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f5 waf bypass

It is a really useful tool that does its job well and blocks the attack vector, until the vendor of the application patches and eliminates the vulnerability. There are many tags that use this attribute and we can test them in the following way:As you can see here, we can add event handlers in the tags that use src attributes and we can use it by separating the tag from the src with a / . The page then constructs the page and executes the script we supplied earlier into the script tags.Despite that, in this attack the payload was not embedded by the server in the HTTP response, it arrived at the server as part of the request, so it is possible to be detected by an installed WAF, or server side controls. Automation is really important, because we have to compare our results with the results of an automated tool to have a different opinion available.WAFNinja is a Python written script, which is one of the best tools for automated bypassing WAF. For example:So here we are watching the %0B which internet explorer is handling as a space character, and executes correctly the payload. To save coding time, most of the WAFs rely on the negative model, so they have a database that will contain all the signatures generally in the form of REG-EX that would look for the patterns that the WAF is trying to block.
WAFs have to be implemented with caution, and even after their application we have to continue the maintenance of the applications.Finally, WAF represents a useful tool in the context of implementation of scalable protection of web-applications. As we can understand, DOM-based XSS is really dangerous and no WAF can filter it, due to its nature. In some cases, we might need to combine a few tamper scripts together in order to fool the WAF, and we can find a full list of them here:https://svn.sqlmap.org/sqlmap/trunk/sqlmap/tamper/ . WAF specific configurations on a BIG-IP system by using a declarative policy model. First of all, we have to try and insert harmless tags like

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or to see if they are blocked from the WAF and see how they get rendered from it in the HTTP response. As you can understand, this can be easily filtered out by a WAF, and Incapsula handles these attacks by combining all the parameters with the same name like the ASP does, before passing it to the later stages. We can also extend the payloads with the addition of the insert-bypass function. WAFNinja is a Python-based Web Application Firewall Attack Tool designed to help penetration testers execute WAF bypass by automating the steps necessary to bypass input validation.The tool was created with the objective to be easily extendible, simple to use and usable in a team environment.Many payloads and fuzzing strings, which are stored in a local database file come shipped with the tool.This does not work against F5 ASM despite the claims in the review article here:The tool wasn’t changed for a year and according to article it has only one XSS payload related to F5 ASM. To start SQLmap in Kali Linux, we just execute sqlmap in a terminal window, and for tamper scripts we use the -tamper option. In the first one, we take off the space between the iframe and src, so the WAF cannot identify them as keywords. If decoded, it produces You can see that we have used them more or less the same way as with earlier scripts, which tells us that we can have many alternative ways to try and bypass a WAF. For example:Finally, we have another event handler, the onshow one, that fires when a element is shown as a context menu, and works only on the Firefox web browser. An example attack could be:We use the second script, chardoublebleencode.py, if the application decodes the URL with the request.

The functions CHAR(), USER() and CONCAT() that we examined in module 2, got changed to FUNCTION%23randomText%0A(), because in our example it is identified that they were blocked by the WAF. The problem with that is that it can be bypassed easily, due to JavaScript’s nature and flexibility. But it was not possible to make a simple PoC because the application was built using Bitrix and the WAF module was activated. Activate F5 product registration key. If in this stage, the application has rendered correctly the applied tag, it means that the reg-ex is looking for both opening and closing brackets and doesn’t filter out the opening tag.To continue from these facts, we try some of the most common XSS scripts that most of the WAFs are filtering out. A remote user can bypass security policies on the target system. F5 is often better known for its BIG-IP appliances than its cloud services. As a practical example, we can give:This is a real bypassing example of an earlier version of ModSecurity WAF. So, for this example we are supplying something like this:After all these checks, let’s supply an tag and examine its response, and if the WAF is making the same checks, like it did in the first step we saw, and if not, we try to insert a JavaScript statement inside the href tag.Now we have to check the response of this alteration, and if the WAF has filtered out the JavaScript statement in the tag or only stripped the JavaScript, and if yes, we try to bypass this filter by playing with the case of the letters, like we did earlier.

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