Posts

Apache mod_negotiation or MultiViews filename bruteforcing

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Filename   Brute-forcing  through MultiViews Vulnerability This is a small post about a way to easily get backup files on Apache web servers with Multiviews option enabled. There is no much information in Multiviews (an Apache feature) and some Web Application scanners report this as Apache mod_negotiation filename brute-forcing rather than Multiviews option enabled. Apache HTTPD supports content negotiation as described in the HTTP/1.1 specification (see http://www.w3.org/Protocols/rfc2616/rfc2616.html ). It can choose the best representation of a resource based on the browser-supplied preferences for media type, languages, character set and encoding. It also implements a couple of features to give more intelligent handling of requests from browsers that send incomplete negotiation information. What are resources A resource is a conceptual entity identified by a URI (RFC 2396). An HTTP server like Apache HTTP Server provides access to representations of the resource(s...
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PHP Source Code Chunks of Insanity (Delete Post Pages) Part 4

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Intro  This post is going to talk about source code reviewing PHP and demonstrate how a relatively small chunk of code can cause you lots of problems. The Code In this article we are going to analyze the code displayed below. The code displayed below might seem innocent for some , but obviously is not. We are going to assume that is used by some web site to delete posts from the logged in users securely. <?php require_once 'common.php'; validatemySession(); mydatabaseConnect(); $username = $_SESSION['username'];// Insecure source $username = stripslashes($username);// Improper filtering $username = mysql_real_escape_string($username);//Flawed function // Delete the post that matches the postId ensuring that it was created by this user $queryDelete = "DELETE FROM posts WHERE PostId = " . (int) $_GET['postId']. " AND Username = '$username'"; if (mysql_query($queryDelete))// Bad validation co...
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PHP Source Code Chunks of Insanity (Post Pages) Part 3

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Intro  This post is going to talk about source code reviewing PHP and demonstrate how a relatively small chunk of code can cause you lots of problems. The Code In this article we are going to analyze the code displayed below. The code displayed below might seem innocent for some , but obviously is not. We are going to assume that is used by some web site to post the user comments securely. <?php require_once 'common.php'; validateMySession(); ?> <html> <head> <title>User Posts</title> </head> <body> <h1>Showing current posts</h1> <form action='awsomePosts.php'> <p>MySearch: <input type='text'  value='<?php if (isset($_GET['search'])) echo htmlentities($_GET['search'])?>'></p> <p><input type='submit' value='MySearch'></p> </form> <?php showAwsomePosts();?> ...
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