Angrgdb – Use Angr Inside GDB – Create An Angr State From The Current Debugger State

Use angr inside GDB. Create an angr state from the current debugger state.

Install

pip install angrgdb
echo "python import angrgdb.commands" >> ~/.gdbinit

Usage
angrgdb implements the angrdbg API in GDB.
You can use it in scripts like this:

from angrgdb import *

gdb.execute("b *0x004005f9")
gdb.execute("r aaaaaaaa")

sm = StateManager()
sm.sim(sm["rax"], 100)

m = sm.simulation_manager()
m.explore(find=0x00400607, avoid=0x00400613)

sm.to_dbg(m.found[0]) #write input to GDB

gdb.execute("x/s $rax")
#0x7fffffffe768: "ais3{I_tak3_g00d_n0t3s}"
gdb.execute("c")
#Correct! that is the secret key!

You can also use angrgdb commands directly in GDB for simple stuffs:

  • angrgdb sim <register name> [size] Symbolize a register
  • angrgdb sim <address> [size] Symbolize a memory area
  • angrgdb list List all items that you setted as symbolic
  • angrgdb find <address0> <address1> ... <addressN> Set the list of find targets
  • angrgdb avoid <address0> <address1> ... <addressN> Set the list of avoid targets
  • angrgdb reset Reset the context (symbolic values and targets)
  • angrgdb run Generate a state from the debugger state and run the exploration
  • angrgdb shell Open an shell with a StateManager instance created from the current GDB state
  • angrgdb interactive Generate a state from the debugger state and explore by hand using a modified version of angr-cli

An example crackme solve using angrgdb+GEF+idb2gdb:

Loading scripts in GDB
This is a tip if you don’t want to use angrgdb from the cli but you want to use a python script. To load a script in GDB use source script.py.

TODO

  • add remote angrdbg like in IDAngr
Download Angrgdb
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