SUID Shell Wrapper

Use the suid-shell to drop shell (/bin/sh) as the executable's owner (setuid). Use setuid-wrapper to run command with privileges of the executable's owner.

Compiling

Self compile using the command:

gcc -s -static -O3 -o suid-shell suid-shell.c

Download

Download pre-compiled binary from release. MD5sum:

c54dddc1be85fe984f689fca5fef9f5a  suid-shell-x64
824317b7e3079daca242081bc5f22cc1  suid-shell-x86
bcbe305d409e87126565cd1e1e556703  setuid-wrapper-x86
130645a46a86f1f772709cd1ecb93307  setuid-wrapper-x64

x86 Architecture

suid-shell-x86: ELF 32-bit LSB executable, Intel 80386, version 1 (GNU/Linux), statically linked,
for GNU/Linux 2.6.32, BuildID[sha1]=973f85925a0b0bc69181d59dc3d0e77823583c2c, stripped

setuid-wrapper-x86: ELF 32-bit LSB executable, Intel 80386, version 1 (GNU/Linux), statically linked,
for GNU/Linux 2.6.32, BuildID[sha1]=fb56045215b56a4e260af22df1c577c8d47a17dd, stripped

x64 Architecture

suid-shell-x64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked,
for GNU/Linux 2.6.32, BuildID[sha1]=4164de1d848943112efa31ce641235ebc6e64783, stripped

setuid-wrapper-x64: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked,
for GNU/Linux 2.6.32, BuildID[sha1]=586a22851cdbfcae869d1e8e44a32cf8a1e1819a, stripped

Pre-compiled binary environment

Build system: x86

$ uname -a
Linux debian 4.9.0-16-686 #1 SMP Debian 4.9.272-2 (2021-07-19) i686 GNU/Linux
$ lsb_release -a
Distributor ID:	Debian
Description:	Debian GNU/Linux 9.13 (stretch)
Release:	9.13
Codename:	stretch
$ gcc --version
gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516

Build system: x64

$ uname -a
Linux debian 4.9.0-16-amd64 #1 SMP Debian 4.9.272-2 (2021-07-19) x86_64 GNU/Linux
$ lsb_release -a
Distributor ID:	Debian
Description:	Debian GNU/Linux 9.13 (stretch)
Release:	9.13
Codename:	stretch
$ gcc --version
gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516

Usage

Instantly drop shell (/bin/sh): suid-shell

chown root:root suid-shell-x64
chmod 4755 suid-shell-x64
./suid-shell-x64
# id
uid=0(root) gid=0(root) groups=0(root)

Run command with elevated privileges in wrapper. setuid-wrapper <command>

chown root:root setuid-wrapper-x64
chmod 4755 setuid-wrapper-x64
./setuid-wrapper-x64 id
uid=0(root) gid=0(root) groups=0(root)