One Gadget

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Basic Information

One Gadget allows to obtain a shell instead of using system and "/bin/sh". One Gadget will find inside the libc library some way to obtain a shell (execve("/bin/sh")) using just one address. However, normally there are some constrains, the most common ones and easy to avoid are like [rsp+0x30] == NULL As you control the values inside the RSP you just have to send some more NULL values so the constrain is avoided.

ONE_GADGET = libc.address + 0x4526a
rop2 = base + p64(ONE_GADGET) + "\x00"*100

To the address indicated by One Gadget you need to add the base address where libc is loaded.

One Gadget is a great help for Arbitrary Write 2 Exec techniques and might simplify ROP chains as you only need to call one address (and fulfil the requirements).

ARM64

The github repo mentions that ARM64 is supported by the tool, but when running it in the libc of a Kali 2023.3 it doesn't find any gadget.

Angry Gadget

From the github repo: Inspired by OneGadget this tool is written in python and uses angr to test constraints for gadgets executing execve('/bin/sh', NULL, NULL) If you've run out gadgets to try from OneGadget, Angry Gadget gives a lot more with complicated constraints to try!

pip install angry_gadget

angry_gadget.py examples/libc6_2.23-0ubuntu10_amd64.so 

Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE) Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

Support HackTricks

• Check the subscription plans!

• Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @hacktricks_live.

• Share hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.