Jay Bosamiya Software Security Researcher

Blog - page 2


Return Oriented Programming

Return Oriented Programming (ROP) is one of the classic exploitation techniques, that is used to bypass the NX (non executable memory) protection. Microsoft has incorporated NX as DEP (data execution prevention). Even Linux etc, have it effective, which means that with this protection, you could no longer place shellcode onto heap/stack and have it execute just by jumping to it. So now, to be able to execute code, you jump into pre-existing code (main binary,... Read more...

Genetic Fuzzing

Here, we take a look at "advanced" fuzzing (in comparison to a blind fuzzer, as described in my "Basics of Fuzzing" note). While it also modifies/mutates bytes etc, but it does so in a slightly smarter way than the blind "dumb" fuzzer. Read more...

Basics of Fuzzing

What is a fuzzer, in the first place? And why do we use it? Read more...

Exploitation Abstraction

Of course, when programming, all of us use abstractions, whether they be classes and objects, or functions, or meta-functions, or polymorphism, or monads, or functors, or all that jazz. However, can we really have such a thing during exploitation? Obviously, we can exploit mistakes that are made in implementing the aforementioned abstractions, but here, I am talking about something different. Read more...

"Advanced" Format String Exploitation

While simple format string vulnerabilities are becoming relatively less common these days, every once in a while, we come across some interesting cases in either CTFs or (less likely) real world programs, where having a better understanding of how to attack these vulnerabilities helps immensely. Read more...