GitHub - david942j/one_gadget: The best tool for finding one gadget RCE in libc.so.6

OneGadget

When playing ctf pwn challenges we usually need the one-gadget RCE (remote code execution), which leads to call execve('/bin/sh', NULL, NULL).

This gem provides such gadgets finder, no need to use objdump or IDA-pro every time like a fool 😉

To use this tool, type one_gadget /path/to/libc in command line and enjoy the magic 😆

Installation

Available on RubyGems.org!

$ gem install one_gadget

Note: requires ruby version >= 2.1.0, you can use ruby --version to check.

Supported Architectures

i386
amd64 (x86-64)
aarch64 (ARMv8)

Implementation

OneGadget uses symbolic execution to find the constraints of gadgets to be successful.

The article introducing how I develop this tool can be found on my blog.

Usage

Command Line Interface

$ one_gadget
# Usage: one_gadget <FILE|-b BuildID> [options]
#     -b, --build-id BuildID           BuildID[sha1] of libc.
#     -f, --[no-]force-file            Force search gadgets in file instead of build id first.
#     -l, --level OUTPUT_LEVEL         The output level.
#                                      OneGadget automatically selects gadgets with higher successful probability.
#                                      Increase this level to ask OneGadget show more gadgets it found.
#                                      Default: 0
#     -n, --near FUNCTIONS/FILE        Order gadgets by their distance to the given functions or to the GOT functions of the given file.
#     -o, --output-format FORMAT       Output format. FORMAT should be one of <pretty|raw|json>.
#                                      Default: pretty
#     -r, --raw                        Alias of -o raw. Output gadgets offset only, split with one space.
#     -s, --script exploit-script      Run exploit script with all possible gadgets.
#                                      The script will be run as 'exploit-script $offset'.
#         --info BuildID               Show version information given BuildID.
#         --base BASE_ADDRESS          The base address of libc.
#                                      Default: 0
#         --version                    Current gem version.

$ one_gadget /lib/x86_64-linux-gnu/libc.so.6
# 0xe3afe execve("/bin/sh", r15, r12)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3b01 execve("/bin/sh", r15, rdx)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3b04 execve("/bin/sh", rsi, rdx)
# constraints:
#   [rsi] == NULL || rsi == NULL || rsi is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp

Given BuildID

$ one_gadget -b aad7dbe330f23ea00ca63daf793b766b51aceb5d
# 0x4557a execve("/bin/sh", rsp+0x30, environ)
# constraints:
#   [rsp+0x30] == NULL || {[rsp+0x30], [rsp+0x38], [rsp+0x40], [rsp+0x48], ...} is a valid argv
#
# 0xf1651 execve("/bin/sh", rsp+0x40, environ)
# constraints:
#   [rsp+0x40] == NULL || {[rsp+0x40], [rsp+0x48], [rsp+0x50], [rsp+0x58], ...} is a valid argv
#
# 0xf24cb execve("/bin/sh", rsp+0x60, environ)
# constraints:
#   [rsp+0x60] == NULL || {[rsp+0x60], [rsp+0x68], [rsp+0x70], [rsp+0x78], ...} is a valid argv

Gadgets Near Functions

Why

Consider this scenario when exploiting:

Able to write on GOT (Global Offset Table)
Base address of libc is unknown

In this scenario you can choose to write two low-byte on a GOT entry with one-gadget's two low-byte. If the function offset on GOT is close enough with the one-gadget, you will have at least 1/16 chance of success.

Usage

Reorder gadgets according to the distance of given functions.

$ one_gadget /lib/x86_64-linux-gnu/libc.so.6 --near exit,mkdir
# [OneGadget] Gadgets near exit(0x46a40):
# 0xe3afe execve("/bin/sh", r15, r12)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3b01 execve("/bin/sh", r15, rdx)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3b04 execve("/bin/sh", rsi, rdx)
# constraints:
#   [rsi] == NULL || rsi == NULL || rsi is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# [OneGadget] Gadgets near mkdir(0x10de70):
# 0xe3b04 execve("/bin/sh", rsi, rdx)
# constraints:
#   [rsi] == NULL || rsi == NULL || rsi is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3b01 execve("/bin/sh", r15, rdx)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3afe execve("/bin/sh", r15, r12)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#

Regular expression is acceptable.

$ one_gadget /lib/x86_64-linux-gnu/libc.so.6 --near 'write.*' --raw
# [OneGadget] Gadgets near writev(0x114690):
# 932612 932609 932606
#
# [OneGadget] Gadgets near write(0x10e280):
# 932612 932609 932606
#

Pass an ELF file as the argument, OneGadget will take all GOT functions for processing.

