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I'm new to Linux operating system. Last day, I practice "heap exploitation", and they give me an elf file, and a "libc.so.6" file, and they said I must debug/exploit with that libc file, but I don't know how to use it.

I try to run the elf file, and I receive "Illegal instruction (core dumped)". After googling, I try with LD_PRELOAD, LD_LIBRARY_PATH but no luck. I'm using LUbuntu 18.04.

So can you guys help me with this case ? Thanks in advance !

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I can almost guarantee 'they' are wanting you to perform a return to libc exploit.

Some good references

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