2/2/2023 0 Comments App color oracleSome examples when an item must be left Unrestricted are: In some cases, this default is needed in order for the application to work. However, for Hidden and Display Only items, it is common for application logic to depend on their values this logic may be adversely affected by malicious values supplied via the URL. The majority of these items are editable input items, so the fact that someone may input a value via the URL is not a big deal. As Martin D’Souza pointed out a decade ago, URL tampering for any item in the application is possible from any page in the application that is Unrestricted. UPDATE: in fact, this applies even if it’s a different page in the same application. However, what if a developer later needs to change the page to Unrestricted? They may unwittingly introduce a potential URL tampering issue because one or more items were not protected. At runtime, if a malicious visitor tries to modify the item value via the URL, they will get the error “ No checksum was provided to show processing for a page that requires a checksum when one or more request, clear cache, or argument values are passed as parameters.“ This is ok for Form items because the page fetch process will set their values on page load, rendering any attempt at URL tampering ineffective.įor non-form page items, unless the Page Access Protection is relaxed ( Unrestricted), leaving items unrestricted is safe since URL tampering is blocked for the entire page anyway. If you change these, it becomes your responsibility to ensure that your application is protected against security vulnerabilities from URL tampering.įor page items, however, the Protection Level defaults to Unrestricted. These default settings are considered best practice. (* that is, any item mapped from a table column that is, or forms part of, a Primary Key constraint).
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