beebug: A tool for checking exploitability

beebug

beebug is a tool that can be used to verify if a program crash could be exploitable.

This tool was presented at r2con 2018 in Barcelona.

Some implemented functionality are:

  • Stack overflow on libc
  • Crash on Program Counter
  • Crash on branch
  • Crash on write memory
  • Heap vulnerabilities
  • Read access violation (some exploitable cases)
  • Help to analyze a crash (graph view)

Installation

~ $ wget https://github.com/radare/radare2/archive/2.7.0.tar.gz
~ $ tar xzvf 2.7.0.tar.gz
~ $ cd radare2-2.7.0/
~/radare2-2.7.0 $ ./configure –prefix=/usr
~/radare2-2.7.0 $ make -j8
~/radare2-2.7.0 $ sudo make install
# apt-get install graphviz
# pip3 install -r requirements.txt

Usage

# python3 ./beebug.py -h
usage: beebug.py [-h] -t TARGET [-a TARGETARGS] [-f FILE] [-g GRAPH]

optional arguments:
  -h, --help            show this help message and exit
  -t TARGET, --target TARGET
                        target program to analyze
  -a TARGETARGS, --targetargs TARGETARGS
                        arguments for the target program
  -f FILE, --file FILE  input file
  -g GRAPH, --graph GRAPH
                        generate the graph

 

Example

# python3 ./beebug.py -t tests/crash_on_pc
Process with PID 7691 started...
File dbg:///home/invictus1306/Documents/r2conf/beebug/beebug/tests/crash_on_pc  reopened in read-write mode
= attach 7691 7691
child stopped with signal 11
[+] SIGNAL 11 errno=0 addr=0x00601038 code=2 ret=0
Crash on PC - Generally it is exploitable, the PC could be tainted
backtrace
0  0x601038           sp: 0x0                 0    [??]  obj.foo obj.foo0
1  0x4004f1           sp: 0x7ffdfa75d8e8      0    [sym.main]  main+27 
2  0x7f2669d00830     sp: 0x7ffdfa75d908      32   [??]  r11+240 
3  0x7f266a0ba7cb     sp: 0x7ffdfa75d998      144  [??]  sym.dl_rtld_di_serinfo+29051 
4  0x400409           sp: 0x7ffdfa75d9c8      48   [??]  entry0+41
registers
rax = 0x00601038
rbx = 0x00000000
rcx = 0x00000000
rdx = 0x7ffdfa75d9f8
r8 = 0x00400570
r9 = 0x7f266a0baab0
r10 = 0x00000846
r11 = 0x7f2669d00740
r12 = 0x004003e0
r13 = 0x7ffdfa75d9e0
r14 = 0x00000000
r15 = 0x00000000
rsi = 0x7ffdfa75d9e8
rdi = 0x0000000a
rsp = 0x7ffdfa75d8e8
rbp = 0x7ffdfa75d900
rip = 0x00601038
rflags = 0x00010206
orax = 0xffffffffffffffff

 

Graph generation

# python3 ./beebug.py -t tests/crash_on_pc -g crash_on_pc
...
# display crash_on_pc.png

 

beebug

Copyright (C) 2018 invictus1306

Source: https://github.com/invictus1306/

Share