Management SQL Injection Buffer Overflows Active Network Scanning Fuzzing Fuzzer Report Network Security Network Scanner Pen Testing Security Scanner	ArrowChat External.php Lang Parameter Traversal Local File Inclusion Vulnerability 5 Apr. 2013    Summary ArrowChat External.php lang parameter traversal local suffers from file inclusion vulnerability.   Credit: The information has been provided by kallimero. Free Website Security Scan Free Fuzzer Report Vulnerability Assessment Detect web app vulnerabilities University study comparing the top Accurate and automated scanning Get guidance from professionals. 6 commercially availble fuzzers. for networks of any size.    Details Protect your website! Free Trial, Nothing to install. No interruption of visitors. www.beyondsecurity.com/vulnerability-scanner Vulnerable Systems:  * ArrowChat 1.5.61 ArrowChat contains a flaw that allows an attacker to traverse outside of a restricted path. The issue is due to the external.php script not properly sanitizing user input, specifically directory traversal style attacks (e.g., ../../) supplied via the 'lang' parameter. This directory traversal attack would allow a local attacker to include arbitrary files. PoC: http:// [site]/[path]/admin/layout/pages_general.php/'"/> How to Fix ? -=========== To fix the LFI, you can replace it with : // Load another language if lang GET value is set and exists if (var_check('lang')) { $lang = get_var('lang'); if(preg_match("#^[a-z]{2,5}$#i", $lang)){ if (file_exists(dirname(__FILE__) . DIRECTORY_SEPARATOR . AC_FOLDER_LANGUAGE . DIRECTORY_SEPARATOR . $lang . DIRECTORY_SEPARATOR . $lang . ".php")) { include (dirname(__FILE__) . DIRECTORY_SEPARATOR . AC_FOLDER_LANGUAGE . DIRECTORY_SEPARATOR . $lang . DIRECTORY_SEPARATOR . $lang . ".php"); } } } lang will be include only if it's a valid lang file. For the XSS's, you can use a .htaccess to protect the layout directory, and use htmlentities to avoid the html inj'. 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