patch

Patch Command

The patch command is used for patching container images with vulnerabilities.
It uses copa and buildkit under the hood for patching the container images, and grype as the engine for scanning the images (at the moment).

Usage

kubescape patch --image <image-name> [flags]

The patch command can be run in 2 ways:

1. With sudo privileges

   You will need to start buildkitd if it is not already running

   sudo buildkitd & 
   sudo kubescape patch --image <image-name>
   

2. Without sudo privileges

    export BUILDKIT_VERSION=v0.11.4
    export BUILDKIT_PORT=8888
   
    docker run \
        --detach \
        --rm \
        --privileged \
        -p 127.0.0.1:$BUILDKIT_PORT:$BUILDKIT_PORT/tcp \
        --name buildkitd \
        --entrypoint buildkitd \
        "moby/buildkit:$BUILDKIT_VERSION" \
        --addr tcp://0.0.0.0:$BUILDKIT_PORT
   
    kubescape patch \
        -i <image-name> \
        -a tcp://0.0.0.0:$BUILDKIT_PORT
   

Flags

Example

We will demonstrate how to use the patch command with an example of nginx image.

Pre-requisites

• docker daemon must be installed and running.
• buildkit daemon must be installed

Steps

1. Run buildkitd service:

   sudo buildkitd
   

2. In a seperate terminal, run the kubescape patch command:

   sudo kubescape patch --image docker.io/library/nginx:1.22
   

3. You will get an output like below:

   ✅  Successfully scanned image: docker.io/library/nginx:1.22
   ✅  Patched image successfully. Loaded image: nginx:1.22-patched
   ✅  Successfully re-scanned image: nginx:1.22-patched
   
   | Severity | Vulnerability  | Component     | Version                 | Fixed In |
   | -------- | -------------- | ------------- | ----------------------- | -------- |
   | Critical | CVE-2023-23914 | curl          | 7.74.0-1.3+deb11u7      | wont-fix |
   | Critical | CVE-2019-8457  | libdb5.3      | 5.3.28+dfsg1-0.8        | wont-fix |
   | High     | CVE-2022-42916 | libcurl4      | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2022-1304  | libext2fs2    | 1.46.2-2                | wont-fix |
   | High     | CVE-2022-42916 | curl          | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2022-1304  | e2fsprogs     | 1.46.2-2                | wont-fix |
   | High     | CVE-2022-1304  | libcom-err2   | 1.46.2-2                | wont-fix |
   | High     | CVE-2023-27533 | curl          | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2023-27534 | libcurl4      | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2023-27533 | libcurl4      | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2022-43551 | libcurl4      | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2022-3715  | bash          | 5.1-2+deb11u1           | wont-fix |
   | High     | CVE-2023-27534 | curl          | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2022-43551 | curl          | 7.74.0-1.3+deb11u7      | wont-fix |
   | High     | CVE-2021-33560 | libgcrypt20   | 1.8.7-6                 | wont-fix |
   | High     | CVE-2023-2953  | libldap-2.4-2 | 2.4.57+dfsg-3+deb11u1   | wont-fix |
   | High     | CVE-2022-1304  | libss2        | 1.46.2-2                | wont-fix |
   | High     | CVE-2020-22218 | libssh2-1     | 1.9.0-2                 | wont-fix |
   | High     | CVE-2023-29491 | libtinfo6     | 6.2+20201114-2+deb11u1  | wont-fix |
   | High     | CVE-2022-2309  | libxml2       | 2.9.10+dfsg-6.7+deb11u4 | wont-fix |
   | High     | CVE-2022-4899  | libzstd1      | 1.4.8+dfsg-2.1          | wont-fix |
   | High     | CVE-2022-1304  | logsave       | 1.46.2-2                | wont-fix |
   | High     | CVE-2023-29491 | ncurses-base  | 6.2+20201114-2+deb11u1  | wont-fix |
   | High     | CVE-2023-29491 | ncurses-bin   | 6.2+20201114-2+deb11u1  | wont-fix |
   | High     | CVE-2023-31484 | perl-base     | 5.32.1-4+deb11u2        | wont-fix |
   | High     | CVE-2020-16156 | perl-base     | 5.32.1-4+deb11u2        | wont-fix |
   
   Vulnerability summary - 161 vulnerabilities found:
   Image: nginx:1.22-patched
     * 3 Critical
     * 24 High
     * 31 Medium
     * 103 Other
   
   Most vulnerable components:
     * curl (7.74.0-1.3+deb11u7) - 1 Critical, 4 High, 5 Medium, 1 Low, 3 Negligible
     * libcurl4 (7.74.0-1.3+deb11u7) - 1 Critical, 4 High, 5 Medium, 1 Low, 3 Negligible
     * libtiff5 (4.2.0-1+deb11u4) - 7 Medium, 10 Negligible, 2 Unknown
     * libxml2 (2.9.10+dfsg-6.7+deb11u4) - 1 High, 2 Medium
     * perl-base (5.32.1-4+deb11u2) - 2 High, 2 Negligible
   
   What now?
   ─────────
   * Run with '--verbose'/'-v' flag for detailed vulnerabilities view
   * Install Kubescape in your cluster for continuous monitoring and a full vulnerability report: https://github.com/kubescape/helm-charts/tree/main/charts/kubescape-cloud-operator
   

Limitations

• The patch command can only fix OS-level vulnerability. It cannot fix application-level vulnerabilities. This is a limitation of copa. The reason behind this is that application level vulnerabilities are best suited to be fixed by the developers of the application. Hence, this is not really a limitation but a design decision.
• No support for windows containers given the dependency on buildkit.