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In a semantic URL attack, a client manually adjusts the parameters of its request by maintaining the URL's syntax but altering its semantic meaning. This attack is primarily used against CGI driven websites. A similar attack involving web browser cookies is commonly referred to as ''cookie poisoning''. ==Example== Consider a web-based e-mail application where users can reset their password by answering the security question correctly, and allows the users to send the password to the e-mail address of their choosing. After they answer the security question correctly, the web page will arrive to the following web form where the users can enter their alternative e-mail address: The receiving page, resetpassword.php, has all the information it needs to send the password to the new e-mail. The hidden variable username contains the value user001, which is the username of the e-mail account. Because this web form is using the GET data method, when the user submits the user then arrives at the following URL: : This URL appears in the location bar of the browser, so the user can identify the username and the e-mail address through the URL parameters. The user may decide to steal other people's (user002) e-mail address by visiting the following URL as an experiment: : If the resetpassword.php accepts these values, it is vulnerable to a semantic URL attack. The new password of the user002 e-mail address will be generated and sent to One method of avoiding semantic URL attacks is by using session variables.〔(Chris Shiflett. Essential PHP Security: Chapter 2, Forms and URLs )〕 However, session variables can be vulnerable to other types of attacks such as session hijacking and cross-site scripting. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Semantic URL attack」の詳細全文を読む スポンサード リンク
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