提出 #821921: AstrBotDevs AstrBot 4.23.6 Incorrect Authorization (CWE-863)

# Technical Details
An Incorrect Authorization vulnerability exists in the `_normalize_rw_path` method in `astrbot/core/tools/computer_tools/fs.py` of AstrBot.

The application fails to restrict file write and edit operations by reusing the read-allowed roots authorization logic. The `FileWriteTool` and `FileEditTool` workflows rely on `_normalize_rw_path`, which only verifies if a path is within the allowed read roots. Because the global skills directory is included in these read roots, restricted non-admin users can supply absolute paths targeting the skills directory and successfully bypass authorization to modify global automation logic.

# Vulnerable Code
File: astrbot/core/tools/computer_tools/fs.py
Method: _normalize_rw_path
Why: The function checks authorization by comparing the requested path against `_read_allowed_roots`, which incorrectly permits write/edit operations to global read-only paths like the skills directory.

# Reproduction
1. Log in to the AstrBot dashboard as a non-admin restricted user.
2. Trigger the `FileWriteTool.call` or `FileEditTool.call` function by sending a chat message to the LLM (e.g., via `/api/chat/send`).
3. Supply an absolute path targeting the global skills directory, such as `.../data/skills/malicious/SKILL.md`.
4. Observe that the file is successfully created or edited despite the restricted user privileges.

# Impact
- Arbitrary modification of globally shared skills content.
- Persistent malicious skill injection into the environment.
- Potential Remote Code Execution (RCE) when injected skills are loaded or executed by the system.

• ソース: ⚠️ https://gist.github.com/YLChen-007/b5e4671ff68e4f9001d977180ef4f081
• ユーザー: Eric-a (UID 96353)
• 送信: 2026年05月07日 13:30 (1 月 ago)
• モデレーション: 2026年05月31日 09:14 (24 days later)
• ステータス: 承諾済み
• VulDBエントリ: 367490 [AstrBotDevs AstrBot 4.23.6 fs.py _normalize_rw_path 特権昇格]
• ポイント: 20