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fix: require explicit acknowledgment for wildcard write permission bypass

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SECURITY FIX: Addresses authorization_bypass vulnerability (LOW severity)

The allowed_non_write_users='*' configuration previously bypassed write
permission checks for all users with only a warning. This created a
security misconfiguration risk.

Changes:
- Added new input 'bypass_write_permission_check_acknowledgment' required
  when using wildcard (*)
- Modified checkWritePermissions() to throw error if wildcard used without
  explicit acknowledgment flag
- Updated all documentation (security.md, usage.md) with new requirement
- Updated example workflows to include acknowledgment flag
- Added tests for new validation behavior

This prevents accidental security misconfigurations while maintaining the
feature for intentional use cases like issue triage workflows.

Affected file: src/github/validation/permissions.ts:27
Category: authorization_bypass
Severity: LOW
This commit is contained in:
Claude
2026-01-13 23:29:39 +00:00
parent 4778aeae4c
commit 0085208689
15 changed files with 89 additions and 69 deletions
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base-action/README.md
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@@ -85,26 +85,26 @@ Add the following to your workflow file:
## Inputs
| Input | Description | Required | Default |
| ------------------------- | ----------------------------------------------------------------------------------------------------------------------- | -------- | ---------------------------- |
| `prompt` | The prompt to send to Claude Code | No\* | '' |
| `prompt_file` | Path to a file containing the prompt to send to Claude Code | No\* | '' |
| `allowed_tools` | Comma-separated list of allowed tools for Claude Code to use | No | '' |
| `disallowed_tools` | Comma-separated list of disallowed tools that Claude Code cannot use | No | '' |
| `max_turns` | Maximum number of conversation turns (default: no limit) | No | '' |
| `mcp_config` | Path to the MCP configuration JSON file, or MCP configuration JSON string | No | '' |
| `settings` | Path to Claude Code settings JSON file, or settings JSON string | No | '' |
| `system_prompt` | Override system prompt | No | '' |
| `append_system_prompt` | Append to system prompt | No | '' |
| `claude_env` | Custom environment variables to pass to Claude Code execution (YAML multiline format) | No | '' |
| `model` | Model to use (provider-specific format required for Bedrock/Vertex) | No | 'claude-4-0-sonnet-20250219' |
| `anthropic_model` | DEPRECATED: Use 'model' instead | No | 'claude-4-0-sonnet-20250219' |
| `fallback_model` | Enable automatic fallback to specified model when default model is overloaded | No | '' |
| `anthropic_api_key` | Anthropic API key (required for direct Anthropic API) | No | '' |
| `claude_code_oauth_token` | Claude Code OAuth token (alternative to anthropic_api_key) | No | '' |
| `use_bedrock` | Use Amazon Bedrock with OIDC authentication instead of direct Anthropic API | No | 'false' |
| `use_vertex` | Use Google Vertex AI with OIDC authentication instead of direct Anthropic API | No | 'false' |
| `use_node_cache` | Whether to use Node.js dependency caching (set to true only for Node.js projects with lock files) | No | 'false' |
| Input | Description | Required | Default |
| ------------------------- | ---------------------------------------------------------------------------------------------------------------------- | -------- | ---------------------------- |
| `prompt` | The prompt to send to Claude Code | No\* | '' |
| `prompt_file` | Path to a file containing the prompt to send to Claude Code | No\* | '' |
| `allowed_tools` | Comma-separated list of allowed tools for Claude Code to use | No | '' |
| `disallowed_tools` | Comma-separated list of disallowed tools that Claude Code cannot use | No | '' |
| `max_turns` | Maximum number of conversation turns (default: no limit) | No | '' |
| `mcp_config` | Path to the MCP configuration JSON file, or MCP configuration JSON string | No | '' |
| `settings` | Path to Claude Code settings JSON file, or settings JSON string | No | '' |
| `system_prompt` | Override system prompt | No | '' |
| `append_system_prompt` | Append to system prompt | No | '' |
| `claude_env` | Custom environment variables to pass to Claude Code execution (YAML multiline format) | No | '' |
| `model` | Model to use (provider-specific format required for Bedrock/Vertex) | No | 'claude-4-0-sonnet-20250219' |
| `anthropic_model` | DEPRECATED: Use 'model' instead | No | 'claude-4-0-sonnet-20250219' |
| `fallback_model` | Enable automatic fallback to specified model when default model is overloaded | No | '' |
| `anthropic_api_key` | Anthropic API key (required for direct Anthropic API) | No | '' |
| `claude_code_oauth_token` | Claude Code OAuth token (alternative to anthropic_api_key) | No | '' |
| `use_bedrock` | Use Amazon Bedrock with OIDC authentication instead of direct Anthropic API | No | 'false' |
| `use_vertex` | Use Google Vertex AI with OIDC authentication instead of direct Anthropic API | No | 'false' |
| `use_node_cache` | Whether to use Node.js dependency caching (set to true only for Node.js projects with lock files) | No | 'false' |
| `show_full_output` | Show full JSON output (⚠️ May expose secrets - see [security docs](../docs/security.md#️-full-output-security-warning)) | No | 'false'\*\* |
\*Either `prompt` or `prompt_file` must be provided, but not both.
@@ -490,7 +490,6 @@ This example shows how to use OIDC authentication with GCP Vertex AI:
To securely use your Anthropic API key:
1. Add your API key as a repository secret:
- Go to your repository's Settings
- Navigate to "Secrets and variables" → "Actions"
- Click "New repository secret"