![]() ![]() One example would be to send a very large path, break the headers format, or change the HTTP version. Try sending a request that breaks the HTTP RFC.Try to request folders that exist and see the server behavior (403s, blank page, or directory listing).Search for random files and folders that will not be found (404s).In order to trigger error messages, a tester must: Another way would be to look into their documentation, or simply setup a server locally and discover the errors by going through the pages that the web server uses. If one is not familiar with how they look, searching online for them would provide examples. Web servers have known error messages and formats. Some of the most famous web servers are NGINX, Apache, and IIS. Web apps must handle and parse HTTP requests, and for that a web server is always part of the stack. Web ServersĪll web apps run on a web server, whether it was an integrated one or a full fledged one. Controls bypass where a certain exception is not restricted by the logic set around the happy path.Įrrors are usually seen as benign as they provide diagnostics data and messages that could help the user understand the problem at hand, or for the developer to debug that error.īy trying to send unexpected data, or forcing the system into certain edge cases and scenarios, the system or application will most of the times give out a bit on what’s happening internally, unless the developers turned off all possible errors and return a certain custom message.DoS the system by forcing the system into a deadlock or an unhandled exception that sends a panic signal to the engine running it.Gather the versions and types of applications being used.Map the various services integrating with each other by gaining insight on internal systems and frameworks used, which opens up doors to attack chaining.Understand the APIs being used internally.Improper error handling can allow attackers to: ![]() When the developer only consider the happy path, they forget all other possible user-input the code can receive but can’t handle. sending a string where an integer is expected). Developers often ignore handling these errors, or push away the idea that a user will ever try to trigger an error purposefully ( e.g. Home > Latest > 4-Web Application Security Testing > 08-Testing for Error Handling Testing for Improper Error Handling IDĪll types of applications (web apps, web servers, databases, etc.) will generate errors for various reasons. ![]()
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