chore(deps): update tj-actions/changed-files action to v41 [security]

[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

• Keeping your GitHub Actions and workflows secure Part 2: Untrusted input
• Keeping your GitHub Actions and workflows secure Part 1: Preventing pwn requests

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Release Notes

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

v41

Compare Source

Changes in v41.0.1

What's Changed

• Upgraded to v41 by @​tj-actions-bot in https://github.com/tj-actions/changed-files/pull/1811
• chore(deps): update dependency eslint-plugin-prettier to v5.1.2 by @​renovate in https://github.com/tj-actions/changed-files/pull/1813
• fix: update characters escaped by safe output by @​jackton1 in https://github.com/tj-actions/changed-files/pull/1815

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

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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

• chore(deps): update typescript-eslint monorepo to v6.15.0 by @​renovate in https://github.com/tj-actions/changed-files/pull/1801
• Upgraded to v40.2.3 by @​tj-actions-bot in https://github.com/tj-actions/changed-files/pull/1800
• chore(deps): update dependency eslint-plugin-prettier to v5.1.0 by @​renovate in https://github.com/tj-actions/changed-files/pull/1802
• chore(deps): lock file maintenance by @​renovate in https://github.com/tj-actions/changed-files/pull/1803
• chore(deps): update dependency eslint-plugin-prettier to v5.1.1 by @​renovate in https://github.com/tj-actions/changed-files/pull/1804
• fix: update safe output regex and the docs by @​tj-actions-bot in https://github.com/tj-actions/changed-files/pull/1805
• Revert "chore(deps): update actions/download-artifact action to v4" by @​jackton1 in https://github.com/tj-actions/changed-files/pull/1806
• Update README.md by @​jackton1 in https://github.com/tj-actions/changed-files/pull/1808
• chore(deps): lock file maintenance by @​renovate in https://github.com/tj-actions/changed-files/pull/1809
• Updated README.md by @​tj-actions-bot in https://github.com/tj-actions/changed-files/pull/1810

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

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