Pwngdb

Develop my own GDB for pwn.

Install

$ wget -q -O- https://raw.githubusercontent.com/bash-c/Pwngdb/master/install.sh | sh

install

If you dont want to use gdb-peda , you can modify the gdbinit to remove it.

I prefer pwndbg so I modified the .gdbinit to using pwndbg.

Heapinfo

If you want to use the feature of heapinfo and tracemalloc , you need to install libc debug file (libc6-dbg & libc6-dbg:i386 for debian package)

Features from Pwngdb

• canary: Print the canary of using function
• ld : Print the base address of ld
• at : Attach by process name
• libcbase : Print the base address of libc
• codebase : Print the base of code segment
• heapbase : Print the base of heap
• dyn : Print the Dynamic section infomation
• findcall : Find some function call
• bcall : Set the breakpoint at some function call
• tls : Print the thread local storage address
• findsyscall : Find the syscall
• fmtarg : Calculate the index of format string
  • You need to stop on printf which has vulnerability.
• force : Calculate the nb in the house of force.
• heapinfo : Print some infomation of heap
  • heapinfo (Address of arena)
  • default is the arena of current thread
  • If tcache is enable, it would show infomation of tcache entry
• heapinfoall : Print some infomation of heap (all threads)
• arenainfo : Print some infomation of all arena
• chunkinfo: Print the infomation of chunk
  • chunkinfo (Address of victim)
• chunkptr : Print the infomation of chunk
  • chunkptr (Address of user ptr)
• mergeinfo : Print the infomation of merge
  • mergeinfo (Address of victim)
• printfastbin : Print some infomation of fastbin
• tracemalloc on : Trace the malloc and free and detect some error .
  • You need to run the process first than tracemalloc on, it will record all of the malloc and free.
  • You can set the DEBUG in pwngdb.py , than it will print all of the malloc and free infomation such as the screeshot.
• parseheap : Parse heap layout
• magic : Print useful variable and function in glibc
• fp : show FILE structure
  • fp (Address of FILE)
• fpchain: show linked list of FILE
• orange : Test house of orange condition in the _IO_flush_lockp
  • orange (Address of FILE)
  • glibc version <= 2.23

Features from pwndbg

• got : Print the Global Offset Table infomation
• fake_fastbin_all : find all the fake fastbin of a given address
• bpie: set breakpoint when PIE enabled. eg: bpie 0x980

Screenshot

• Chunkinfo

• Mergeinfo

• Heapinfo

• Heapinfoall

• parseheap

• tracemalloc

• magic