Created
August 4, 2024 17:10
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angr-ctf
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def first_check(project): | |
check0_start = base + 0x1211 | |
check0_end = base + 0x12f5 | |
initial_state = project.factory.entry_state( | |
addr = check0_start, | |
add_options = { angr.options.SYMBOL_FILL_UNCONSTRAINED_MEMORY, | |
angr.options.SYMBOL_FILL_UNCONSTRAINED_REGISTERS }) | |
simulation = project.factory.simgr(initial_state) | |
p0 = claripy.BVS('p0', 8 * 8) | |
input0_addr = initial_state.regs.rdi | |
initial_state.memory.store(input0_addr, p0) | |
simulation.explore(find=check0_end) | |
if simulation.found: | |
solution_state = simulation.found[0] | |
print('found!') | |
to_compare_addr = solution_state.regs.rbp - 0x10 | |
constraint_sym = solution_state.memory.load(to_compare_addr, 8) | |
constraint_value = 'Xsl3BDxP'.encode() | |
solution_state.add_constraints(constraint_sym == constraint_value) | |
print(solution_state.solver.eval(constraint_sym,cast_to=bytes)) | |
solution = solution_state.solver.eval(p0,cast_to=bytes) | |
return solution | |
else: | |
raise Exception('Could not find the solution') |
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