$ one_gadget /lib/x86_64-linux-gnu/libc.so.6 --near spec/data/test_near_file.elf --raw
# [OneGadget] Gadgets near exit(0x46a40):
# 932606 932609 932612
#
# [OneGadget] Gadgets near puts(0x84420):
# 932606 932609 932612
#
# [OneGadget] Gadgets near printf(0x61c90):
# 932606 932609 932612
#
# [OneGadget] Gadgets near strlen(0x9f630):
# 932606 932609 932612
#
# [OneGadget] Gadgets near __cxa_finalize(0x46f10):
# 932606 932609 932612
#
# [OneGadget] Gadgets near __libc_start_main(0x23f90):
# 932606 932609 932612
#

Show All Gadgets

Sometimes one_gadget finds too many gadgets to show them in one screen, by default gadgets would be filtered automatically according to the difficulty of constraints.

Use option --level 1 to show all gadgets found instead of only those with higher probabilities.

$ one_gadget /lib/x86_64-linux-gnu/libc.so.6 --level 1
# 0x51dfb posix_spawn(rsp+0xc, "/bin/sh", 0, rbp, rsp+0x50, environ)
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   {"sh", "-c", rbx, NULL} is a valid argv
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e02 posix_spawn(rsp+0xc, "/bin/sh", 0, rbp, rsp+0x50, environ)
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   rax == NULL || {"sh", rax, rbx, NULL} is a valid argv
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e09 posix_spawn(rsp+0xc, "/bin/sh", 0, rbp, rsp+0x50, environ)
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, rax, rbx, NULL} is a valid argv
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e10 posix_spawn(rsp+0xc, "/bin/sh", rdx, rbp, rsp+0x50, environ)
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, (u64)xmm1, rbx, NULL} is a valid argv
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e15 posix_spawn(rsp+0xc, "/bin/sh", rdx, rbp, rsp+0x50, environ)
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   (u64)xmm0 == NULL || {(u64)xmm0, (u64)xmm1, rbx, NULL} is a valid argv
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e25 posix_spawn(rdi, "/bin/sh", rdx, rbp, rsp+0x50, [rax])
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   (u64)xmm0 == NULL || {(u64)xmm0, (u64)(xmm0 >> 64), rbx, NULL} is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e2a posix_spawn(rdi, "/bin/sh", rdx, rbp, r8, [rax])
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   [r8] == NULL || r8 is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rbp == NULL || (u16)[rbp] == NULL
#
# 0x51e2d posix_spawn(rdi, "/bin/sh", rdx, rcx, r8, [rax])
# constraints:
#   address rsp+0x60 is writable
#   rsp & 0xf == 0
#   [r8] == NULL || r8 is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rcx == NULL || (u16)[rcx] == NULL
#
# 0x51e32 posix_spawn(rdi, "/bin/sh", rdx, rcx, r8, [rax])
# constraints:
#   address rsp+0x68 is writable
#   rsp & 0xf == 0
#   [r8] == NULL || r8 is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rcx == NULL || (u16)[rcx] == NULL
#
# 0x84135 posix_spawn(rbx+0xe0, "/bin/sh", r12, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x70 is writable
#   rsp & 0xf == 0
#   {"sh", "-c", rbp, NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   r12 == NULL || (s32)[r12+0x4] <= 0
#
# 0x8413c posix_spawn(rbx+0xe0, "/bin/sh", r12, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x70 is writable
#   rsp & 0xf == 0
#   rax == NULL || {"sh", rax, rbp, NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   r12 == NULL || (s32)[r12+0x4] <= 0
#
# 0x84143 posix_spawn(rbx+0xe0, "/bin/sh", r12, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x70 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, rax, rbp, NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   r12 == NULL || (s32)[r12+0x4] <= 0
#
# 0x84146 posix_spawn(rbx+0xe0, "/bin/sh", rdx, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x70 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, rax, rbp, NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#
# 0x8414b posix_spawn(rbx+0xe0, "/bin/sh", rdx, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, rax, [rsp+0x70], NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#
# 0x84150 posix_spawn(rbx+0xe0, "/bin/sh", rdx, 0, rsp+0x60, environ)
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   rcx == NULL || {rcx, (u64)xmm1, [rsp+0x70], NULL} is a valid argv
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#
