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Update tj-actions/changed-files action to v41 [SECURITY] - autoclosed #161

Merged
merged 1 commit into from
Feb 7, 2024
Merged

Update tj-actions/changed-files action to v41 [SECURITY] - autoclosed #161

merged 1 commit into from
Feb 7, 2024

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renovate[bot]
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@renovate renovate bot commented Feb 7, 2024

Mend Renovate

This PR contains the following updates:

Package Type Update Change
tj-actions/changed-files action major v40 -> v41

GitHub Vulnerability Alerts

CVE-2023-51664

Summary

The tj-actions/changed-files workflow allows for command injection in changed filenames, allowing an attacker to execute arbitrary code and potentially leak secrets.

Details

The changed-files action returns a list of files changed in a commit or pull request which provides an escape_json input enabled by default, only escapes " for JSON values.

This could potentially allow filenames that contain special characters such as ; and ` (backtick) which can be used by an attacker to take over the GitHub Runner if the output value is used in a raw fashion (thus being directly replaced before execution) inside a run block. By running custom commands an attacker may be able to steal secrets such as GITHUB_TOKEN if triggered on other events than pull_request. For example on push.

Proof of Concept

  1. Submit a pull request to a repository with a new file injecting a command. For example $(whoami).txt which is a valid filename.
  2. Upon approval of the workflow (triggered by the pull request), the action will get executed and the malicious pull request filename will flow into the List all changed files step below.
      - name: List all changed files
        run: |
          for file in $; do
            echo "$file was changed"
          done

Example output:

##[group]Run for file in $(whoami).txt; do
    for file in $(whoami).txt; do
        echo "$file was changed"
    done
shell: /usr/bin/bash -e {0}

##[endgroup]
runner.txt was changed

Impact

This issue may lead to arbitrary command execution in the GitHub Runner.

Resolution

  • A new safe_output input would be enabled by default and return filename paths escaping special characters like ;, ` (backtick), $, (), etc for bash environments.

  • A safe recommendation of using environment variables to store unsafe outputs.

- name: List all changed files
  env:
    ALL_CHANGED_FILES: $
  run: |
    for file in "$ALL_CHANGED_FILES"; do
      echo "$file was changed"
    done

Resources

Release Notes

tj-actions/changed-files (tj-actions/changed-files)

v41

Compare Source

Changes in v41.1.2
What's Changed

Full Changelog: tj-actions/changed-files@v41...v41.1.2

Changes in v41.1.1
What's Changed

Full Changelog: tj-actions/changed-files@v41...v41.1.1

Changes in v41.1.0
What's Changed

Full Changelog: tj-actions/changed-files@v41...v41.1.0

Changes in v41.0.1
What's Changed

Full Changelog: tj-actions/changed-files@v41...v41.0.1

Changes in v41.0.0
🔥 🔥 BREAKING CHANGE 🔥 🔥

A new safe_output input is now available to prevent outputting unsafe filename characters (Enabled by default). This would escape characters in the filename that could be used for command injection.

[!NOTE]
This can be disabled by setting the safe_output to false this comes with a recommendation to store all outputs generated in an environment variable first before using them.

Example
...
    - name: Get changed files
      id: changed-files
      uses: tj-actions/changed-files@v40
      with:
        safe_output: false # set to false because we are using an environment variable to store the output and avoid command injection.

    - name: List all added files
      env:
        ADDED_FILES: ${{ steps.changed-files.outputs.added_files }}
      run: |
        for file in "$ADDED_FILES"; do
          echo "$file was added"
        done
...
What's Changed

Full Changelog: tj-actions/changed-files@v40...v41.0.0

Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

  • If you want to rebase/retry this PR, check this box

This PR has been generated by Mend Renovate. View repository job log here.

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Unable to locate .performanceTestingBot config file

@secure-code-warrior-for-github Secure Code Warrior for GitHub
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Micro-Learning Topic: OS command injection (Detected by phrase)

Matched on "command injection"

What is this? (2min video)

In many situations, applications will rely on OS provided functions, scripts, macros and utilities instead of reimplementing them in code. While functions would typically be accessed through a native interface library, the remaining three OS provided features will normally be invoked via the command line or launched as a process. If unsafe inputs are used to construct commands or arguments, it may allow arbitrary OS operations to be performed that can compromise the server.

Try a challenge in Secure Code Warrior

Helpful references
  • OWASP Command Injection - OWASP community page with comprehensive information about command injection, and links to various OWASP resources to help detect or prevent it.
  • OWASP testing for Command Injection - This article is focused on providing testing techniques for identifying command injection flaws in your applications

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difflens bot commented Feb 7, 2024

View changes in DiffLens

@pull-request-quantifier-deprecated Pull Request Quantifier (deprecated)
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This PR has 2 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

Quantification details 

Label      : Extra Small
Size       : +1 -1
Percentile : 0.8%

Total files changed: 1

Change summary by file extension:
.yml : +1 -1

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

Why proper sizing of changes matters

Optimal pull request sizes drive a better predictable PR flow as they strike a
balance between between PR complexity and PR review overhead. PRs within the
optimal size (typical small, or medium sized PRs) mean:

  • Fast and predictable releases to production:
    • Optimal size changes are more likely to be reviewed faster with fewer
      iterations.
    • Similarity in low PR complexity drives similar review times.
  • Review quality is likely higher as complexity is lower:
    • Bugs are more likely to be detected.
    • Code inconsistencies are more likely to be detected.
  • Knowledge sharing is improved within the participants:
    • Small portions can be assimilated better.
  • Better engineering practices are exercised:
    • Solving big problems by dividing them in well contained, smaller problems.
    • Exercising separation of concerns within the code changes.

What can I do to optimize my changes

  • Use the PullRequestQuantifier to quantify your PR accurately
    • Create a context profile for your repo using the context generator
    • Exclude files that are not necessary to be reviewed or do not increase the review complexity. Example: Autogenerated code, docs, project IDE setting files, binaries, etc. Check out the Excluded section from your prquantifier.yaml context profile.
    • Understand your typical change complexity, drive towards the desired complexity by adjusting the label mapping in your prquantifier.yaml context profile.
    • Only use the labels that matter to you, see context specification to customize your prquantifier.yaml context profile.
  • Change your engineering behaviors
    • For PRs that fall outside of the desired spectrum, review the details and check if:
      • Your PR could be split in smaller, self-contained PRs instead
      • Your PR only solves one particular issue. (For example, don't refactor and code new features in the same PR).

How to interpret the change counts in git diff output

  • One line was added: +1 -0
  • One line was deleted: +0 -1
  • One line was modified: +1 -1 (git diff doesn't know about modified, it will
    interpret that line like one addition plus one deletion)
  • Change percentiles: Change characteristics (addition, deletion, modification)
    of this PR in relation to all other PRs within the repository.

Was this comment helpful? 👍  :ok_hand:  :thumbsdown: (Email)
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Thanks for opening this Pull Request!
We need you to:

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    Action: Edit description and replace <!- ... --> with actual values.

  2. Complete the activities.

    Action: Complete If you want to rebase/retry this PR, check this box

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@AdamOswald AdamOswald merged commit 461be82 into main Feb 7, 2024
11 of 14 checks passed
@AdamOswald AdamOswald deleted the renovate/github-tags-tj-actions/changed-files-vulnerability branch February 7, 2024 19:35
@renovate renovate bot changed the title Update tj-actions/changed-files action to v41 [SECURITY] Update tj-actions/changed-files action to v41 [SECURITY] - autoclosed Feb 7, 2024
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