![]() From here, a remote code execution vulnerability could be explored via the execution of a crafted payload. If the username parameter is greater than eight bytes, the application will crash, and that will create a buffer overflow condition. ![]() When an automation program (the fuzzer) sends arbitrary payloads during the authentication process, several username payloads can be generated with different sizes and character sets, or even templates. If the size of the username string is equal to eight bytes, the max size of a string can be: infosec1 (eight characters) or username, as you can see below. Let’s take an FTP application as an example. In brief, the application receives two user inputs - the username and password string - which are then received and verified to allow the creation of a session allowing later access to other authenticated features. The user-password authentication mechanism is still commonly used in most applications today. Understanding a fuzzing scenario Buffer overflow
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