# 0x8415c posix_spawn(rbx+0xe0, "/bin/sh", rdx, 0, rsp+0x60, [rax])
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   (u64)xmm0 == NULL || {(u64)xmm0, (u64)xmm1, [rsp+0x70], NULL} is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#
# 0x84162 posix_spawn(rbx+0xe0, "/bin/sh", rdx, rcx, rsp+0x60, [rax])
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   (u64)xmm0 == NULL || {(u64)xmm0, (u64)(xmm0 >> 64), [rsp+0x70], NULL} is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rbx+0xe0 == NULL || writable: rbx+0xe0
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rcx == NULL || (u16)[rcx] == NULL
#
# 0x84169 posix_spawn(rdi, "/bin/sh", rdx, rcx, rsp+0x60, [rax])
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   (u64)xmm0 == NULL || {(u64)xmm0, (u64)(xmm0 >> 64), [rsp+0x70], NULL} is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rcx == NULL || (u16)[rcx] == NULL
#
# 0x84170 posix_spawn(rdi, "/bin/sh", rdx, rcx, r8, [rax])
# constraints:
#   address rsp+0x78 is writable
#   rsp & 0xf == 0
#   [r8] == NULL || r8 is a valid argv
#   [[rax]] == NULL || [rax] == NULL || [rax] is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#   rcx == NULL || (u16)[rcx] == NULL
#
# 0xe3afe execve("/bin/sh", r15, r12)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3b01 execve("/bin/sh", r15, rdx)
# constraints:
#   [r15] == NULL || r15 == NULL || r15 is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3b04 execve("/bin/sh", rsi, rdx)
# constraints:
#   [rsi] == NULL || rsi == NULL || rsi is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3cf3 execve("/bin/sh", r10, r12)
# constraints:
#   address rbp-0x78 is writable
#   [r10] == NULL || r10 == NULL || r10 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3cf6 execve("/bin/sh", r10, rdx)
# constraints:
#   address rbp-0x78 is writable
#   [r10] == NULL || r10 == NULL || r10 is a valid argv
#   [rdx] == NULL || rdx == NULL || rdx is a valid envp
#
# 0xe3d62 execve("/bin/sh", rbp-0x50, r12)
# constraints:
#   address rbp-0x48 is writable
#   r13 == NULL || {"/bin/sh", r13, NULL} is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3d69 execve("/bin/sh", rbp-0x50, r12)
# constraints:
#   address rbp-0x48 is writable
#   rax == NULL || {rax, r13, NULL} is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3d70 execve("/bin/sh", rbp-0x50, r12)
# constraints:
#   address rbp-0x50 is writable
#   rax == NULL || {rax, [rbp-0x48], NULL} is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3da7 execve("/bin/sh", rbp-0x50, r12)
# constraints:
#   address rbp-0x50 is writable
#   [rbp-0x68] == NULL || {"/bin/sh", [rbp-0x68], NULL} is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3db1 execve("/bin/sh", rbp-0x50, r12)
# constraints:
#   address rbp-0x50 is writable
#   rax == NULL || {rax, [rbp-0x68], NULL} is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3db5 execve("/bin/sh", r10, r12)
# constraints:
#   addresses r10+0x10, rbp-0x50 are writable
#   [r10] == NULL || r10 == NULL || r10 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0xe3dbd execve("/bin/sh", r10, r12)
# constraints:
#   addresses r10+0x10, rbp-0x48 are writable
#   [r10] == NULL || r10 == NULL || r10 is a valid argv
#   [r12] == NULL || r12 == NULL || r12 is a valid envp
#
# 0x1077ca posix_spawn(rsp+0x64, "/bin/sh", [rsp+0x38], 0, rsp+0x70, [rsp+0xf0])
# constraints:
#   [rsp+0x70] == NULL || {[rsp+0x70], [rsp+0x78], [rsp+0x80], [rsp+0x88], ...} is a valid argv
#   [[rsp+0xf0]] == NULL || [rsp+0xf0] == NULL || [rsp+0xf0] is a valid envp
#   [rsp+0x38] == NULL || (s32)[[rsp+0x38]+0x4] <= 0
#
# 0x1077d2 posix_spawn(rsp+0x64, "/bin/sh", [rsp+0x38], 0, rsp+0x70, r9)
# constraints:
#   [rsp+0x70] == NULL || {[rsp+0x70], [rsp+0x78], [rsp+0x80], [rsp+0x88], ...} is a valid argv
#   [r9] == NULL || r9 == NULL || r9 is a valid envp
#   [rsp+0x38] == NULL || (s32)[[rsp+0x38]+0x4] <= 0
#
# 0x1077d7 posix_spawn(rsp+0x64, "/bin/sh", rdx, 0, rsp+0x70, r9)
# constraints:
#   [rsp+0x70] == NULL || {[rsp+0x70], [rsp+0x78], [rsp+0x80], [rsp+0x88], ...} is a valid argv
#   [r9] == NULL || r9 == NULL || r9 is a valid envp
#   rdx == NULL || (s32)[rdx+0x4] <= 0
#
# 0x1077e1 posix_spawn(rdi, "/bin/sh", rdx, 0, r8, r9)
# constraints:
#   [r8] == NULL || r8 is a valid argv
#   [r9] == NULL || r9 == NULL || r9 is a valid envp
#   rdi == NULL || writable: rdi
#   rdx == NULL || (s32)[rdx+0x4] <= 0

