You can make use of the UTF locator to discover bugs on applications that accept user supplied input. In UTF-8, characters are encoded using sequences of 1 to 6 octets. The only octet of a "sequence" of one has the higher-order bit set to 0, the remaining 7 bits being used to encode the character value. In a sequence of n octets, n1, the initial octet has the n higher-order bits set to 1, followed by a bit set to 0. The remaining bit(s) of that octet contain bits from the value of the character to be encoded. The following octet(s) all have the higher-order bit set to 1 and the following bit set to 0, leaving 6 bits in each to contain bits from the character to be encoded.
In a nutshell this UTF locator could be used to trigger encoding/decoding issues among applications, that could later on after or pre processing trigger different types of behaviors, and it depends on the application and platform how this is handled.
- Fill the message to include ( optional ) and use the default amount "10.000" or change it for more or less. Click on Create UTF to run it. This action will create a file called utflocator.txt and show you also the content of the file, from here just copy the file to his destination or copy the content and add it to an user supplied input to trigger, or try to, a vulnerability.