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If the above is stored in the executable file ./check, the shell command ./check " 1 ) evil" will attempt to execute the injected shell command evil instead of comparing the argument with the constant one. Here, the code under attack is the code that is trying to check the parameter, the very code that might have been trying to validate the ...
Hack is designed to interoperate seamlessly with PHP, which is a widely used open-source scripting language that has a focus on web development and can be embedded into HTML. A majority of valid PHP scripts are also valid in Hack; however, many less-often used PHP features and language constructs are unsupported in Hack. [8]
Tflow created a script that Tunisians could use to protect their web browsers from government surveillance, while fellow future LulzSec member Hector Xavier Monsegur (alias "Sabu") and others allegedly hijacked servers from a London web-hosting company to launch a DDoS attack on Tunisian government websites, taking them offline.