Other Architectures

i386

$ one_gadget /lib32/libc.so.6
# 0xc890b execve("/bin/sh", [ebp-0x2c], esi)
# constraints:
#   address ebp-0x20 is writable
#   ebx is the GOT address of libc
#   [[ebp-0x2c]] == NULL || [ebp-0x2c] == NULL || [ebp-0x2c] is a valid argv
#   [esi] == NULL || esi == NULL || esi is a valid envp
#
# 0x1421b3 execl("/bin/sh", eax)
# constraints:
#   ebp is the GOT address of libc
#   eax == NULL
#
# 0x1421b4 execl("/bin/sh", [esp])
# constraints:
#   ebp is the GOT address of libc
#   [esp] == NULL

AArch64

$ one_gadget spec/data/aarch64-libc-2.27.so
# 0x3f160 execve("/bin/sh", sp+0x70, environ)
# constraints:
#   address x20+0x338 is writable
#   x3 == NULL
#
# 0x3f184 execve("/bin/sh", sp+0x70, environ)
# constraints:
#   addresses x19+0x4, x20+0x338 are writable
#   [sp+0x70] == NULL
#
# 0x3f1a8 execve("/bin/sh", x21, environ)
# constraints:
#   addresses x19+0x4, x20+0x338 are writable
#   [x21] == NULL || x21 == NULL
#
# 0x63e90 execl("/bin/sh", x1)
# constraints:
#   x1 == NULL

Combine with Script

Pass your exploit script as one_gadget's arguments, it can try all gadgets one by one, so you don't need to try every possible gadgets manually.

$ one_gadget ./spec/data/libc-2.19.so -s 'echo "offset ->"'

In Ruby Scripts

require 'one_gadget'
OneGadget.gadgets(file: '/lib/x86_64-linux-gnu/libc.so.6')
#=> [932606, 932609, 932612]

# or in shorter way
one_gadget('/lib/x86_64-linux-gnu/libc.so.6', level: 1)
#=> [335355, 335362, 335369, 335376, 335381, 335397, 335402, 335405, 335410, 540981, 540988, 540995, 540998, 541003, 541008, 541020, 541026, 541033, 541040, 932606, 932609, 932612, 933107, 933110, 933218, 933225, 933232, 933287, 933297, 933301, 933309, 1079242, 1079250, 1079255, 1079265]

# from build id
one_gadget('b417c0ba7cc5cf06d1d1bed6652cedb9253c60d0')
#=> [324286, 324293, 324386, 1090444]

To Python Lovers

import subprocess
def one_gadget(filename):
  return [int(i) for i in subprocess.check_output(['one_gadget', '--raw', filename]).decode().split(' ')]

one_gadget('/lib/x86_64-linux-gnu/libc.so.6')
#=> [932606, 932609, 932612]

Make OneGadget Better

Any suggestion or feature request is welcome! Feel free to send a pull request.

Please let me know if you find any libc that make OneGadget fail to find gadgets. And, if you like this work, I'll be happy to be starred 😬

Name		Name	Last commit message	Last commit date
Latest commit History 300 Commits
.github		.github
bin		bin
examples		examples
lib		lib
spec		spec
tasks		tasks
.codeclimate.yml		.codeclimate.yml
.gitignore		.gitignore
.rspec		.rspec
.rubocop.yml		.rubocop.yml
Gemfile		Gemfile
Gemfile.lock		Gemfile.lock
LICENSE		LICENSE
README.md		README.md
README.tpl.md		README.tpl.md
Rakefile		Rakefile
builds_list		builds_list
one_gadget.gemspec		one_gadget.gemspec

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OneGadget

Installation

Supported Architectures

Implementation

Usage

Command Line Interface

Given BuildID

Gadgets Near Functions

Why

Usage

Show All Gadgets

Other Architectures

i386

AArch64

Combine with Script

In Ruby Scripts

To Python Lovers

Make OneGadget Better

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OneGadget

Installation

Supported Architectures

Implementation

Usage

Command Line Interface

Given BuildID

Gadgets Near Functions

Why

Usage

Show All Gadgets

Other Architectures

i386

AArch64

Combine with Script

In Ruby Scripts

To Python Lovers

Make OneGadget Better

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Releases 30

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Contributors 9

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